TECO VFD Fault Codes

OC: Over current (A510, A510s, F510, E510s)

What it means: The drive output current went above the overcurrent level, about 200% of the drive rated current, and the drive tripped.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. On the E510 and L510s, OC means Over-current during stop (separate row). E510s LCD text: Over Current.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Acceleration or deceleration time too short
• A contactor switching on the drive output side
• Special motor, or a motor bigger than the drive rating
• Short circuit or ground fault on the output

First checks, in this order

1. Extend the acceleration and deceleration times.
2. Check the motor wiring.
3. Disconnect the motor and try running the drive on its own.

OCA: Over current during acceleration

What it means: Overcurrent trip during acceleration: the output current went above the overcurrent level while the motor was speeding up.^{[2][3][4][5][9][10]}

Also on: Drives: A510s, F510, E510s. E510 and L510s show the same condition as OC-A.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Acceleration time too short
• Motor capacity bigger than the drive
• Short circuit between the motor winding and the motor frame
• Short circuit between a motor wire and ground
• Broken IGBT module

First checks, in this order

1. Set a longer acceleration time.
2. Use a drive with a bigger capacity if the motor is larger than the drive.
3. Examine the motor and check the wiring for shorts to ground.
4. If the motor and wiring are good, have the IGBT module checked and replaced.

OCC: Over current at constant speed

What it means: Overcurrent trip at constant speed: the output current went above the overcurrent level while the drive was running at a steady speed.^{[2][3][4][5][10]}

Also on: Drives: A510s, F510. E510s lists OCC with the same name, but its manuals repeat the OCA acceleration text in that row. E510 and L510s show this condition as OC-C.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Sudden change of load
• Sudden change of current

First checks, in this order

1. Use a drive with a bigger capacity.
2. Add a reactor on the power supply input.

OCd: Over current during deceleration

What it means: Overcurrent trip during deceleration: the output current went above the overcurrent level while the motor was slowing down.^{[2][3][4][5][9][10]}

Also on: Drives: A510s, E510s. F510 prints the same code as OCD. E510 and L510s show this condition as OC-d.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Deceleration time too short

First checks, in this order

1. Set a longer deceleration time.

SC: Short circuit

What it means: Short circuit or ground fault on the drive output (with ground fault detection 08-23 = 1).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Short circuit or ground fault in the motor circuit
• Damaged motor insulation
• Damaged or deteriorated motor cable

First checks, in this order

1. Check the motor wiring.
2. Disconnect the motor and try running the drive on its own.

GF: Ground fault (A510, A510s, F510, E510s)

What it means: The current to ground went above 50% of the drive rated output current. Active only when the ground fault function is enabled (08-23 = 1).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. E510 has its own GF row (Output side ground Fault, enabled by 08-18).

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Damaged motor insulation
• Damaged or deteriorated motor cable
• Faulty DCCT current sensors in the drive

First checks, in this order

1. Check the resistance between the motor cables and ground.
2. Check the motor wiring; replace the motor if its insulation has failed.
3. Disconnect the motor and try running the drive on its own.
4. Reduce the carrier frequency.

GF: Output side ground Fault (E510)

What it means: With ground fault detection enabled by 08-18, any short circuit to ground on the output switches the drive output off.^[6][7][8]

Also on: Drives: E510.

Drive response: Can be reset manually but not by auto restart

Likely causes

• Motor winding failure to ground
• Motor cable shorted to ground

First checks, in this order

1. Check the motor winding resistance for failures.
2. Check the motor cable for a short to ground.
3. If both are good, consult the supplier.

OV: Over voltage

What it means: The DC bus voltage went above the overvoltage level: 410 Vdc on 200V class and 820 Vdc on 400V class drives (A510s also 1050 Vdc on 575V class and 1230 Vdc on 690V class). On 400V class drives with input voltage 01-14 set below 400 V the level drops to 700 Vdc (730 Vdc in the F510 fault table).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. OV (flash) is the warning form of the same condition on these drives: the drive keeps running. E510 and L510s show OV-C during operation and -OV- when stopped.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Deceleration time too short, so regenerative energy flows back from the motor into the drive
• Input voltage too high
• Power factor correction capacitors on the supply
• Excessive braking load
• Faulty braking transistor or braking resistor
• Speed search parameters set wrongly

First checks, in this order

1. Increase the deceleration time.
2. Bring the input voltage within the drive rating, or install an AC line reactor to lower it.
3. Remove power factor correction capacitors.
4. Use a dynamic braking unit; replace a faulty braking transistor or resistor.
5. Adjust the speed search parameters.

UV: Under voltage

What it means: The DC bus voltage fell below the undervoltage level, or the pre-charge contactor is not active while running. Levels: 190 Vdc on 200V class, 380 Vdc on 400V class, 546 Vdc on 575V and 690V class (A510s); adjustable with 07-13.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510. UV (flash) is the warning form on A510, A510s, F510 and E510s. E510s prints the fault form as LV (Low Voltage).

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Input voltage too low
• Input phase loss
• Acceleration time too short
• Input voltage fluctuation
• Damaged pre-charge contactor
• Wrong DC bus voltage feedback signal

First checks, in this order

1. Check the input voltage and the input wiring.
2. Check the power source.
3. Increase the acceleration time.
4. Replace the pre-charge contactor if it has failed.
5. If the supply is good, replace the control board or the drive.

