KEB COMBIVERT F5 Error Codes

E.OC: ERROR overcurrent

What it means: The output current went above the drive's peak current trip level, for example from a short circuit, a ground fault or a ramp that is too steep for the load. The drive switches off its output at once.^[1][2][3][4]

Also on: F5 Elevator drive software (EOC, Error Over Current, value 4)

Drive response: Modulation off at once; restart after reset, or automatically if Pn.2 is on.

Likely causes

• Acceleration or deceleration ramp too short for the load
• Load too heavy while the load acceleration stop (CP.24) and constant current limit (CP.25) are switched off
• Short circuit or ground fault in the motor cable or motor
• Motor cable too long
• Electrical noise (EMC), poor grounding or loose motor connections
• Motor contactor damaged or closing too late
• DC braking active on large units
• Shorted output transistor (trips the moment a run starts)

First checks, in this order

1. Note when it trips: accelerating, decelerating, at constant speed or right at the start.
2. Lengthen the acceleration and deceleration times (CP.12, CP.13) and check CP.24 (max. ramp current) and CP.25 (max. constant current, 200 % = off).
3. Power off, wait 5 minutes, disconnect the motor leads at the drive and measure motor and cable: phase to phase should read the winding resistance, phase to ground should read open. Megger only with the motor disconnected from the drive.
4. Check the motor contactor contacts and timing, the motor terminals, the cable shield and grounding.
5. If it still trips in an open loop test run with the motor leads disconnected, the output stage is faulty: have KEB repair the inverter or replace it.
6. In.26 shows how often E.OC has happened; automatic restart for E.OC is Pn.2.

E.OP: Error! Overvoltage

What it means: The DC link voltage rose above the trip level, about 400 V DC on 230 V units and about 800 V DC on 400 V units. Most often the motor feeds energy back into the drive while braking.^[1][2][3][4]

Also on: F5 Elevator drive software (EOP, Error Over Voltage, value 1)

Drive response: Modulation off; restart after reset, or automatically if Pn.1 is on.

Likely causes

• Deceleration ramp too short for the load inertia
• Braking resistor missing, wired wrong, too small or defective, or a faulty braking transistor
• Supply voltage too high, or voltage spikes on the line
• Speed controller overshoot from poor tuning
• Line regeneration unit not working (if used)

First checks, in this order

1. Watch CP.07 (DC voltage) and CP.08 (DC voltage peak) during a stop.
2. Lengthen the deceleration time (CP.13).
3. Check the braking resistor wiring, then measure its resistance with the power off and test the braking transistor.
4. Measure the line voltage. The DC bus should be about 1.41 x the line voltage; a 3 to 5 % line reactor helps against spikes, a step-down transformer against high line voltage.
5. Check the speed controller tuning for overshoot.
6. In.28 counts E.OP; automatic restart for E.OP is Pn.1.

E.UP: ERROR underpotential

What it means: The DC link voltage dropped below the permissible level, about 216 V DC on 230 V units and about 240 V DC on 400 V units. Usually the supply dipped or lost a phase.^[1][2][3][4]

Also on: F5 Elevator drive software (EUP, Error Under Voltage, value 2)

Drive response: Modulation off; with Pn.0 on (default) the error resets itself when the voltage returns.

Likely causes

• Supply voltage too low, unstable or dipping
• Missing input phase or blown fuse
• Voltage drop from undersized or badly connected supply cables
• Generator or transformer supply collapsing with very short ramps
• Drive rating too small for the load
• F5-G housing B only: lost communication between power circuit and control card
• Jump factor Pn.56 too small (power-off function)
• A digital input programmed as an external error with the E.UP response (Pn.65)

First checks, in this order

1. Measure all three supply phases at the drive under load; the phase to phase imbalance should stay below 2 %.
2. Check fuses, contactor, terminals and the supply cable size.
3. Compare the DC bus you measure with CP.07; it should be about 1.41 x the line voltage.
4. Check that the transformer or generator is big enough.
5. If the power-off function or special inputs are used, check Pn.56 and Pn.65.
6. E.UP is not stored in In.24. Automatic restart for E.UP (Pn.0) is on by default, so the drive can restart by itself when the voltage returns.

E.OH: ERROR overheat pow.mod.

What it means: The power module (heat sink) is too hot. The trip point depends on the power unit, usually 90 °C. The error accepts a reset only after the heat sink has cooled and E.nOH appears.^[1][2][3][4]

Also on: F5 Elevator drive software (EOH, Error Overheat Power Module, value 8)

Drive response: Modulation off; reset accepted only when E.nOH shows.

Likely causes

• Dirty or blocked heat sink, low air flow
• Ambient or cabinet temperature too high
• Cooling fan clogged or not running
• High continuous load
• Faulty temperature sensor (reads high on a cool heat sink)

First checks, in this order

1. Read the power module temperature in ru.38.
2. Check that the fans run and are not clogged; clean the heat sink and the cabinet filters.
3. Improve cabinet ventilation or lower the ambient temperature.
4. Reduce the load, or lower the switching frequency (CP.18) if it was raised.
5. Set an early warning with Pn.11 (OH warning level) and choose its response with Pn.10.
6. Wait for E.nOH, then reset. If ru.38 reads high on a cool heat sink, have the sensor repaired by KEB. In.29 counts E.OH.

