LS Electric Inverter Trip Codes

OCt: Over Current1

What it means: Output current went above the trip level, so the drive shut off its output. The S100 manual puts the level at 200% of the inverter rated current.^[1][2]

Also on: iG5A shows the same OCt code (see the iG5A row)

Likely causes

• Acceleration or deceleration time too short for the load inertia
• Load bigger than the drive rating
• Drive started into a motor that was still coasting
• Motor mechanical brake acting too fast
• Ground fault in the output wiring or damaged motor insulation
• On small units without ground fault detection, a low resistance ground fault can show as OCt

First checks, in this order

1. Increase ACC and dEC (acceleration and deceleration time in the Operation group).
2. Compare the motor current with the drive rating and resize if the load is too big.
3. Start only after the motor has stopped, or use speed search (Cn.60).
4. Check the timing of the motor mechanical brake.
5. Check the output wiring and the motor insulation.

OVt: Over Voltage

What it means: The internal DC link voltage went above its limit, usually because the motor fed energy back into the drive while slowing down.^[1][2]

Also on: iG5A (same code, see the iG5A row)

Likely causes

• Deceleration time too short for the load inertia
• Regenerative (overhauling) load on the motor
• Supply voltage too high
• Ground fault in the output wiring or damaged motor insulation

First checks, in this order

1. Increase dEC (deceleration time).
2. Fit a braking resistor or braking unit for regenerative loads.
3. Measure the supply voltage at R, S and T.
4. Check the output wiring and the motor insulation.

OVt: Over voltage trip

What it means: iG5A overvoltage trip: the DC link voltage went too high, typically during fast deceleration of a heavy load. LS writes it as Ovt.^[3]

Also on: S100, G100 (same code)

Likely causes

• Deceleration time too short
• Overhauling or high inertia load
• Supply voltage too high
• Braking resistor missing, undersized or limited by its duty setting

First checks, in this order

1. Increase dEC.
2. Check the braking resistor and its duty settings (H75 and H76).
3. Measure the supply voltage.

LVt: Low Voltage

What it means: The DC link voltage dropped below its limit. This is a Level type trip: it clears by itself when the voltage recovers. Seeing it briefly at power down is normal.^[1][2]

Also on: iG5A (same code, see the iG5A row)

Likely causes

• Supply voltage too low or a supply dip
• Large load on the same supply, such as a welder or a motor started direct on line
• Bad contact in the main contactor on the supply side

First checks, in this order

1. Measure the supply voltage at R, S and T under load.
2. Check the supply capacity and large loads on the same feeder.
3. Check or replace the main contactor.
4. On the G100, Pr.81 (LVT Delay) delays the trip handling when a relay is set to 11 (Low Voltage).

LVt: Low voltage trip

What it means: iG5A low voltage trip: the DC link voltage fell below its limit. LS writes it as Lvt.^[3]

Also on: S100, G100 (same code)

Likely causes

• Supply voltage too low or a short power loss
• Loose supply connection or bad main contactor
• Supply overloaded by other equipment

First checks, in this order

1. Measure the supply voltage at R, S and T.
2. Check the supply terminals and the main contactor.
3. Check what else runs on the same supply.

OLt: Over Load

What it means: Motor overload trip: motor current stayed above the overload trip level (Pr.21) for the trip time (Pr.22). Active when Pr.20 is not 0.^[1][2]

Also on: iG5A (same code, see the iG5A row)

Likely causes

• Load greater than the motor rated capacity
• Overload trip level (Pr.21) set too low

First checks, in this order

1. Measure the motor current and compare it with the nameplate.
2. Check Pr.20 (OL Trip Select), Pr.21 (OL Trip Level) and Pr.22 (OL Trip Time).
3. Use the overload early warning (Pr.17 to Pr.19) to catch it before it trips.
4. Resize the motor and drive if the load is really that high.

OLt: Overload

What it means: iG5A motor overload trip, set by F56 (overload fault select), F57 (level, default 180%) and F58 (time, default 60 s).^[3]

Also on: S100, G100 (same code, settings are Pr.20 to Pr.22)

Likely causes

• Load greater than the motor rating
• F57 level or F58 time set too low

First checks, in this order

1. Measure the motor current against the nameplate.
2. Check F56, F57 and F58.
3. Use the overload warning in F54 and F55 for an early signal.