LV: Low Voltage

What it means: E510s undervoltage trip: the DC bus voltage fell below 190 Vdc (200V class) or 380 Vdc (400V class), or the pre-charge contactor is not active while running. Level adjustable with 07-13.^[9][10]

Also on: Drives: E510s. E510 and L510s use LV-C (during operation) and -LV- (when stopped).

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Input voltage too low
• Input phase loss
• Acceleration time too short
• Input voltage fluctuation
• Damaged pre-charge contactor

First checks, in this order

1. Check the input voltage and the input wiring.
2. Check the power source.
3. Increase the acceleration time.
4. Replace the pre-charge contactor, the control board or the drive if the supply is good.

IPL: Input phase loss

What it means: Phase loss on the drive input side, or input voltage imbalance. Active when 08-09 = 1 (enabled).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. E510 and L510s show input phase loss as PF.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Loose wiring on the drive input terminals (R/L1, S/L2, T/L3)
• Momentary power loss
• Input voltage imbalance between phases or large input voltage fluctuation
• Aging of the main circuit capacitors inside the drive (F510)

First checks, in this order

1. Check the input wiring and tighten the terminal screws.
2. Check the power supply on all phases.
3. On F510, make sure the input voltage is stable or turn off IPL detection.
4. If the supply and wiring are good, replace the circuit board or the drive (F510).

OPL: Output phase loss

What it means: Phase loss on the drive output side. Active when 08-10 = 1 (enabled).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. E510 shows output phase loss as LF.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Loose wiring on the drive output terminals
• Motor rated current below 10% of the drive rated current

First checks, in this order

1. Check the output wiring and tighten the terminal screws.
2. Check that the motor and drive ratings match.

OH1: Heatsink overheat

What it means: The heatsink temperature is too high.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. E510 and L510s show OH-C (overheated during running) and -OH- (overheated when stopped).

Drive response: Fault; if OH1 occurs three times within five minutes, wait 10 minutes before resetting

Likely causes

• Ambient temperature too high
• Cooling fan failed
• Carrier frequency set too high
• Load too heavy

First checks, in this order

1. Cool the surroundings with a fan or air conditioning.
2. Check and replace the cooling fan; clean dust and dirt from the heatsink.
3. Reduce the carrier frequency.
4. Reduce the load and measure the output current.

OH4: Motor overheating (F510, E510s)

What it means: Motor overheating: the motor PTC input went above the overheat protection level (08-42 on E510s).^{[4][5][9][10]}

Also on: Drives: F510, E510s. L510s also has OH4 with its own settings (separate row).

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Motor surroundings too hot
• Motor PTC signal above the protection level

First checks, in this order

1. Check the temperature around the motor.
2. Check the wiring on the MT and GND terminals.

OH4: Motor over heat error (L510s)

What it means: Motor over heat detection: the temperature signal rose above the limit in 08-13 for the delay in 08-12, so the motor coasts to stop. OH4 can be reset when the signal is back below the PTC reset level in 08-14.^[11][12]

Also on: Drives: L510s.

Drive response: Can be reset manually but not by auto restart; reset once the temperature is below 08-14

Likely causes

• Motor temperature above the set limit
• Poor motor ventilation

First checks, in this order

1. Improve the ventilation of the motor.
2. Adjust parameter 08-15 as TECO suggests.

OL1: Motor overload

What it means: The drive's internal motor overload protection tripped (on the A510 family active when protection curve 08-05 = xxx1).^{[1][2][3][4][5][6][8][9][10][11][12]}

Also on: Drives: A510, A510s, F510, E510s, E510, L510s.

Drive response: A510 family: fault; with 08-06 = 1 (A510s, F510) the drive keeps running and OL1 flashes as an alarm until the current is back in range. E510 and L510s: manual reset only, no auto restart

Likely causes

• V/F voltage set too high, over-exciting the motor
• Motor rated current (02-01) set wrongly
• Load too heavy

First checks, in this order

1. Check the V/f curve.
2. Check the motor rated current setting against the motor nameplate.
3. Check and reduce the motor load and the duty cycle.
4. On E510 and L510s, TECO suggests a larger motor capacity if the load is simply too large.

OL2: Inverter overload

What it means: The drive's own thermal overload protection tripped.^{[1][2][3][4][5][6][8][9][10][11][12]}

Also on: Drives: A510, A510s, F510, E510s, E510, L510s. L510s: after CL or OL2 four successive times, wait 5 minutes to reset.

Drive response: Fault; if it occurs four times in five minutes, wait 4 minutes before resetting (A510 family). E510 and L510s: manual reset only

Likely causes

• V/F voltage set too high, over-exciting the motor
• Drive rating too small for the load
• Load too heavy

First checks, in this order

1. Check the V/f curve.
2. Check and reduce the motor load and the duty cycle.
3. Use a drive with a larger rating.

OT: Over torque detection

What it means: Output torque stayed above the over torque detection level (08-15) for the time in 08-16. Enabled with 08-14 (08-14 = 0 or 2 on F510).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. OT (flash) is the warning form. E510 shows over torque as OL3.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Load too heavy

First checks, in this order

1. Check the over torque detection settings 08-15 and 08-16.
2. Check and reduce the motor load and the duty cycle.

UT: Under torque detection

What it means: Output torque stayed below the under torque detection level (08-19) for the time in 08-20. Enabled with 08-18.^{[1][2][3][4][5]}

Also on: Drives: A510, A510s, F510. UT (flash) is the warning form.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Sudden drop in load
• Broken belt

First checks, in this order

1. Check the under torque detection settings 08-19 and 08-20.
2. Check the load and the application, for example the belt.