E.OL: ERROR overload (Ixt)

What it means: Inverter overload: the load stayed above the rated level longer than allowed and the overload counter (ru.39) reached 100 %. The counter then counts down; the error accepts a reset only when E.nOL appears, and the drive must stay powered while it cools.^[1][2][3][4]

Also on: F5 Elevator drive software (EOL, Error Overload, value 16)

Drive response: Modulation off; the counter counts back to 0 %, then E.nOL shows.

Likely causes

• Mechanical fault, binding or overload in the machine
• Inverter too small for the duty
• Poor speed control tuning (overshoot)
• Motor wired wrong
• Damaged encoder
• Wrong motor data

First checks, in this order

1. Watch CP.06 (utilization) and ru.39 (overload counter) while running.
2. Check the machine for binding, friction or a jam.
3. Check the motor wiring, the motor data and the encoder.
4. Check the control tuning.
5. Set an overload warning with Pn.9 (level) and Pn.8 (response).
6. Keep the drive powered until E.nOL shows, then reset. In.27 counts E.OL.

E.dOH: ERROR drive overheat

What it means: Motor overtemperature: the PTC or thermal switch on terminals T1/T2 opened (resistance above 1650 ohm). The error accepts a reset only when the sensor is back in range and E.ndOH appears.^[1][2][3][4]

Also on: F5 Elevator drive software (EdOH, Error Motor Overheat, value 9)

Drive response: Set by CP.28 / Pn.12: immediate switch off, or quick stop first; E.dOH follows after the delay if the motor is still hot.

Likely causes

• Motor overloaded
• Poor motor cooling (fan, dirty cooling fins, long running at low speed)
• Broken or missing wire to the sensor at T1/T2

First checks, in this order

1. Measure the sensor resistance at T1/T2 with the wires disconnected from the drive; a cool PTC reads well below 1650 ohm.
2. Check the motor current against the nameplate, and check the motor cooling.
3. Check the sensor cable for breaks.
4. Check the response setting CP.28 (Pn.12) and the delay Pn.13; the drive trips with E.dOH if the motor is still too hot when the delay runs out (10 s in the CP menu).
5. Wait for E.ndOH, then reset.

E.OH2: ERROR motor protection

What it means: The drive's electronic motor protection relay (a thermal model of the motor based on its current) has tripped.^[1][2][3][4]

Also on: F5 Elevator drive software (EOH2, Error Motor Protection, value 30)

Likely causes

• Motor current above the protection rated current for too long
• Motor protection settings wrong: dr.11 (motor protection mode) or dr.12 (rated current)
• Wrong motor data or encoder settings
• Mechanical overload or friction

First checks, in this order

1. Compare the motor current with the motor nameplate.
2. Check dr.11 and dr.12 against the motor.
3. Check the load and the mechanics.
4. Pn.14 sets the response to the OH2 warning (Pn.15 sets the warning level on F5-S).
5. Let the motor cool, then reset.

E.Pu: ERROR power unit

What it means: General fault in the power circuit (power unit) of the inverter. Often written E.PU.^[1][2][3][4]

Also on: F5 Elevator drive software (EPU, Error Power Unit, value 12)

Likely causes

• Internal hardware fault in the power section

First checks, in this order

1. Power off, wait 5 minutes and look for visible damage, burn marks or loose power connections.
2. Power up once more and note when the error appears.
3. If it comes back, KEB says the inverter must be inspected and repaired by KEB or replaced.

E.EF: ERROR external fault

What it means: External fault: a digital input programmed as an external error input has tripped.^[1][2][3][4]

Also on: F5 Elevator drive software (EEF, Error External Fault, value 31)

Drive response: Default (Pn.3 = 0): modulation off, restart after reset.

Likely causes

• An external device wired to that input reported a fault (for example a motor thermal contact, a braking resistor thermostat, a safety chain or a controller output)
• Wiring fault on that input

First checks, in this order

1. Find which input triggers it (Pn.4, ext. fault input select).
2. Trace the device wired to that input and clear its fault.
3. Check the wiring of that input.
4. Pn.3 (shown as CP.36 in some CP menus) sets the reaction: 0 error with restart after reset, 1 or 2 fast stop first, 3 to 5 automatic restart when the fault clears, 6 off.

E.LSF: ERROR load shunt fault

What it means: The load shunt (DC link precharge relay) did not pick up. It shows briefly at every power-up and should clear by itself; if it stays, something is wrong.^[1][2][3][4]

Also on: F5 Elevator drive software (ELSF, Error Charge Relay Fault, value 15)

Likely causes

• Defective load shunt relay
• Input voltage wrong or too low
• High voltage drop in the supply cable
• Braking resistor wired to the wrong terminals or damaged
• Defective braking module or braking transistor
• Frequent power cycling or brown-outs wearing the relay

First checks, in this order

1. Measure the supply voltage at the drive terminals during power-up.
2. Check the supply cable size and connections.
3. Check the braking resistor wiring and test the braking transistor.
4. Do not switch the supply on and off more than once every 2 minutes.
5. If the error stays with correct voltage, the load shunt is defective: have the inverter repaired or replaced.