IOL: Inverter OLT

What it means: The drive protected itself from overload and overheating on an inverse time curve: 150% for 1 minute and 200% for 4 seconds in heavy duty (the G100 normal duty rating is 120% for 1 minute).^[1][2]

Also on: iG5A shows IOLt (see the iG5A row)

Likely causes

• Load greater than the rated capacity
• Torque boost level too high

First checks, in this order

1. Measure the output current against the drive rating.
2. Reduce the torque boost.
3. Check the load duty setting Pr.04 (Normal or Heavy Duty).
4. Resize the motor and drive if needed.

IOLt: Drive overload

What it means: iG5A inverter overload: the drive itself was overloaded for too long and tripped to protect its power stage.^[3]

Also on: S100, G100 show IOL for the same protection

Likely causes

• Load greater than the drive rating
• Torque boost too high
• Repeated heavy starts

First checks, in this order

1. Measure the output current against the drive rating.
2. Reduce the torque boost.
3. Resize the drive if the load is really that high.

OHt: Over Heat

What it means: The heatsink temperature went above its limit.^[1][2]

Also on: iG5A (same code, see the iG5A row)

Likely causes

• Cooling problem: blocked air inlet, outlet or vent
• Cooling fan worn after long use
• Ambient temperature too high

First checks, in this order

1. Remove anything blocking the air inlet, outlet or vents.
2. Check the cooling fan and replace it if worn.
3. Keep the ambient temperature below 50 °C; check cabinet ventilation.

OHt: Drive overheat

What it means: iG5A heatsink overtemperature trip.^[3]

Also on: S100, G100 (same code)

Likely causes

• Blocked airflow or dirty heatsink
• Cooling fan failed
• Ambient or cabinet temperature too high

First checks, in this order

1. Clean the heatsink and vents.
2. Check the fan and its control setting (H77).
3. Check the cabinet temperature and ventilation.

GFt: Ground Trip

What it means: A ground fault on the drive output pushed the current above a level that depends on drive size. Small S100 units (4.0 kW and below) and G100 units under 4.0 kW (except 2.2 kW and 4.0 kW 200 V) lack this trip and show OCt or OVt instead.^[1][2]

Likely causes

• Ground fault in the output wiring
• Damaged motor insulation

First checks, in this order

1. Disconnect the motor cable from U, V and W and test the motor and cable insulation.
2. Check the output wiring for damage.
3. Replace the motor if its insulation is damaged.
4. On G100 200 V 2.2 kW and 4.0 kW units, also check for input phase loss when GFt appears.

EtH: E-Thermal

What it means: Motor electronic thermal protection: the drive's inverse time model says the motor is overheating. Active when Pr.40 is not 0.^[1][2]

Also on: iG5A (see the iG5A row)

Likely causes

• Motor overheated
• Load greater than the rated capacity
• Electronic thermal level set too low
• Self-cooled motor run at low speed for a long time

First checks, in this order

1. Reduce the load or the running frequency.
2. Check Pr.40 (ETH Trip Sel), Pr.41 (Motor Cooling), Pr.42 (ETH 1min) and Pr.43 (ETH Cont).
3. Check the motor rated current in bA.13.
4. For long low-speed running, use a forced-cooled motor and set Pr.41 to match.

POt: Out Phase Open

What it means: One or more output phases to the motor are open. Active when bit 1 of Pr.05 is set.^[1][2]

Also on: iG5A (see the iG5A row)

Likely causes

• Bad contact in an output side contactor
• Faulty or loose output wiring

First checks, in this order

1. Check the contactor on the output side.
2. Check the U, V and W terminals and the motor terminal box.
3. Check the Pr.05 (Phase Loss Chk) setting.

IPO: In Phase Open

What it means: One or more input phases are open. Active only when bit 2 of Pr.05 is set.^[1][2]

Likely causes

• Bad contact in the input side contactor
• Faulty input wiring or a blown fuse
• DC link capacitor due for replacement

First checks, in this order

1. Measure all three supply phases and check the fuses.
2. Check the input side contactor and wiring.
3. Check Pr.05 (Phase Loss Chk) and Pr.06 (IPO V Band).
4. If supply and wiring are fine, contact LS ELECTRIC service about the DC link capacitor.