CE: Communication error

What it means: No Modbus communication was received for the time set in 09-06. Trips when 09-07 = 0 to 2; with 09-07 = 3 it is a flashing warning after 2 seconds without communication.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. E510s LCD text: Comm. Error. E510 and L510s show COt (Communication error).

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Connection lost or wire broken
• Host stopped communicating

First checks, in this order

1. Check the communication connection and cable.
2. Check the host computer or PLC and its software.

FB: PID feedback loss

What it means: The PID feedback signal fell below the loss level in 10-12 for the time in 10-13. Trips when 10-11 = 2; with 10-11 = 1 it shows as FB (flash), a warning.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Feedback signal wire broken
• Feedback sensor broken

First checks, in this order

1. Check the feedback wiring.
2. Replace the feedback sensor.

STO: Safety switch

What it means: The safety (run permissive) inputs are open, so the drive output is off.^{[1][2][3][4][5]}

Also on: Drives: A510, A510s, F510.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Terminals F1 and F2 not connected (standard H and C types)
• Terminals SF1 or SF2 and SG not connected (enhanced E and G types)
• 08-30 set to 1 (coast to stop) and the digital input set to 58 is open

First checks, in this order

1. Check the F1 and F2 connection on standard types.
2. Check the SF1, SF2 and SG connection on enhanced types.
3. Check 08-30 and the digital input set to 58 (03-00 to 03-07).

PO: Voltage Off (STO terminal 1)

What it means: STO terminal 1 error on E510s models without the STO/filter option. Models with STO/filter show Safety 1 Error (STO 1) for the same condition.^[9][10]

Also on: Drives: E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Terminals SF1 and SG not connected

First checks, in this order

1. Check the SF1 and SG connection.

PO2: Voltage Off (STO terminal 2)

What it means: STO terminal 2 error on E510s models without the STO/filter option. Models with STO/filter show Safety 2 Error (STO2).^[9][10]

Also on: Drives: E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Terminals SF2 and SG not connected

First checks, in this order

1. Check the SF2 and SG connection.

PO3: Voltage Off (STO terminal 3)

What it means: STO terminal 3 error on E510s models without the STO/filter option. Models with STO/filter show Safety 3 Error (STO3).^[9][10]

Also on: Drives: E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Transformer voltage output of the drive is not stable

First checks, in this order

1. Replace the power board.
2. Contact TECO.

EF0: External fault 0

What it means: External fault sent over Modbus: register 0x2501 bit 2 = 1.^{[2][3][4][5][9][10]}

Also on: Drives: A510s, F510, E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Host or PLC set the external fault bit (0x2501 bit 2)

First checks, in this order

1. Find why the host set the fault, then reset bit 2 of Modbus register 0x2501.

EF1: External fault (S1)

What it means: External fault on digital input S1 (input set to 25, or 68 on A510s and newer F510, with external fault selection 08-24 = 0 or 1).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. EF2 to EF8 are the same fault on inputs S2 to S8 (up to EF8 on A510 and A510s, up to EF6 on F510 and E510s). With 08-24 = 2 the drive keeps running and EF1 to EF8 flash as warnings.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• The external device wired to S1 signalled a fault
• Multi-function input function set wrongly

First checks, in this order

1. Check the device that drives S1 and find the fault reason.
2. Check the wiring and the input function setting.
3. Reset the external fault on the digital input.

CF07: Motor control fault (SLV)

What it means: Motor control fault: in sensorless vector (SLV) mode the drive is unable to run the motor.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• SLV mode cannot control the motor with the present motor data

First checks, in this order

1. Perform a rotational or stationary auto-tune.
2. Increase the minimum output frequency (01-08).

CF08: Motor control fault (PMSLV)

What it means: Motor control fault: start or run fault in PM sensorless (PMSLV) mode.^{[2][3][4][5][9][10]}

Also on: Drives: A510s, F510, E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Start or run failure of the PM motor in PMSLV mode
• Load too heavy for the torque output limit

First checks, in this order

1. Increase 22-10 (and 22-23 on A510s and E510s) step by step.
2. Repeat the auto-tune (22-21).
3. Check whether the load is too heavy, and raise the torque output limit if needed.