E.OL2: ERROR overload 2

What it means: Low speed overload: the current near standstill went above the standstill continuous current, where the power stage heats up fastest. The error accepts a reset only after the cooling time, when E.nOL2 appears.^[1][2][3][4]

Also on: F5 Elevator drive software (EOL2, Error Low Speed Overload, value 19)

Likely causes

• High current at very low speed or standstill (holding a load, heavy start)
• Wrong motor data or encoder settings
• High friction or a mechanical problem
• Inverter too small for low speed duty

First checks, in this order

1. Compare the current at low speed and at standstill with the standstill current in the technical data.
2. Verify the motor data and the encoder settings.
3. Check the mechanics for friction or binding.
4. Wait for E.nOL2, then reset.

E.UPh: ERROR Phase failure

What it means: Input phase failure: one supply phase is missing, detected from ripple on the DC link.^[1][2][3]

Likely causes

• Blown fuse or tripped breaker on one phase
• Open contactor pole or loose supply terminal
• Supply fault upstream

First checks, in this order

1. Measure all three phases at the drive input terminals.
2. Check fuses, breaker, contactor and terminals.
3. Check the phase imbalance.

nO_PU: power unit not ready

What it means: Status message: the control card is running but the power circuit is not ready or not identified, so the drive cannot run.^[1][2][3][4]

Also on: F5 Elevator drive software (no_PU, Power Unit Not Ready, value 13)

Likely causes

• Control card powered from an external supply while the mains is off
• Poor connection between the control card and the power stage
• Failed switching power supply in the power stage

First checks, in this order

1. Check that mains voltage is on the power terminals.
2. Power off, wait 5 minutes and reseat the ribbon cable between control card and power stage (housings G, H, R, U), or reseat the control card (housings D, E).
3. If it stays, the power stage supply may have failed: have KEB repair the inverter or replace it.

E.nOH: no E. over heat pow.mod.

What it means: All-clear after E.OH: the heat sink is back in its permissible range. The drive is still stopped; the error can now be reset.^[1][2][3]

Drive response: Drive stays off until reset.

Likely causes

• Follows an E.OH trip once the heat sink has cooled

First checks, in this order

1. Reset the error (ST, reset input or power cycle).
2. Before restarting, fix the cause of E.OH (fans, dirt, ambient temperature, load).

E.nOL: no ERROR overload

What it means: All-clear after E.OL: the overload counter is back at 0 % after the cooling phase, so the error can be reset. The inverter must stay switched on during the cooling phase.^[1][2][3][4]

Also on: F5 Elevator drive software (nEOL, no Error Overload, value 17)

Drive response: Drive stays off until reset.

Likely causes

• Follows an E.OL trip once the cooling phase has passed

First checks, in this order

1. Reset the error.
2. Fix the cause of the overload before running full load again.

E.ndOH: no ERROR drive overheat

What it means: All-clear after E.dOH: the motor PTC or thermal switch on T1/T2 is back in its normal range and the error can be reset.^[1][2][3][4]

Also on: F5 Elevator drive software (nEdOH, no Error Motor Overheat, value 11)

Drive response: Drive stays off until reset.

Likely causes

• Follows an E.dOH trip once the motor has cooled

First checks, in this order

1. Reset the error.
2. Fix the cause of the motor overheating (load, cooling) before running again.

E.nOL2: no ERROR overload 2

What it means: All-clear after E.OL2: the cooling time has passed and the error can be reset.^[1][2][3][4]

Also on: F5 Elevator drive software (nEOL2, no Error Low Speed Overload, value 20)

Drive response: Drive stays off until reset.

Likely causes

• Follows an E.OL2 trip once the cooling time has passed

First checks, in this order

1. Reset the error.
2. Reduce the current at low speed or standstill before running again.

E.OHI: ERROR overheat internal

What it means: The temperature inside the inverter is too high. The internal fan starts first; if it is still too hot after about 10 minutes, the switch-off time Pn.17 (0 to 120 s) runs and then E.OHI trips. The error accepts a reset only after the inside has cooled by at least 3 °C (E.nOHI).^[1][2][3]

Likely causes

• Cabinet or ambient temperature too high
• Poor cabinet ventilation
• Internal fan not running
• High continuous load

First checks, in this order

1. Measure the cabinet temperature and check the cabinet fans and filters.
2. Check that the inverter's internal fan runs.
3. Check Pn.16 (response to the OHI warning) and Pn.17 (switch-off delay).
4. Wait for E.nOHI, then reset. In.30 counts E.OHI.

E.nOHI: no ERROR overheat int.

What it means: All-clear after E.OHI: the interior temperature has fallen by at least 3 °C and the error can be reset.^[1][2][3]

Drive response: Drive stays off until reset.