OC2: Over Current2

What it means: The DC circuit detected a short circuit level current (LS also calls it an ARM short current fault trip).^[1][2]

Likely causes

• Short circuit in the output wiring
• Failed power semiconductor (IGBT)
• Ground fault in the output wiring or damaged motor insulation

First checks, in this order

1. Check the output wiring for a short circuit.
2. Check the motor insulation.
3. If the IGBTs are suspected, do not run the drive again; contact LS ELECTRIC service.

Ext: External Trip

What it means: An external fault signal came in on a multi-function input set to 4 (External Trip).^[1][2]

Also on: iG5A uses EtA and EtB (see those rows)

Likely causes

• An external device (thermal relay, resistor thermostat, interlock) opened or closed its fault contact
• Wiring fault on that input
• Input contact type (normally open or normally closed) set wrong

First checks, in this order

1. Find which Px input is set to 4 in In.65 to In.71 (S100) or In.65 to In.72 (G100).
2. Check the external device and its wiring.
3. Check In.87 (DI NC/NO Sel) for the contact type.
4. Reset after the external fault is cleared.

EtA: External trip: A Contact

What it means: iG5A external trip from a normally open (A contact) input: a multi-function input set to 18 closed.^[3]

Also on: S100, G100 use Ext with In.87 for the contact type

Likely causes

• External device closed its fault contact
• Wiring short on that input

First checks, in this order

1. Find the input (I17 to I24) set to 18.
2. Check the external device and the wiring.
3. Reset after the cause is cleared.

EtB: External trip: B Contact

What it means: iG5A external trip from a normally closed (B contact) input: a multi-function input set to 19 opened.^[3]

Also on: S100, G100 use Ext with In.87 for the contact type

Likely causes

• External device opened its contact
• Broken wire or loose terminal on that input

First checks, in this order

1. Find the input (I17 to I24) set to 19.
2. Check the external device and the loop for a break.
3. Reset after the cause is cleared.

LOr: Lost Command

What it means: The frequency or run command was lost while running from a source other than the keypad (terminals or communication). Active when Pr.12 is not 0. Level type.^[1][2]

Likely causes

• Analog reference wire broken or signal below the loss level
• RS-485 or network communication lost
• Controlling PLC stopped sending

First checks, in this order

1. Check Pr.12 (Lost Cmd Mode), Pr.13 (Lost Cmd Time), Pr.14 (Lost Preset F) and Pr.15 (AI Lost Level).
2. Measure the analog reference at the V1 or I2 terminal.
3. Check the communication cable and the master.

FAn: Fan Trip

What it means: The drive detected a cooling fan error and tripped (Pr.79 set to 0, Trip).^[1][2]

Also on: iG5A (see the iG5A row)

Likely causes

• Foreign object blocking the fan
• Fan connector unplugged
• Fan worn out

First checks, in this order

1. Remove anything blocking the fan or air path.
2. Check that the fan connector is plugged in.
3. Replace the cooling fan.
4. Check Pr.79 (FAN Trip Mode) and the fan life counters Pr.86 and Pr.87.

HWt: H/W-Diag

What it means: Hardware self-diagnosis failed: EEP Err (parameter memory or keypad), ADC Off Set (current sensing circuit) or Watch Dog-1 or Watch Dog-2 (CPU). Fatal type: it only clears after a full power cycle.^[1][2]

Also on: iG5A (see the iG5A row)

Likely causes

• Parameter memory or keypad fault (EEP Err)
• Current sensing circuit fault (ADC Off Set)
• CPU watchdog error

First checks, in this order

1. Switch off, wait until the charge lamp is off, then switch on again.
2. For EEP Err, check the keypad connection.
3. If it comes back, contact the supplier or LS ELECTRIC service.

ntC: NTC Open

What it means: The IGBT temperature sensor reported an error.^[1][2]

Likely causes

• Ambient temperature too low
• Internal temperature sensor fault

First checks, in this order

1. Keep the ambient temperature above minus 10 °C.
2. If the ambient is fine, contact the supplier or LS ELECTRIC service.

LV2: Low Voltage2

What it means: The DC link voltage dropped during operation. Unlike LVt it latches and needs a reset. Enabled by Pr.82 (LV2 Selection).^[1][2]

Likely causes

• Supply voltage dropped while running
• Input phase loss at low voltage
• Faulty supply side contactor

First checks, in this order

1. Measure the supply voltage while running.
2. Check the input wiring and fuses.
3. Check or replace the supply contactor.
4. Check Pr.82, then reset the drive.

