Schneider ATV312 Solar Drive Fault Codes

Complete reference list of Schneider ATV312 Solar Pump Drive fault codes. Learn to troubleshoot MPPT errors, Undervoltage (USF) at sunset, and Dry Run protection.

Schneider ATV312 Solar Fault Codes Reference Table

Schneider ATV312 Solar Fault Codes Reference Table

Schneider ATV312 Solar Fault Codes Reference Table

Fault Code and Meaning Cause and Remedy
bLF[NETWORK FAULT] Cause:
  • Brake release current not reached.
  • Brake engage frequency bEn = nO (not adjusted) when brake logic bLC is assigned.
Remedy:
  • Check the drive/motor connection.
  • Check the motor windings.
  • Check the Ibr setting in the FUn- menu.
  • Carry out the recommended adjustment of bEn.
CrF[PRECHARGE FAULT] Cause:
Load relay control fault or charging resistor damaged. Remedy:
  • Replace the drive.
EEF[EEPROM FAULT] Cause:
Internal memory detected fault. Remedy:
  • Check the environment (electromagnetic compatibility).
  • Replace the drive.
IF1[INTERNAL FAULT] Cause:
Unknown range. Remedy:
  • Replace the drive.
  • Restart drive.
  • Contact local Schneider Electric representative.
IF2[INTERNAL FAULT] Cause:
  • MMI card not recognized.
  • MMI card incompatible.
  • Display missing.
Remedy:
  • Contact local Schneider Electric representative.
IF3[INTERNAL FAULT] Cause:
EEPROM detected fault. Remedy:
  • Replace the drive.
  • Contact local Schneider Electric representative.
IF4[INTERNAL FAULT] Cause:
Industrial EEPROM detected fault. Remedy:
  • Replace the drive.
  • Contact local Schneider Electric representative.
OCF[OVERCURRENT] Cause:
  • Incorrect parameters in the [SETTINGS] SEt- and [MOTOR CONTROL] drC- menus.
  • Inertia or load too high.
  • Mechanical locking.
Remedy:
  • Check parameters in [SETTINGS] SEt- and [MOTOR CONTROL] drC- menus.
  • Check the size of the motor/drive/load.
  • Check the state of the mechanism.
  • Check wiring isolation if wires are in the water.
SCF[MOTOR SHORT CIRCUIT] Cause:
  • Short-circuit or grounding at the drive output.
  • Significant ground leakage current at the drive output if several motors are connected in parallel.
Remedy:
  • Check the cables connecting the drive to the motor, and the motor insulation.
  • Reduce the switching frequency.
  • Connect chokes in series with the motor.
  • Check wiring isolation if wires are in the water.
SOF[OVERSPEED] Cause:
  • Speed instability.
  • Spinning load too important (load too high).
Remedy:
  • Check the motor, gain and stability parameters.
  • Add a braking resistor.
  • Check the size of the motor/drive/load.
CnF[NETWORK FAULT] Cause:
Communication detected fault on the communication card. Remedy:
  • Check the environment (electromagnetic compatibility).
  • Check the wiring.
  • Check the time-out.
  • Replace the option card.
  • See the [CANopen fault mgt] COL parameter to define the stop mode with a CnF.
COF[CANopen FAULT] Cause:
Interruption in communication on the CANopen bus. Remedy:
  • Check the communication bus.
  • Refer to the product documentation.
EPF[EXTERNAL FAULT] Cause:
Depending on user. Remedy:
  • Depending on user.
ILF[INTERNAL LINK FAULT] Cause:
Identification detected fault of the communication card by the drive. Remedy:
  • Check that the option card is compatible with the drive.
  • Replace the option card.
LFF[LOSS OF 4-20 mA] Cause:
Loss of the 4-20 mA reference on input AI3. Remedy:
  • Check the connection on input AI3.
ObF[OVERBRAKING] Cause:
Braking too sudden or Driving load. Remedy:
  • Increase the deceleration time.
  • Install a braking resistor if necessary.
  • See the [Dec ramp adapt] brA function if it is compatible with the application.
OHF[DRIVE OVERHEAT] Cause:
Drive temperature too high. Remedy:
  • Check the motor load, the drive ventilation and the environment.
  • Wait for the drive to cool down before restarting.
OLF[MOTOR OVERLOAD] Cause:
  • Triggered by excessive motor current.
  • [Cold stator resist.] rSC parameter value incorrect.
Remedy:
  • Check the [Mot. therm. current] ItH setting, of the motor thermal protection.
  • Check the motor load. Wait for the drive to cool before restarting.
  • Remeasure [Cold stator resist.] rSC.
OPF[MOTOR PHASE LOSS] Cause:
  • Loss of one phase at drive output.
  • Output contactor open.
  • Motor not connected or motor power too low.
  • Instantaneous instability in the motor current.
Remedy:
  • Check the connections from the drive to the motor.
  • If an output contactor is being used, set [Output Phase Loss] oPL to [Output cut] oAC ([FAULT MANAGEMENT] FLt- menu).
  • Test on a low-power motor or without a motor: In factory settings mode, motor output phase loss detection is active ([Output Phase Loss] oPL = [Yes] YES).
  • To check the drive in a test or maintenance environment without having to switch to a motor with the same rating as the drive, deactivate motor phase loss detection ([Output Phase Loss] oPL = [No] nO).
  • Check and optimize the [IR compensation] uFr, [Rated motor volt.] unS, and [Rated mot. current] nCr parameters.
  • Perform an [Auto-tuning] tUn operation.
OSF[MAINS OVERVOLTAGE] Cause:
  • Line voltage is too high.
  • Disturbed line supply.
Remedy:
  • Check the line voltage.
PHF