Likely causes

• Follows an E.OHI trip once the inside of the inverter has cooled

First checks, in this order

1. Reset the error.
2. Fix the cabinet cooling before running again.

E.buS: ERROR bus

What it means: Communication watchdog: the link between the operator and a PC, or between the operator and the inverter, was silent longer than the watchdog time.^[1][2][3][4]

Also on: F5 Elevator drive software (EBus, Error HSP5 Serial Com., value 18)

Likely causes

• Serial cable to the PC or controller unplugged or broken
• Operator not seated properly on the inverter, or bent pins
• Electrical noise or wrong baud rate
• Watchdog time Pn.6 too short for the master

First checks, in this order

1. Reseat the operator and check its pins.
2. Check the serial cable and the connector at X6C.
3. Check that the master or PC is still sending.
4. Check Pn.6 (watchdog time) and Pn.5 (response, E.buS or A.buS).

E.OS: ERROR over speed

What it means: Overspeed: the measured speed went above the maximum output speed. On servo drives a wrong EMF setting can also cause it.^[1][2][3][4]

Also on: F5 Elevator drive software (EOS, Error Overspeed, value 58)

Likely causes

• Maximum speed limit set lower than the process needs
• Overhauling load driving the motor faster than the setpoint
• Speed controller overshoot or wrong gains
• Wrong motor data, or wrong encoder settings or pole position on PM motors
• Torque or current limit too low to hold the load

First checks, in this order

1. Check the maximum speed settings against the process.
2. Check the speed controller gains for overshoot.
3. Verify the motor data and encoder settings (line count, channel order, pole position on PM motors).
4. Check that the current or torque limit is high enough to control the load.

E.EEP: ERROR EEPROM defective

What it means: Fault in the parameter memory (EEPROM). After a reset the drive can run again, but parameter changes are not saved.^[1][2][3]

Likely causes

• Faulty parameter memory on the control card

First checks, in this order

1. Reset and check that the parameters are still correct.
2. Keep a parameter backup (for example in COMBIVIS).
3. If it keeps coming back, contact KEB about the control card.

E.EnC: Error! Encoder cable

What it means: Cable break detected at the resolver or incremental encoder input.^[2][1][4]

Also on: Same value 32 is shown as E.EnC1 in the application and operator manuals

Likely causes

• Broken or loose encoder cable or connector
• Encoder supply not matching the encoder
• During the encoder alignment run: wrong direction of rotation or two motor phases swapped

First checks, in this order

1. Check the encoder cable, connectors and shield.
2. Measure the signal pairs (A+/A-, B+/B-, N+/N-): a pair must never sit at the same level.
3. Check that the encoder supply matches the encoder rating.
4. On encoders without an N track, tie the unused N inputs high and low as KEB describes.
5. If it trips during system position alignment, check the motor phase order.

E.EnC1: Error! Encoder 1

What it means: Fault on the encoder at encoder interface 1: cable break, encoder too hot, speed too high, signals out of specification or an internal encoder error.^[1][3][4]

Also on: F5 Elevator drive software (EEnC1, Error Encoder1, value 32)

Likely causes

• Broken or loose encoder cable
• Encoder overheated or running above its speed rating
• Encoder signals out of specification (wrong encoder type or supply)
• Internal encoder fault

First checks, in this order

1. Check the encoder cable, connectors and shield.
2. Measure the signal pairs; a pair must never sit at the same level.
3. Check the encoder supply and type against the interface card.
4. Replace the encoder or the encoder card if the wiring is good.

E.EnC2: Error! Encoder 2

What it means: Fault on the encoder at encoder interface 2: cable break, encoder too hot, speed too high, signals out of specification or an internal encoder error.^[1][3]

Likely causes

• Broken or loose cable on encoder 2
• Encoder overheated or running above its speed rating
• Encoder signals out of specification
• Internal encoder fault

First checks, in this order

1. Check the encoder 2 cable, connectors and shield.
2. Check the encoder supply and type against the interface.
3. Replace the encoder if the wiring is good.

E.EnCC: Error! Encoder change

What it means: Synchronous motor with an intelligent (serial) encoder interface: the encoder was not connected at start, was changed, or serial communication with it stopped.^[1][4]

Also on: F5 Elevator drive software (E.ENCC / EENCC, Error Encoder Interface, value 35)

Likely causes

• Encoder unplugged or cable fault at power-up
• Encoder replaced
• Serial communication with the encoder lost

First checks, in this order

1. Check the encoder cable and connector.
2. If the encoder was replaced on purpose, confirm it by writing to ec.0, then learn the encoder (pole) position again before running.

E.Hyb: ERROR hybrid

What it means: The encoder interface card identifier is invalid, so the drive cannot recognize the encoder card.^[1][2][3][4]

Also on: F5 Elevator drive software (EHyb, Error Encoder Card, value 52)

Likely causes

• Encoder card not seated, or bent or missing pins
• Wrong encoder pinout pulling down the card supply
• Defective encoder card

First checks, in this order

1. Check that the encoder card is seated and its pins are straight.
2. Check the encoder wiring against the pinout.
3. Replace the encoder card if the error stays.

E.HybC: ERROR hybrid changed

What it means: The encoder interface identifier changed, for example after a different encoder card was fitted.^[1][2][3][4]

Also on: F5 Elevator drive software (EHybC, Error Encoder Card Changed, value 59)

Likely causes

• Encoder interface card replaced or changed

First checks, in this order

1. Confirm the new card by writing to ec.0 or ec.10; this loads the default values for the new interface.
2. Then set up the encoder parameters again.