FU: Fuse open

What it means: The DC bus fuse is open. Fitted on larger ratings: 200V class 50HP and above, 400V class 75HP and above.^[1][3][4]

Also on: Drives: A510, A510s, F510.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Damaged IGBT
• Short circuit on the output terminals

First checks, in this order

1. Check the IGBTs.
2. Check for a short circuit at the drive output.
3. Replace the drive.

CF00: Operator Communication Error

What it means: The keypad and the drive could not exchange data within 5 seconds after power on.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. A510 marks CF00 and CF01 as LCD keypad only; with the LED keypad the display freezes instead.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Keypad not communicating with the drive after power up

First checks, in this order

1. Disconnect the keypad and reconnect it.
2. If it stays, replace the control board.

CF01: Operator Communication Error 2

What it means: The keypad and the drive can exchange data, but a transmission error lasted more than 2 seconds.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Keypad link interrupted while running

First checks, in this order

1. Disconnect the keypad and reconnect it.
2. If it stays, replace the control board.

CTER: CT Failure

What it means: Error detecting the voltages from the three phase current transformers that measure output current.^[2][3]

Also on: Drives: A510s. F510 lists a CT Fault with the same checks but prints no code for it. E510 and L510s use CtEr (Current Sensor detection error).

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Voltage detection error
• Too much electrical noise
• Control board failure

First checks, in this order

1. Check the current transformer signals and the voltage on the control board.

CF20: Communication Failure

What it means: Profibus and Modbus communication are being used at the same time.^[2][3]

Also on: Drives: A510s. F510 lists the same condition as Double Communication Error without a printed code.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Two communication types in use at once

First checks, in this order

1. Make sure only one communication type is used.

PF: Protection Fault (A510s, F510, E510s)

What it means: Protection fault: OH1 has occurred three times in five minutes while the run command on the digital inputs was not removed (E510s: OH1 or OL2 three times in five minutes, run command from digital input or communication not removed).^{[2][4][5][9][10]}

Also on: Drives: A510s, F510, E510s. On E510 and L510s, PF means Input phase Loss (separate row). E510s names it Protection Error.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Run command left on after repeated OH1 (or OL2) trips

First checks, in this order

1. Remove the run command from the digital input or communication.
2. Then fix the cause of the repeated OH1 or OL2 trips (see those rows).

TOL: External Overload

What it means: External overload signal on a digital input, for example fan overheat. Enabled only when fire mode is active.^{[2][4][5][9][10]}

Also on: Drives: A510s, F510, E510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• External overload input active

First checks, in this order

1. Check the external overload device.
2. Reset the external overload digital input.

OS: Over speed

What it means: Motor speed stayed above the PG over speed level (20-20) for the time in 20-21. Active when 20-19 = 0 or 1, in V/F + PG and SV control modes (00-00 = 1, 3 or 4). Motor speed can be read in 12-22.^[1][2][3]

Also on: Drives: A510, A510s. OS (flash) is the warning form.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Motor speed overshoot (speed regulator ASR)
• PG pulses per revolution set wrongly
• Overspeed parameters set wrongly

First checks, in this order

1. Check the ASR parameters in group 21.
2. Check the PG parameters.
3. Check the overspeed level (20-20) and time (20-21).

PGO: PG Open circuit

What it means: The drive received no encoder (PG) pulses for the time in 20-26. Active in V/F + PG and SV control modes (00-00 = 1, 3 or 4).^[1][2][3]

Also on: Drives: A510, A510s. PGO (flash) is the warning form.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• PG cable disconnected
• PG has no power
• Mechanical brake holding the motor

First checks, in this order

1. Check the PG wiring.
2. Check the PG power supply.
3. Make sure the brake is released.

DEV: Speed deviation

What it means: Speed deviation stayed above the level in 20-23 for the time in 20-24. Active when 20-22 = 0 or 1, in V/F + PG and SV control modes.^[1][2][3]

Also on: Drives: A510, A510s. DEV (flash) is the warning form.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Load too heavy
• Mechanical brake holding the motor
• PG wiring error
• PG parameters (group 20) set wrongly
• Acceleration or deceleration time too short

First checks, in this order

1. Check the load.
2. Make sure the brake is released.
3. Check the PG wiring and parameters 20-23 and 20-24.
4. Increase the acceleration and deceleration times.

FBLSS: PID Feedback Signal Loss

What it means: Pressure loss detection: with 23-19 above 0, the feedback pressure stayed below the pressure setting times the loss proportion (23-19) for the detection time in 23-18, with 23-78 = 2.^{[4][5][9][10][12]}

Also on: Drives: F510, E510s, L510s. L510s lists FBLSS among faults that reset manually or automatically.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Loss pressure proportion 23-19 enabled and set too high
• Feedback sensor not working or not installed correctly

First checks, in this order

1. Check that 23-19 is set correctly.
2. Make sure the feedback sensor is installed correctly and the PID feedback signal works.

OPR: Disconnection

What it means: The run command comes from the keypad (00-02 = 0) and the keypad was disconnected or removed while running. 16-09 decides whether the drive stops or shows the fault.^{[4][5][9][10]}

Also on: Drives: F510, E510s. E510s names it Operator Disconnection.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Keypad removed or its cable disconnected during operation

First checks, in this order

1. Check that the keypad is connected and seated.

run: Switch for Motor1/Motor2

What it means: A command to switch between motor 1 and motor 2 was given while the drive was running.^{[2][3][9][10]}

Also on: Drives: A510s, E510s. E510s names it Motor1/Motor2 Switch.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Motor 2 switch command executed during operation

First checks, in this order

1. Change the control sequence so the motor is switched only when the drive is stopped.

LPBFT: Low pressure fault

What it means: Pump application: the pressure feedback is below the minimum pressure limit (23-15; 14-15 on L510s).^{[4][5][9][10][12]}

Also on: Drives: F510, E510s, L510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Feedback signal not connected
• Pump pressure feedback below the minimum limit

First checks, in this order

1. Check that the feedback signal is correct and connected.
2. Check the pressure against the minimum pressure limit (23-15, or 14-15 on L510s).