ULt: Under Load

What it means: Motor underload trip: the load stayed below the underload level. Active when Pr.27 is not 0.^[1][2]

Likely causes

• Load disconnected: broken belt or coupling, dry running pump
• Underload levels (Pr.29, Pr.30) set above the real minimum load

First checks, in this order

1. Check belts, couplings and the pump.
2. Check Pr.27 (UL Trip Sel), Pr.28 (UL Trip Time), Pr.29 and Pr.30.
3. Lower the underload levels if they are above the normal minimum load.

bX: BX

What it means: The drive output was blocked by a multi-function input set to 5 (BX), often wired as an emergency stop. The motor coasts. Level type: it runs again when BX turns off and a run command is given.^[1][2]

Also on: iG5A uses EST for its emergency stop input (see the EST row)

Likely causes

• BX input turned on (emergency stop pressed or interlock open)
• Wiring fault on the BX input

First checks, in this order

1. Find which Px input is set to 5 in In.65 onward and check what is wired to it.
2. Release the emergency stop or interlock, then give a new run command.

EST: Emergency stop

What it means: iG5A emergency stop: a multi-function input set to 2 (EST) turned on and the drive blocked its output.^[3]

Also on: S100, G100 use bX (BX)

Likely causes

• Emergency stop button or interlock wired to the EST input
• Wiring fault on that input

First checks, in this order

1. Find the input (I17 to I24) set to 2.
2. Release the emergency stop and check the wiring.

nMt: No Motor Trip

What it means: A run command was given but the drive saw too little output current, as if the motor were disconnected. Active when Pr.31 is set to 1.^[1][2]

Likely causes

• Motor disconnected or output contactor open
• Pr.32 level too high, for example with a square V/F pattern

First checks, in this order

1. Check the output contactor sequence and the motor cable.
2. Check Pr.31, Pr.32 (No Motor Level) and Pr.33 (No Motor Time).
3. With bA.07 set to Square, set Pr.32 lower than its default.

PId: Pre-PID Fail

What it means: During pre-PID operation (AP.34 to AP.36) the PID feedback stayed below the set value, which the drive treats as a load fault.^[1][2]

Likely causes

• Pump not building pressure or flow
• Feedback sensor or wiring fault
• Pre-PID settings not matched to the process

First checks, in this order

1. Check the feedback sensor and its wiring.
2. Check the pump, valves and pipework for leaks or air.
3. Check AP.34 to AP.36.

Xbr: Ext-Brake

What it means: External brake control fault: the output current at start stayed below the brake open current (Ad.41) when a relay is set to 35 (BR Control).^[1][2]

Likely causes

• Motor not connected or very low starting current
• Brake open current (Ad.41) set too high
• Brake sequence settings wrong

First checks, in this order

1. Check the motor wiring.
2. Check the brake settings starting at Ad.41.
3. Check that OU.31 or OU.32 is set to 35 and the brake wiring.

IOt: IO Board Trip

What it means: The I/O board or an external communication card is missing or badly connected. If the error lasts over 5 seconds the keypad cycles an Errc display with a moving dash.^[1][2]

Likely causes

• I/O board or option card not seated
• Loose connector

First checks, in this order

1. Switch off, wait for the charge lamp to go out, then reseat the I/O board or option card and its connectors.

OPt: Option Trip-1

What it means: Communication error between the drive and an installed communication option card.^[1][2]

Likely causes

• Option card loose or faulty
• Network problem on the option card side

First checks, in this order

1. Reseat the option card with power off.
2. Check the network cable and master.
3. Check Pr.80 (Opt Trip Mode).

OLOr: Option Lost Command

What it means: A frequency or run command from a communication option was lost during operation (S100 name: Lost Opt Cmd). Active when Pr.68 (G100) or Pr.67 (S100) is not 0. Level type.^[1][2]

Likely causes

• Fieldbus master stopped or disconnected
• Network cable fault

First checks, in this order

1. Check the fieldbus master and cable.
2. Check Pr.68 on the G100 or Pr.67 on the S100.

SFA: SFA Trip

What it means: Safe torque off: the safety input between SA and SC opened, so torque is cut and the motor coasts. On the S100 this is shown under Safety A(B) Err.^[1][2]

Likely causes

• Safety circuit opened (emergency stop, guard switch)
• Safety connector removed or wiring fault on SA

First checks, in this order

1. Check the safety circuit wired to SA and SC.
2. If the safety function is not used, refit the safety connector linking SA and SB to SC.
3. Press STOP/RESET after the circuit is closed.