E.br: ERROR brake

What it means: Brake control error (only with brake control on): at start the load was below the minimum load level Pn.43 or a missing motor phase was found, or the load was too high and the hardware current limit was reached.^[1][2][3][4]

Also on: F5 Elevator drive software (Ebr, Error Low Motor Current, value 56)

Likely causes

• Open motor phase: lead not connected, motor contactor not closing or burnt contacts
• Damaged motor winding
• Minimum load level Pn.43 set too high
• Load too heavy at brake release

First checks, in this order

1. Check all three motor leads and the motor contactor.
2. Measure the motor winding resistance.
3. Check Pn.43 and the brake control settings.
4. Check the load at brake release.

E.Cdd: ERROR calc. drive data

What it means: Error during the automatic measurement of the motor stator resistance (motor data identification).^[1][2][3][4]

Also on: F5 Elevator drive software (ECdd, Error Calculate Motor Data, value 60)

Likely causes

• Wrong motor data entered
• Motor not connected during the measurement (motor contactor open)
• Motor wiring fault

First checks, in this order

1. Check the motor data against the nameplate.
2. Make sure the motor contactor closes during the measurement.
3. Check the motor wiring, then repeat the measurement.

noP: no operation

What it means: Status message: the control release (terminal ST) is not switched on, so the output is off. Normal when the drive is not enabled.^[1][2][3]

Likely causes

• Enable signal from the controller or safety chain is off
• Broken wire on terminal ST

First checks, in this order

1. Check the ST input and its wiring.
2. Check the enable signal from the machine control or safety circuit.

LS: low speed

What it means: Status message: no direction of rotation is selected, so the modulation is off.^[1][2][3]

Likely causes

• Forward and reverse inputs both off
• Direction source set to another input or the bus (CP.34)

First checks, in this order

1. Check the F and R inputs and the run command from the controller.
2. Check CP.34 (source of rotation direction).

bbL: base block

What it means: Status message: the power modules are locked for a short time so the motor can de-energize, for example after the enable is removed. Not a fault itself, but it often shows just before a fault.^[1][2][3][4]

Also on: F5 Elevator drive software (bbL, Base Block, value 76)

Likely causes

• Enable (ST) removed while the drive was putting out current
• Normal pause after the modulation switches off

First checks, in this order

1. If it appears during a run, check why the enable dropped while current was flowing.
2. uF.12 sets the base block time.

E.SEt: ERROR set

What it means: A locked parameter set was selected.^[1][2][3]

Drive response: Programmed response: error, restart after reset (Pn.18).

Likely causes

• Set selection inputs or the bus selecting a set that is locked

First checks, in this order

1. Check which parameter set is being selected and which sets are locked.
2. Check Pn.18 (E.Set stopping mode).

E.Puci: ERROR pow. unit code inv.

What it means: At power-up the control card could not recognize the power circuit, or found it invalid.^[1][2][3][4]

Also on: F5 Elevator drive software (EPuci, Error Power Unit Invalid, value 49)

Likely causes

• Electrical noise at power-up
• Poor ribbon cable connection between control card and power stage
• Unbalanced supply voltage

First checks, in this order

1. Disconnect the control terminal strip, the encoder cable and the serial link, then power cycle.
2. Check that the line voltages are balanced phase to phase and phase to ground.
3. With the power off for 5 minutes, reseat the ribbon cable between control card and power stage.

E.Puch: ERROR power unit changed

What it means: The power circuit identification changed, for example after the control card was fitted to a different power unit.^[1][2][3][4]

Also on: F5 Elevator drive software (EPuch, Error Power Unit Changed, value 50)

Likely causes

• Control card or power unit replaced

First checks, in this order

1. Make sure the control card and power unit belong together.
2. Write SY.3: writing the value it shows reloads only the power-unit dependent parameters, while any other value loads the factory defaults.
3. Some units need a power-on reset after writing SY.3. Check the parameters afterwards.

E.dri: ERROR driver relay

What it means: The relay that supplies the power transistor drivers did not pick up even though the control release was given.^[1][2][3]

Likely causes

• Internal fault in the power circuit or its driver supply

First checks, in this order

1. Power off, wait 5 minutes, power up and give the control release again.
2. If it repeats, have the inverter checked by KEB.

E.PUCO: ERROR power unit commun.

What it means: A parameter value could not be written to the power circuit (the power circuit did not acknowledge it).^[1][2]

Likely causes

• Communication problem between the control card and the power circuit

First checks, in this order

1. Power cycle and repeat the parameter change.
2. If it repeats, check the control card to power unit connection and contact KEB.

E.PUIN: ERROR power unit invalid

What it means: The software versions of the power circuit and the control card do not match. This error cannot be reset (F5-G housing B only).^[1][2]

Likely causes

• Control card and power circuit with different software versions

First checks, in this order

1. Contact KEB for a matching control card or software.

E.PFC: ERROR Power factor control

What it means: Fault in the power factor control.^[1][2]

Likely causes

• Fault in the power factor correction stage or its supply

First checks, in this order

1. Check the supply voltage and connections.
2. If it repeats, contact KEB.

E.iPH: ERROR Output phase

What it means: A phase loss was detected at the drive output (motor side).^[3]

Likely causes

• Motor lead not connected or loose
• Motor contactor pole open
• Broken motor winding

First checks, in this order

1. Check all three motor leads and terminals.
2. Check the motor contactor.
3. Measure the motor winding resistance phase to phase.