OPBFT: High pressure fault

What it means: Pump application fault tied to the maximum pressure limit (23-12; 14-12 on L510s).^{[4][5][9][10][12]}

Also on: Drives: F510, E510s, L510s.

Drive response: Fault: fault relay energizes and the motor coasts to stop; fix the cause, then reset with the RESET key or a digital input set to 17 (Fault reset); A510, A510s and F510 manuals also allow a power cycle until the keypad goes blank

Likely causes

• Pump pressure feedback past the maximum pressure limit
• Wrong or faulty feedback signal

First checks, in this order

1. Check that the feedback signal is correct.
2. Check the pressure feedback against the maximum pressure limit (23-12, or 14-12 on L510s).

CLB: Over current protection level B

What it means: The drive current has reached current protection level B.^{[1][2][3][4][5][9]}

Also on: Drives: A510, A510s, F510. E510s lists it as Over current protection level B (LCD text). The A510 manual also lists CLB in its fault table as Current Protection Level B.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Drive current too high
• Load too heavy

First checks, in this order

1. Check the load and the duty cycle.

OH2: Inverter over heating warning

What it means: Overheat warning from a digital input set to the overheat warning function (03-00 to 03-07 = 31).^{[1][2][3][4][5]}

Also on: Drives: A510, A510s, F510.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• External overheat warning input active
• Multi-function input function set wrongly

First checks, in this order

1. Check the device and wiring on that input.
2. Check the input function setting.

OH3: Motor over Heating warning

What it means: Motor overheat warning from the PTC input: the PTC level is above the warning level (08-43 on E510s; on L510s with 08-10 = 3, the AVI signal above 08-15). The motor keeps running.^{[9][10][11][12]}

Also on: Drives: E510s, L510s.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Motor temperature signal above the warning level
• Input function or PTC wiring set wrongly

First checks, in this order

1. Check the PTC wiring and the input function setting.
2. Check the warning level setting (08-43 on E510s, 08-15 on L510s).

bb1: External baseblock

What it means: External baseblock input on terminal S1 is active, so the drive output is blocked.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. bb2 to bb8 are the same for inputs S2 to S8 (up to bb6 on F510 and E510s). E510 and L510s show b.b.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Baseblock input switched on by external equipment
• Multi-function input function set wrongly

First checks, in this order

1. Check the device and wiring on the input.
2. Check the input function setting.

EF9: Error of forward/reversal rotation

What it means: Forward run and reverse run commands came on within 0.5 seconds of each other. The stop method follows 07-09.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Forward and reverse run both active (2-wire control)

First checks, in this order

1. Check the run command wiring.

Retry: Retry

What it means: Automatic reset is active; the warning stays until the restart delay in 07-01 has passed.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• 07-01 (restart delay) and 07-02 (number of restarts) set above 0 after a trip

First checks, in this order

1. Nothing to do if auto restart is wanted: the warning disappears after the automatic reset.
2. If auto restart is not wanted, set 07-01 or 07-02 back to 0.

ES: External emergency stop

What it means: External emergency stop is active (a digital input set to 14 is on).^{[2][3][9][10]}

Also on: Drives: A510s, E510s. E510 and L510s show E.S. F510 lists it as External Emergency Stop without a printed code.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Emergency stop input switched on

First checks, in this order

1. Turn off the run command and remove the external emergency stop command.

SE01: Rang setting error

What it means: A parameter is outside its allowed range because it depends on another parameter (for example 02-00 above 02-01, or 00-12 below 00-13).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. Printed as Rang setting error in the A510, A510s and F510 manuals; the F510 quick setting manual prints Range setting error.

Drive response: Self-diagnosis: code flashes and the drive will not accept a run command until the setting is corrected; fault relay does not energize

Likely causes

• A parameter changed so that a dependent setting is now out of range

First checks, in this order

1. Check the parameter settings and correct the conflicting pair.

SE02: Digital input terminal error

What it means: Multi-function digital input setting error.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s.

Drive response: Self-diagnosis: code flashes and the drive will not accept a run command until the setting is corrected; fault relay does not energize

Likely causes

• Two or more inputs set to the same function (except external fault and not used)
• UP and DOWN commands not both set (they must be used together)
• UP/DOWN and ACC/DEC commands set at the same time
• Speed search 1 and speed search 2 set at the same time
• 2-wire and 3-wire sequence set at the same time

First checks, in this order

1. Check the multi-function input settings (03-00 to 03-07).

SE03: V/f curve error

What it means: V/f curve setting error: the frequencies are not in the required order 01-02 (Fmax) > 01-12 (Fbase) > 01-06 (Fmid1) > 01-08 (Fmin).^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s.

