telemecanique vfd fault code

Drive does not start, no fault displayed
• If the display does not light up, check the power supply to the drive.
• The assignment of the "Fast stop" or "Freewheel" functions will prevent the drive starting if the corresponding logic inputs are not powered up. The Altivar vfd then displays [Freewheel] (nSt) in freewheel stop and [Fast stop] (FSt) in fast stop.

This is normal since these functions are active at zero so that the drive will be stopped safely if there is a wire break.
• Make sure that the run command input or inputs are activated in accordance with the selected control mode ([2/3 wire control] (tCC) and [2 wire type] (tCt) parameters,)

• If an input is assigned to the limit switch function and this input is at zero, the drive can only be started up by sending a command for the opposite direction.

• If the reference channel or command channel is assigned to a communication bus, when the power supply is connected, the drive will display [Freewheel] (nSt) and remain in stop mode until the communication bus sends a command.

Faults, which cannot be reset automatically
The cause of the fault must be removed before resetting by turning off and then back on.
AnF, brF, ECF, EnF, SOF, SPF and tnF faults can also be reset remotely by means of a logic input or control bit ([Fault reset] (rSF) parameter).
AnF, EnF, InFA, InFb, SOF, SPF, and tnF faults can be inhibited and cleared remotely by means of a logic input or control bit ([Fault inhibit assign.] (InH) parameter).

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Drive state codes:
The display flashes when a value is stored.
Normal display, with no fault present and no startup:
- ACC: Acceleration
- CLI: Current limit
- CTL: Controlled stop on input phase loss
- DCB: DC injection braking in progress
- DEC: Deceleration
- FLU: Motor fluxing in progress
- FST: Fast stop
- NLP: No line power (no line supply on L1, L2, L3)
- NST: Freewheel stop
- OBR: Auto-adapted deceleration
- PRA: Power Removal function active (drive locked)
- RDY: Drive ready
- RUN: Drive running
- SOC: Controlled output cut in progress
- TUN: Auto-tuning in progress
- USA: Undervoltage alarm

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AI2F [AI2 input]
• Non-conforming signal on analog input AI2
• Check the wiring of analog input AI2 and the value of the signal.
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AnF [Load slipping]
• The encoder speed feedback does not match the reference
• Check the motor, gain and stability parameters.
• Add a braking resistor.
• Check the size of the motor/drive/load.
• Check the encoder’s mechanical coupling and its wiring.
• If the "torque control" function is used.
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bOF [DBR overload]
• The braking resistor is under excessive stress
• Check the size of the resistor and wait for it to cool down
• Check the [DB Resistor Power] (brP) and [DB Resistor value] (brU) parameters.
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brF [Brake feedback]
• The brake feedback contact does not match the brake logic control
• The brake does not stop the motor quickly enough (detected by measuring the speed on the "Pulse input" input).
• Check the feedback circuit and the brake logic control circuit
• Check the mechanical state of the brake
• Check the brake linings
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bUF [DB unit sh. Circuit]
• Short-circuit output from braking unit
• Braking unit not connected
• Check the wiring of the braking unit and the resistor.
• Check the braking resistor
• The monitoring of this fault must be disabled by the [Brake res. fault Mgt.] (bUb) parameter, if there is no resistor or braking unit connected to the drive, at and above 55 kW (75 HP) for Altivar vfd pppM3X and at and above 90 kW (120 HP) for Altivar vfd pppN4.
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CrF1 [Precharge]
• Charging relay control fault or charging resistor damaged
• Turn the drive off and then back on again
• Check the internal connections
• Inspect/repair the drive
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CrF2 [Thyr. soft charge]
• DC bus charging fault (thyristors)
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dCF [Differential curent Fault]
• Current difference between power block A and B (Altivar vfd EC71N4 ...M13N4 or Altivar vfd EM12Y...M20Y only)
• Check thyristor with [TEST THYRISTORS]
• Check IGBT with [TRANSISTOR TEST]
• Check current transformer
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ECF [Encoder coupling]
• Break in encoder’s mechanical coupling
• Check the encoder’s mechanical coupling
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EEF1 [Control Eeprom]
• Internal memory fault, control card
• Check the environment (electromagnetic compatibility)
• Turn off, reset, return to factory settings
• Inspect/repair the drive EEF2 [Power Eeprom]
• Internal memory fault, power card
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EnF [Encoder]

• Encoder feedback fault
• Check [Number of pulses] (PGI) and [Encoder type] (EnS).
• Check that the encoder’s mechanical and electrical operation, its power supply and connections are all correct
• If necessary, reverse the direction of rotation of the motor ([Output Ph rotation] (PHr) parameter) or the encoder signals
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FCF1 [Out. contact. stuck]
• The output contactor remains closed although the opening conditions have been met
• Check the contactor and its wiring
• Check the feedback circuit
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HdF [IGBT desaturation]
• Short-circuit or grounding at the drive output
• Check the cables connecting the drive to the motor, and the motor insulation.
• Perform the diagnostic tests via the [1.10 DIAGNOSTICS] menu.
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ILF [internal com. link]
• Communication fault between option card and drive
• Check the environment (electromagnetic compatibility)
• Check the connections
• Check that no more than 2 option cards (max. permitted) have been installed on the drive
• Replace the option card
• Inspect/repair the drive
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InF1 [Rating error]
• The power card is different from the card stored
• Check the reference of the power card
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InF2 [Incompatible PB]
• The power card is incompatible with the control card
• Check the reference of the power card and its compatibility.
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InF3 [Internal serial link]
• Communication fault between the internal cards
• Check the internal connections
• Inspect/repair the drive
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InF4 [Internal-mftg zone]
• Internal data inconsistent
• Recalibrate the drive (performed by Schneider Electric Product Support).
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InF6 [Internal - fault option]
• The option installed in the drive is not recognized
• Check the reference and compatibility of the option.
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InF7 [Internal-hard init.]
• Initialization of the drive is incomplete
• Turn off and reset.
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InF8 [Internal-ctrl supply]
• The control power supply is incorrect
• Check the control section power supply
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InF9 [Internal- I measure]
• The current measurements are incorrect
• Replace the current sensors or the power card.
• Inspect/repair the drive