SFb: SFB Trip

What it means: Safe torque off: the safety input between SB and SC opened. On the S100 this is shown under Safety A(B) Err.^[1][2]

Likely causes

• Safety circuit opened
• Safety connector removed or wiring fault on SB

First checks, in this order

1. Check the safety circuit wired to SB and SC.
2. If only one channel opened, look for a wiring fault in that channel.
3. Press STOP/RESET after the circuit is closed.

rOt: Relay Open Trip

What it means: The DC voltage relay did not operate when power was applied. LS says it is detected only on 1.5, 2.2 and 4.0 kW 400 V G100 units and is not provided on the G100C.^[2]

Likely causes

• Internal DC voltage relay fault

First checks, in this order

1. Switch off, wait for the charge lamp to go out, and switch on again.
2. If it repeats, contact LS ELECTRIC service.

Otd1: Over torque trip1

What it means: Output current went above the torque detection 1 level (OU.68). Active when OU.67 is set to 3 or 4.^[2]

Likely causes

• Jammed or overloaded machine
• Detection level set too low

First checks, in this order

1. Check the machine for jams or extra load.
2. Check OU.67, OU.68 and OU.69 (delay).

Otd2: Over torque trip2

What it means: Output current went above the torque detection 2 level (OU.71). Active when OU.70 is set to 3 or 4.^[2]

Likely causes

• Jammed or overloaded machine
• Detection level set too low

First checks, in this order

1. Check the machine for jams or extra load.
2. Check OU.70, OU.71 and OU.72 (delay).

Utd1: Under torque trip1

What it means: Output current fell below the torque detection 1 level (OU.68). Active when OU.67 is set to 7 or 8.^[2]

Likely causes

• Load lost: broken belt, coupling or shaft
• Detection level set too high

First checks, in this order

1. Check belts, couplings and the driven machine.
2. Check OU.67, OU.68 and OU.69.

Utd2: Under torque trip2

What it means: Output current fell below the torque detection 2 level (OU.71). Active when OU.70 is set to 7 or 8.^[2]

Likely causes

• Load lost: broken belt, coupling or shaft
• Detection level set too high

First checks, in this order

1. Check belts, couplings and the driven machine.
2. Check OU.70, OU.71 and OU.72.

bb: Base Block

What it means: Output blocked by a multi-function input set to 33 (Base Block). Level type.^[2]

Likely causes

• Base block input turned on by the control system

First checks, in this order

1. Find which input in In.65 to In.72 is set to 33 and check what drives it.

OH: Overheat Pre-Alarm

What it means: The drive temperature went above the user set pre-overheat level (Pr.77). With Pr.78 at 2 (Free-Run) or 3 (Dec) it trips; with Pr.78 at 1 it only warns and keeps running.^[2]

Likely causes

• Cooling problem or high ambient temperature
• Pr.77 set low (range 90 to 110 °C)

First checks, in this order

1. Check the fan, vents and cabinet temperature.
2. Check Pr.77 and Pr.78.

PtC: PTC Trip

What it means: The motor temperature sensor (PTC or PT1000 on terminal I2) stayed above its trip point for 60 seconds. With Pr.34 at 1 (Warning) the keypad flashes a PTC warning and the drive keeps running.^[2]

Likely causes

• Motor overheated
• Sensor wiring fault or wrong sensor type setting
• SW3 not set to PTC

First checks, in this order

1. Check the motor load and cooling.
2. Check the sensor wiring between I2 and CM and that SW3 is set to PTC.
3. Check Pr.34 (PTC Trip Sel), Pr.35 (sensor type) and Pr.37 (trip temperature, PT1000 only).