Drive response: Self-diagnosis: code flashes and the drive will not accept a run command until the setting is corrected; fault relay does not energize

Likely causes

• V/F curve points set out of order

First checks, in this order

1. Check the V/F parameters.

HPErr: Model selection error (A510, A510s, F510, E510s)

What it means: Inverter capacity setting error: the capacity set in 13-00 does not match the rated voltage.^{[1][2][3][4][5][9][10]}

Also on: Drives: A510, A510s, F510, E510s. On L510s, HPErr is a fault that cannot be recovered manually (separate row).

Drive response: Self-diagnosis: code flashes and the drive will not accept a run command until the setting is corrected; fault relay does not energize

Likely causes

• 13-00 does not match the drive voltage class

First checks, in this order

1. Check the inverter capacity setting 13-00.

USP: Unattended Start Protection

What it means: Unattended Start Protection is enabled at power up through a digital input (function 50); the drive will not accept a run command.^{[1][2][3][4][5]}

Also on: Drives: A510, A510s, F510.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• USP input active at power up with a run command present

First checks, in this order

1. Remove the run command, or reset with a digital input set to 17 or the RESET key.
2. Activate the USP input and re-apply power.

AtErr: Auto-tuning Error

What it means: A fault occurred during auto-tuning of a standard AC motor and the motor stopped. The error number (01 to 09) is shown in 17-11. The fault relay does not energize.^{[1][2][3][4][5]}

Also on: Drives: A510, A510s, F510. PM motor tuning faults show IPErr with the number in 22-18. E510 shows AtEr.

Drive response: Motor stops; fault relay does not energize

Likely causes

• Motor data entered wrongly (17-00 to 17-09) or drive current not matching the motor
• Tuning not completed in time, results out of range, or motor rated current exceeded
• Motor disconnected
• Motor failed to accelerate in time (rotational tuning)

First checks, in this order

1. Check the motor tuning data 17-00 to 17-09 against the nameplate.
2. Check the motor connection and disconnect the motor load.
3. Increase the acceleration time (00-14) for rotational tuning.
4. Read 17-11 for the error number and follow its row in the manual.

FirE: Fire mode enabled

What it means: Fire mode is enabled.^{[2][3][9][10]}

Also on: Drives: A510s, E510s. E510 shows FIrE (Fire Mode): the drive runs at full speed and FIrE is recorded in the fault log. F510 shows FIRE (Fire override mode).

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Fire mode input or setting active

First checks, in this order

1. Check the environment and confirm the fire status.
2. If no fire is present, turn the power off and on again.

EPErr: EEPROM Save error

What it means: The data saved in the EEPROM is wrong.^{[2][3][9][10]}

Also on: Drives: A510s, E510s. F510 lists EEPROM Archiving Error without a printed code. E510 and L510s use EPr.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• EEPROM circuit failure
• Parameter check error at power on

First checks, in this order

1. Restore the factory settings, then switch the power off and on.
2. If the warning comes back, replace the control board.

-OV-: Voltage too high when stopped

What it means: High DC bus voltage detected while the drive is stopped.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• Detection circuit malfunction

First checks, in this order

1. Consult the supplier.

-LV-: Voltage too low when stopped

What it means: Low voltage detected while the drive is stopped.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• Supply voltage too low
• Pre-charge resistor or fuse burnt out
• Detection circuit malfunction

First checks, in this order

1. Check that the supply voltage is correct.
2. Have the pre-charge resistor or fuse replaced.
3. If it stays, consult the supplier.

-OH-: The inverter is overheated when stopped

What it means: Overheat detected while the drive is stopped.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• Detection circuit malfunction
• Ambient temperature too high or poor ventilation

First checks, in this order

1. Improve the ventilation; if that does not help, replace the drive.

OH-C: The inverter is overheated during running

What it means: Overheat detected while the drive is running.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• IGBT temperature too high or poor ventilation
• Temperature sensor error or circuit malfunction

First checks, in this order

1. Reduce the carrier frequency.
2. Improve the ventilation; if that does not help, replace the drive.

OC-A: Over-current at acceleration

What it means: Overcurrent trip while the motor is accelerating.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Can be reset manually or by auto restart (07-01 delay, 07-02 attempts)

Likely causes

• Acceleration time too short
• Motor capacity larger than the drive
• Short circuit between the motor coil and the motor case
• Short circuit between the motor wiring and ground
• Damaged IGBT module

First checks, in this order

1. Set a longer acceleration time.
2. Use a drive rated for the motor.
3. Check the motor and the wiring.
4. If they are good, consult the supplier.

OC-C: Over-current at fixed speed

What it means: Overcurrent trip while running at a fixed speed.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Can be reset manually or by auto restart (07-01 delay, 07-02 attempts)

Likely causes

• Sudden load change
• Sudden power change

First checks, in this order

1. Use a drive with a larger capacity.
2. Install an inductor (reactor) on the power supply input.

OC-d: Over-current at deceleration

What it means: Overcurrent trip while the motor is decelerating.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Can be reset manually or by auto restart (07-01 delay, 07-02 attempts)

Likely causes

• Deceleration time too short

First checks, in this order

1. Set a longer deceleration time.

OC-S: Over current at start

What it means: Overcurrent detected at start.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Can be reset manually or by auto restart (07-01 delay, 07-02 attempts)

Likely causes

• Short circuit between the motor coil and the motor case
• Short circuit between the motor coil and ground
• Damaged IGBT module

First checks, in this order

1. Inspect the motor.
2. Inspect the wiring.
3. If both are good, consult the supplier.

OV-C: Excessive Voltage during operation/ deceleration

What it means: DC bus voltage too high during operation or deceleration.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Can be reset manually or by auto restart (07-01 delay, 07-02 attempts)

Likely causes

• Deceleration time too short or high load inertia
• Supply voltage fluctuating widely

First checks, in this order

1. Set a longer deceleration time.
2. Add a braking resistor or braking module (on L510s for 400V models and 200V 5hp to 15hp models).
3. Add a reactor on the power input side.