E.Acc: ERROR maximum acceleration

What it means: The maximum allowed acceleration was exceeded. A.Acc is the matching warning.^[3]

Likely causes

• Setpoint changing faster than the acceleration limit allows (for example a jumping bus or analog setpoint)
• Acceleration limit set too low

First checks, in this order

1. Check the setpoint source for steps or noise.
2. Check the ramps and the acceleration limit settings.

E.SCL: ERROR speed controller limit

What it means: The speed controller reached its limit, so the drive could not follow the speed setpoint. A.SCL is the matching warning.^[3]

Likely causes

• Load too high for the torque or current limit
• Wrong motor data or encoder settings
• Mechanical binding

First checks, in this order

1. Check the load and the mechanics.
2. Check the torque and current limits.
3. Verify the motor data and encoder settings.

STO: ERROR safety

What it means: Fault in a function monitored by the optional safety module.^[3]

Drive response: Reset only by switching the power off and on.

Likely causes

• Safety function triggered or safety module fault

First checks, in this order

1. Check the safety module wiring and status (see KEB safety manual 00F5N1S-K000).
2. This error cannot be reset with a digital input: switch the inverter off and on again.

E.co1: ERROR counter overrun 1

What it means: Counter overflow on encoder channel 1.^[1][2][4]

Also on: F5 Elevator drive software (Eco1, value 54, in the DG02 status list)

Likely causes

• Encoder channel 1 counter overflowed

First checks, in this order

1. Check the encoder 1 settings and wiring.
2. Reset and see whether it returns; if it does, contact KEB with the application details.

E.co2: ERROR counter overrun 2

What it means: Counter overflow on encoder channel 2.^[1][2][4]

Also on: F5 Elevator drive software (Eco2, value 55, in the DG02 status list)

Likely causes

• Encoder channel 2 counter overflowed

First checks, in this order

1. Check the encoder 2 settings and wiring.
2. Reset and see whether it returns; if it does, contact KEB with the application details.

E.iEd: ERROR input error detect

What it means: Hardware fault at the PNP/NPN input switch-over, or an input failure.^[1][2][3]

Likely causes

• Digital input wiring or input supply fault
• Control card input hardware fault

First checks, in this order

1. Check the digital input wiring and the input supply.
2. Check the PNP/NPN setting.
3. If it stays, the control card needs service by KEB.

E.InI: ERROR initialisation MFC

What it means: The control card processor (MFC) did not boot.^[1][2][3][4]

Also on: F5 Elevator drive software (EInI, Error Initialization MFC, value 57)

Likely causes

• Control card fault

First checks, in this order

1. Power cycle the drive.
2. If it stays, replace the control card (KEB).

E.PrF: ERROR prot. rot. for.

What it means: The drive ran onto the forward (right) limit switch, with the response set to error, restart after reset.^[1][2][3]

Likely causes

• Axis overtravel from a wrong setpoint, positioning error or encoder problem
• Faulty limit switch or input wiring

First checks, in this order

1. Find out why the axis reached the limit switch.
2. Check the limit switch and its input.
3. Reset, then move the axis back in reverse.

E.Prr: ERROR prot. rot. rev.

What it means: The drive ran onto the reverse (left) limit switch, with the response set to error, restart after reset.^[1][2][3]

Likely causes

• Axis overtravel from a wrong setpoint, positioning error or encoder problem
• Faulty limit switch or input wiring

First checks, in this order

1. Find out why the axis reached the limit switch.
2. Check the limit switch and its input.
3. Reset, then move the axis back forward.

E.SLF: ERROR! Software limit switch forward

What it means: The target position lies beyond the forward (right) software limit.^[1][2][3]

Likely causes

• Target position from the controller outside the allowed range
• Software limit or reference point set wrong

First checks, in this order

1. Check the target position sent to the drive.
2. Check the software limit settings and the reference point.

E.SLr: ERROR software limit switch reverse

What it means: The target position lies beyond the reverse (left) software limit.^[1][2][3]

Likely causes

• Target position from the controller outside the allowed range
• Software limit or reference point set wrong

First checks, in this order

1. Check the target position sent to the drive.
2. Check the software limit settings and the reference point.

E.SbuS: ERROR bus synchron

What it means: Synchronization over the SERCOS bus is not possible.^[1][2][3]

Likely causes

• SERCOS ring or fiber optic connection fault
• Master synchronization settings wrong

First checks, in this order

1. Check the SERCOS ring and fiber optic connections.
2. Check the master settings for cycle time and synchronization.

A.OL: ABN.STOP overload

What it means: Overload warning: the overload counter (ru.39) passed the level set in Pn.9. Pn.8 sets what the drive does.^[1][2][3]

Drive response: Programmable with Pn.8.

Likely causes

• Load near or above the inverter rating

First checks, in this order

1. Check CP.06 (utilization) and ru.39.
2. Reduce the load or fix mechanical problems before it becomes E.OL.
3. Check Pn.8 and Pn.9.