SPd: Speed Dev Trip

What it means: The speed error went above the set level. Active when Pr.73 is set to 1.^[1]

Likely causes

• Motor cannot follow the speed command (overload, jam)
• Acceleration or deceleration too fast for the load
• Motor parameters not matched

First checks, in this order

1. Check the load and mechanics.
2. Increase ACC and dEC.
3. Check the motor parameters and Pr.73.

PtCt: PTC Trip

What it means: The motor PTC sensor value was exceeded or the sensor circuit failed.^[1]

Likely causes

• Motor overheated
• PTC sensor or wiring fault

First checks, in this order

1. Check the motor load and cooling.
2. Check the PTC wiring to the analog input used for it (V1 or I2).

ALOr: BLE App. Lost

What it means: The Bluetooth (BLE) connection between the drive and the phone app was lost. Only active when CM.97 is not 0. Level type.^[1]

Likely causes

• Phone moved out of range or app closed during control

First checks, in this order

1. Reconnect the phone.
2. Set CM.97 to 0 if this protection is not wanted.

PAr: ParaWrite Trip

What it means: Communication failed while parameters were being written from the LCD keypad.^[1]

Likely causes

• Keypad control cable fault
• Bad keypad connection

First checks, in this order

1. Check and reseat the keypad cable, then write the parameters again.

OLW: Over Load

What it means: Motor overload warning: current stayed above Pr.18 (OL Warn Level) for Pr.19 (OL Warn Time). The drive keeps running.^[1][2]

Likely causes

• Motor load near or above its rating

First checks, in this order

1. Check the load.
2. Check Pr.17 (OL Warn Select), Pr.18 and Pr.19.
3. Set OU.31 or OU.33 to 5 (Over Load) to get a relay signal.

ULW: Under Load

What it means: Motor underload warning. Active when Pr.25 is set to 1.^[1][2]

Likely causes

• Load lighter than expected: belt slip, dry pump

First checks, in this order

1. Check the driven machine.
2. Check Pr.25 and Pr.26.
3. Set OU.31 or OU.33 to 7 (Under Load) for a relay signal.

IOLW: INV Over Load

What it means: Drive overload warning: 60% of the inverter overload (IOL) allowance has built up, for example 150% current for 36 seconds.^[1][2]

Likely causes

• Drive running near its overload limit

First checks, in this order

1. Reduce the load or the duty cycle before IOL trips.
2. Set OU.31 or OU.33 to 6 (IOL) for a relay signal.

LCW: Lost Command

What it means: Lost command warning based on the conditions in Pr.13 to Pr.15. It appears even when Pr.12 is 0.^[1][2]

Likely causes

• Analog reference or communication command lost or weak

First checks, in this order

1. Check the reference signal and communication link.
2. Check Pr.13 to Pr.15.
3. Set OU.31 or OU.33 to 13 (Lost Command) for a relay signal.

FAnW: Fan Warning

What it means: Cooling fan error detected with Pr.79 set to 1 (Warning); the drive keeps running. On the G100, Pr.79 = 2 warns below 90 °C heatsink temperature and trips above it.^[1][2]

Likely causes

• Fan blocked, unplugged or worn

First checks, in this order

1. Clean or replace the fan soon; running with a bad fan shortens drive life.
2. Set OU.31 or OU.33 to 8 (FAN Warning) for a relay signal.

EFAn: Fan Exchange

What it means: Fan replacement due: the fan usage in Pr.86 has reached the warning level in Pr.87 (the G100 counts against 43,200 hours).^[1][2]

Likely causes

• Fan has reached its planned life

First checks, in this order

1. Replace the cooling fan.
2. Reset the fan usage counter with Pr.88 set to 1 after replacement.
3. Set OU.31 or OU.33 to 37 (FAN Exchange) for a relay signal.

dbW: DB Warn %ED

What it means: The braking resistor duty (usage rate) went above the level set in Pr.66.^[1][2]

Likely causes

• Frequent or long braking
• Pr.66 set lower than the real braking duty

First checks, in this order

1. Check the braking cycle and resistor rating.
2. Check Pr.66; never set it above the resistor power rating, which can overheat it.

trEr: Retry Tr Tune

What it means: Rotor time constant (Tr) tuning, run with dr.9 set to 4, found Tr too low or too high.^[1][2]

Likely causes

• Wrong motor data or tuning disturbed

First checks, in this order

1. Check the motor nameplate data and run the tuning again.

SLP: PID Sleep

What it means: PID control has entered sleep mode. This is a status message, not a fault.^[1][2]

Likely causes

• Process demand low, PID sleep conditions met

First checks, in this order

1. Informational only; adjust the PID sleep and wake-up settings if the timing is wrong.

FIdL: Comm Idle Sts

What it means: The communication option sees the master controller in its Idle state.^[1][2]

Likely causes

• PLC or fieldbus master in idle or program mode

First checks, in this order

1. Put the master back in run mode and check the network.