PF: Input phase Loss (E510, L510s)

What it means: Input phase loss: abnormal fluctuations in the main circuit voltage.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. On A510s, F510 and E510s, PF means Protection Fault (separate row); input phase loss there is IPL.

Drive response: Can be reset manually or by auto restart (07-01 delay, 07-02 attempts)

Likely causes

• Main power wiring fault or a missing phase
• Unstable supply voltage

First checks, in this order

1. Check the main circuit power supply wiring.
2. Check the supply voltage.

ud-C: Output under current detection

What it means: The output current fell below the output under current detection level.^[6][7][8]

Also on: Drives: E510.

Drive response: Can be reset manually or by auto restart (07-01 delay, 07-02 attempts)

Likely causes

• Output current below the set under current level (light load, lost load)

First checks, in this order

1. Set the under current detection level to suit the application.

LF: Output phase loss

What it means: Loss of output voltage on one of the phases.^[6][7][8]

Also on: Drives: E510.

Drive response: Can be reset manually or by auto restart (07-01 delay, 07-02 attempts)

Likely causes

• Output cable connection fault
• Loose output terminals

First checks, in this order

1. Check the output cable connections.
2. Measure the resistance between the motor lines.
3. Check whether the terminals are loose.

OC: Over-current during stop (E510, L510s)

What it means: Overcurrent detected while the drive is stopped.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. On A510, A510s, F510 and E510s, OC is the running overcurrent trip (separate row).

Drive response: Can be reset manually but not by auto restart

Likely causes

• Detection circuit malfunction

First checks, in this order

1. Consult the supplier.

OL3: Over torque

What it means: Over torque detected.^[6][7][8]

Also on: Drives: E510. A510, A510s, F510 and E510s show over torque as OT.

Drive response: Can be reset manually but not by auto restart

Likely causes

• Load too large
• Over torque settings 08-15 and 08-16 too small

First checks, in this order

1. Use a drive with a larger capacity.
2. Set 08-15 and 08-16 to suit the load.

LV-C: Voltage too low during operation

What it means: Supply voltage too low while running.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Can be reset manually but not by auto restart

Likely causes

• Supply voltage too low
• Supply voltage fluctuating widely

First checks, in this order

1. Improve the power quality.
2. Add a reactor on the power input side.

OVSP: Motor rotating too fast

What it means: The actual motor speed differs widely from the set speed.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. L510s names it motor rotation over speed.

Drive response: Can be reset manually but not by auto restart

Likely causes

• Load too large
• Wrong speed setting or frequency setting signal

First checks, in this order

1. Check for excessive load.
2. Check that the set speed and the frequency setting signal are correct.

CtEr: Current Sensor detection error

What it means: Current sensor detection error.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• Current sensor error or circuit malfunction

First checks, in this order

1. Consult the supplier.

CdEr: OC, CL circuit detection error

What it means: The OC and CL (overcurrent and current limit) detection circuit has malfunctioned.^[7][8]

Also on: Drives: E510. Listed in the E510 manual V08 and the E510 quick setting manual V11.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• OC and CL detection circuit malfunction

First checks, in this order

1. Return the drive for repair.

Err4: CPU Illegal interrupt

What it means: Illegal interrupt in the drive CPU.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. L510s names it CPU Unusual interruption.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• External electrical noise

First checks, in this order

1. Remove the noise source, then restart by switching the power off and on.
2. If it happens often, consult the supplier.

r-OFF: Power relay off error

What it means: The power relay is off when it should be on.^[6][7][8]

Also on: Drives: E510.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• Power relay or its circuit broken

First checks, in this order

1. Consult the supplier.

EPr: EEPROM problem

What it means: EEPROM problem.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• Faulty EEPROM

First checks, in this order

1. Consult the supplier.

COt: Communication error

What it means: Communication error: the communication link was disrupted.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• Communication disruption

First checks, in this order

1. Check the communication wiring.

HPErr: Inverter capacity setting error (L510s)

What it means: The inverter capacity setting (13-00) does not match the hardware voltage level.^[11][12]

Also on: Drives: L510s. On A510, A510s, F510 and E510s, HPErr is a self-diagnosis code (Model selection error).

Drive response: TECO lists it as a fault that cannot be recovered manually; if it stays, consult the supplier

Likely causes

• 13-00 set to a capacity of another voltage class

First checks, in this order

1. Set 13-00 to match the hardware voltage level of the drive.

CL: Inverter over current

What it means: Inverter over current warning: the drive current reached the over current protection level.^[11][12]

Also on: Drives: L510s.