A.OH: A.STOP overheat pow.mod

What it means: Heat sink warning: the power module temperature passed the warning level set in Pn.11. Pn.10 sets what the drive does.^[1][2][3]

Drive response: Programmable with Pn.10.

Likely causes

• Heat sink running hot (dirt, fan, ambient, load)

First checks, in this order

1. Read ru.38 and check the fans and heat sink.
2. Check Pn.10 and Pn.11.

A.OH2: ABN.STOP motor protect.

What it means: Motor protection warning: the electronic motor protection reached its warning point. Pn.14 sets what the drive does.^[1][2][3]

Drive response: Programmable with Pn.14.

Likely causes

• Motor current above the protection rated current (dr.12) for some time

First checks, in this order

1. Check the motor current and load.
2. Check dr.11, dr.12 and Pn.14.

A.dOH: ABN.STOP drive over heat

What it means: Motor temperature warning: the motor passed the warning level and the switch-off time Pn.13 has started. Pn.12 (CP.28) sets what the drive does. Needs a power circuit with this feature.^[1][2][3]

Drive response: Programmable with Pn.12 (CP.28).

Likely causes

• Motor running hot (load, cooling)

First checks, in this order

1. Check the motor load and cooling.
2. If the motor is still hot when Pn.13 runs out, E.dOH follows.
3. Check Pn.12 and Pn.13.

A.OHI: ABN.STOP overheat int.

What it means: Interior temperature warning: the inside of the inverter is above the permissible level and the switch-off time Pn.17 has started. Pn.16 sets what the drive does.^[1][2][3]

Drive response: Programmable with Pn.16.

Likely causes

• Cabinet too hot or poorly ventilated

First checks, in this order

1. Check the cabinet temperature and ventilation.
2. Check Pn.16 and Pn.17.

A.EF: ABN.STOP external fault

What it means: External fault input is active, with a reaction other than a plain error chosen in Pn.3 (fast stop or automatic restart).^[1][2][3]

Drive response: Programmable with Pn.3.

Likely causes

• External device wired to the fault input reported a problem

First checks, in this order

1. Find the input in Pn.4 and check the device wired to it.
2. Check Pn.3.

A.buS: ABN.STOP bus

What it means: Communication watchdog warning between operator and control card or operator and PC. Pn.5 sets what the drive does.^[1][2][3]

Drive response: Programmable with Pn.5.

Likely causes

• Serial link to the operator or PC interrupted

First checks, in this order

1. Check the operator seating and the serial cable.
2. Check Pn.5 and Pn.6.

POFF: power off function

What it means: Status message: the power-off function is active after a supply loss. Depending on its setup, the drive restarts by itself when the supply returns, or after a reset.^[1][2][3]

Likely causes

• Supply dip or loss with the power-off function programmed

First checks, in this order

1. Check the supply for dips.
2. Check the power-off function settings (application manual chapter 6.9).

HCL: hardware current limit

What it means: Status message: the output current reached the hardware current limit, so the drive is limiting current.^[1][2][3]

Likely causes

• Load or ramp asking for more current than the drive can deliver

First checks, in this order

1. Check the load and the ramps.
2. If it shows often, expect E.OC: lengthen the ramps and check the motor.
3. uF.15 sets the hardware current limit mode.

SLL: stall

What it means: Status message: at constant speed the load is held at the current limit (CP.25), so the drive lowers its output frequency.^[1][2][3]

Likely causes

• Load above the constant current limit
• Mechanical overload

First checks, in this order

1. Check the load and CP.25.
2. Check the mechanics.

3: ERROR overcurrent PU

What it means: The power unit's overcurrent detection tripped, for example from a short circuit or a defective power module.^[6]

Drive response: Modulation off at once; the motor coasts.

Likely causes

• Short circuit or ground fault in the motor cable or motor
• Defective power module

First checks, in this order

1. Power off, wait for the DC link to discharge, disconnect the motor leads and check motor and cable for shorts and ground faults.
2. If the motor side is good, have the power unit checked by KEB.

4: ERROR overcurrent analog

What it means: The current measured on the control board went above the overcurrent level, often because of wrong controller settings or the torque limiting characteristic.^[6]

Likely causes

• Current or speed controller settings wrong
• Torque limiting characteristic set wrong
• Maximum current settings not matched to motor and drive

First checks, in this order

1. Check the motor data and the controller gains.
2. Check the torque limit and maximum current settings (dr12 max. current %, is11, is35).
3. Lengthen the ramps if it trips while accelerating or braking.

5: ERROR over potential

What it means: DC link overvoltage. Trip levels: 400 V on 230 V units, 840 V on 400 V units, 1200 V on 690 V units. The error accepts a reset only after 60 seconds.^[6]

Likely causes

• Deceleration ramp too fast
• Braking resistor not connected
• Braking transistor defective
• High regenerative voltage from a fast synchronous motor (EMF)

First checks, in this order

1. Lengthen the deceleration ramp.
2. Check the braking resistor connection and the braking transistor.
3. Measure the supply voltage.
4. Wait 60 seconds before resetting. If ru01 shows 119 ERROR extreme overpotential, the DC link went even higher: have the DC capacitors checked.

6: ERROR under potential

What it means: DC link undervoltage: the DC link fell below the UP level (is18).^[6]

Likely causes

• Supply voltage too low, or a supply dip
• Missing input phase
• Supply switched off while the drive was enabled

First checks, in this order

1. Measure the supply under load.
2. Check fuses, contactors and terminals.
3. Automatic reset when the supply returns can be enabled in pn83 bit 0, with a time limit in pn84[1].

7: ERROR overload

What it means: Inverter overload (I2t): the long-term load went above 100 % and the OL counter ru29 reached 100 %. A reset is possible once ru29 falls below half the warning level pn03 (message 8, reset E. overload).^[6]

Likely causes

• Continuous load above the inverter rating
• Mechanical overload or binding
• Inverter too small for the duty

First checks, in this order

1. Watch ru29 while running.
2. Check the load, the mechanics and the drive sizing.
3. Set a warning level in pn03; pn04 sets the reaction.

9: ERROR overload 2

What it means: Fast overload protection of the power components at low output frequency: the standstill continuous current and short time current limit were exceeded.^[6]

Likely causes

• High current at standstill or very low speed
• Holding a heavy load at zero speed

First checks, in this order

1. Watch ru27 (OL2 counter) and ru73 (actual current to short time limit).
2. Reduce the current at standstill or very low speed.
3. pn05 sets an OL2 warning level.

10: ERROR overheat powmod.

What it means: Heat sink overtemperature. A reset is possible once the temperature is 5 °C below the trip level (message 11, reset E overheat pmod.).^[6]

Likely causes

• Fan fault, dirty heat sink or high ambient temperature
• High load, switching frequency or DC link voltage

First checks, in this order

1. Read the heat sink temperatures in ru25.
2. Check the fans, heat sink and ambient temperature.
3. Set a warning with pn06 and pn07; pn08 sets the reaction.
4. If cooling is limited, limit the inverter current with is11.

12: ERROR overheat internal PU

What it means: Overtemperature inside the power unit. Message 13 shows when it has cooled.^[6]

Likely causes

• Cabinet too hot or poorly ventilated
• High continuous load

First checks, in this order

1. Read the internal temperatures in ru26.
2. Check the cabinet temperature and ventilation.
3. pn09 sets the warning level, pn10 the reaction.

14: ERROR motorprotection

What it means: The electronic (software) motor protection tripped. Message 15 shows when it can be reset.^[6]

Likely causes

• Motor current above the protection current for too long
• Motor protection settings wrong
• Mechanical overload

First checks, in this order

1. Compare the motor current with the nameplate.
2. For induction motors, check dr34 (motorprotection curr. %) and dr39 (self or separately cooled).
3. Let the motor cool, then reset.

16: ERROR drive overheat

What it means: The motor temperature sensor (for example PTC or KTY) tripped. Message 17 shows when the motor has cooled.^[6]

Likely causes

• Motor overloaded or poorly cooled
• Sensor wiring fault
• Sensor type or levels set wrong

First checks, in this order

1. Read ru28 (motor temperature) and check dr33 (sensor type).
2. For a PTC, pn13 sets the delay between the PTC trip and the error.
3. For KTY or PT1000, pn11 is the warning level and pn14 the error level; pn12 sets the reaction.
4. Check the motor cooling, load and sensor wiring.

18: ERROR overspeed

What it means: The speed went above pn26 x rated speed.^[6]

Likely causes

• Overhauling load
• Speed control or encoder problem
• pn26 set too low for the process

First checks, in this order

1. Check pn26 against the process.
2. Check the speed control and the encoder.
3. pn27 sets the reaction.

23: ERROR speed diff

What it means: The difference between setpoint and actual speed stayed above pn38 for longer than pn39.^[6]

Likely causes

• Drive at its current or torque limit and unable to follow
• Mechanical binding or overload
• Wrong encoder settings, or wrong system position on a synchronous motor

First checks, in this order

1. Check the load and the current limits.
2. Check the encoder and motor settings.
3. Check pn38, pn39 and pn41; pn40 sets the reaction.

52: ERROR undervoltage phase

What it means: Input phase failure (E.Uph): the DC link ripple is too high, or its frequency shows a missing input phase.^[6]

Likely causes

• Missing input phase (fuse, contactor, terminal)
• Phase imbalance
• Ripple caused by the application (load cycles or controller oscillation)

First checks, in this order

1. Measure all three input phases.
2. Check fuses and terminals.
3. pn42 sets the reaction; the more sensitive check can be set to warning only or switched off if the application itself causes ripple.

59: ERROR prg. input

What it means: External error triggered through a programmable digital input.^[6]

Likely causes

• External device wired to the input reported a fault
• Wiring fault on the input

First checks, in this order

1. Find the input in pn30 (prg. error source).
2. Check the external device and its wiring.
3. pn29 sets the reaction.

92: ERROR encoder A

What it means: Encoder channel A fault: hardware defect or wrong encoder parameter settings (type, increments per revolution).^[6]

Likely causes

• Encoder cable or encoder defect
• Encoder type or line count set wrong

First checks, in this order

1. Check the encoder cable and connector.
2. Check the encoder type in ec16 and the other encoder parameters.
3. Read the encoder interface error in ec00.
4. pn34 sets the reaction (default: fault).