Drive response: Can be reset manually but not by auto restart

Likely causes

• Drive current at the protection level (heavy load or long running period)

First checks, in this order

1. Check the load condition and the running period.
2. Wait 1 minute before resetting; after CL or OL2 four successive times, wait 5 minutes.

LIFE3: Main Circuit Capacitor life expectancy alarm

What it means: Life expectancy alarm for the main circuit capacitors.^[6][7][8]

Also on: Drives: E510. E510 also has LIFE1 (inrush current suppression circuit) and LIFE2 (control circuit capacitor) life expectancy alarms, both answered with: consult the supplier.

Drive response: Can be reset manually but not by auto restart

Likely causes

• Main circuit capacitor damaged or at end of life

First checks, in this order

1. Consult the supplier.

AtEr: Auto tuninig error

What it means: Auto-tuning error.^[6][7][8]

Also on: Drives: E510. Name printed as Auto tuninig error. A510, A510s and F510 show AtErr.

Likely causes

• Motor nameplate data entered wrongly
• Emergency stop activated during auto-tuning

First checks, in this order

1. Check the motor nameplate data entered for tuning.
2. Make sure no emergency stop is active, then tune again.

b.b.: External base block

What it means: External base block input is active: the drive stops its output immediately and the display flashes b.b.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. A510, A510s, F510 and E510s show bb1 to bb8.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Base block input switched on

First checks, in this order

1. Check the external device and wiring on the base block input.

E.S.: External Rapid stop

What it means: External rapid stop input is active: the drive decelerates to stop and the display flashes E.S.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. A510s and E510s show ES.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Rapid stop input switched on

First checks, in this order

1. Remove the external rapid stop command, then restart.

StP0: Zero speed at stop

What it means: Zero speed stop: the frequency command is too low (E510: below 0.1 Hz; L510s V/f mode: below 1.3 Hz with 50 Hz set or 1.5 Hz with 60 Hz set, SLV mode below 1 Hz).^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. A510s prints STP0 Zero Speed Stop Error: frequency command below 01-08 without DC brake.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Frequency command below the minimum

First checks, in this order

1. Adjust the frequency command.

StP1: Fail to start directly

What it means: At power up in external terminal control (00-02 or 00-03 = 1) with direct start disabled (07-04 = 1) and the run input already on, the drive will not start and flashes StP1.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. A510s and E510s print STP1 Direct start warning; F510 lists Warning of Direct Start (re-apply the run input after the 07-05 delay).

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• Run input active at power up with 07-04 = 1

First checks, in this order

1. Remove the run command from the terminal, then switch it on again.
2. See 07-04 if the drive should start directly.

StP2: Keypad Stop Operated when inverter in external Control mode

What it means: The keypad STOP key was pressed while the drive runs from external terminals (00-02 or 00-03 = 1); StP2 flashes after the stop.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s. A510s prints STP2 External Terminal Stop Error; E510s and F510 list External Terminal Stop Error.

Drive response: Warning: code flashes, fault relay does not energize and the drive keeps running; clears when the condition is gone

Likely causes

• STOP key pressed in external control mode

First checks, in this order

1. Release the run contact and switch it on again to restart.

LOC: Parameter already locked

What it means: Keypad operation refused: parameters locked, motor direction locked, or parameter password (13-07) enabled.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Keypad operation error; drive keeps its state

Likely causes

• Frequency change attempted while 13-06 is above 0
• Reverse attempted while 11-00 = 1
• Password (13-07) enabled

First checks, in this order

1. Adjust 13-06 to unlock parameters.
2. Adjust 11-00 to allow reverse.
3. Enter the correct password in 13-07.

Err1: Keypad operation error

What it means: The keypad action is not allowed in the present state.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Keypad operation error

Likely causes

• UP or DOWN pressed while 00-05 or 00-06 is above 0, or while running at preset speed
• Trying to change a parameter that cannot be changed during operation

First checks, in this order

1. Use UP or DOWN for the frequency only when 00-05 or 00-06 = 0.
2. Change that parameter in STOP mode.

Err2: Parameter setting error

What it means: The new parameter value conflicts with other settings.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Keypad operation error

Likely causes

• 00-13 inside a skip frequency band (11-08 to 11-10 plus or minus 11-11)
• 00-12 not above 00-13
• 00-05 and 00-06 (or 10-00 and 10-01 on L510s) set to the same value
• L510s: PTC and frequency or PID source both on AVI, or wrong password

First checks, in this order

1. Change 11-08 to 11-10 or 11-11.
2. Set 00-12 above 00-13.
3. Give 00-05 and 00-06 different values.
4. On L510s, use a different source for PTC than for the frequency or PID command, and enter the correct password.

Err6: Communication failed

What it means: Serial communication failed.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Keypad operation error

Likely causes

• Wiring error
• Communication parameter setting error
• Wrong communication protocol

First checks, in this order

1. Check the hardware and wiring.
2. Check the communication settings 09-00 to 09-05.
3. On L510s, TECO also suggests grounding CON2 and increasing 09-08.

Err7: Parameter conflict

What it means: Parameter conflict.^{[6][7][8][11][12]}

Also on: Drives: E510, L510s.

Drive response: Keypad operation error

Likely causes

• Trying to change 13-00 or 13-08
• Voltage or current detection circuit abnormal

First checks, in this order

1. If the error cannot be reset, consult the supplier.