[INPUT PHASE LOSS]		 Cause:
Drive incorrectly supplied or a fuse blown; Failure of one phase; Three-phase ATV312 used on a single-phase line supply; Unbalanced load; This protection only operates with the drive on load.

Remedy:
  • Check the power connection and the fuses.
  • Reset.
  • Use a three-phase line supply.
  • Disable the detection by setting [Input phase loss] IPL = [No] nO ([FAULT MANAGEMENT] FLt- menu).
SLF

[MODBUS FAULT]		 Cause:
Interruption in communication on the Modbus bus; Remote display terminal enabled ([HMI command] LCC = [Yes] YES) and terminal disconnected.

Remedy:
  • Check the communication bus.
  • Refer to the relevant product documentation.
  • Check the link with the remote display terminal.
CFF

[INCORRECT CONFIG.]		 Cause:
The current configuration is inconsistent; Addition or removal of an option.

Remedy:
  • Return to factory settings or retrieve the backup configuration, if it is valid. See the [Restore config.] FCS parameter.
CFI

[INVALID CONFIG]		 Cause:
Invalid configuration; The configuration loaded in the drive via the serial link is inconsistent.

Remedy:
  • Check the configuration loaded previously.
  • Load a consistent configuration.
USF

[UNDERVOLTAGE]		 Cause:
Insufficient line supply; Transient voltage dip; Damaged precharge resistor.

Remedy:
  • Check the voltage and the voltage parameter. Tripping threshold in [UNDERVOLTAGE] USF.
  • ATV312••••M2: 160 V
  • ATV312••••M3: 160 V
  • ATV312••••N4: 300 V
  • Replace the drive.
LL

[Low Light]		 Cause:
Not enough power from photovoltaic arrays; Cloudy weather; Sunrise or sunset period.

Remedy:
Check the configuration of rPG/rIG and rPG2/rIG2 parameters.
If there is enough sunshine:
  • Clean up the photovoltaic arrays.
  • Check the installation requirements for the number of photovoltaic arrays to deliver enough power.
If there is not enough sunshine:
  • With many LL detected faults during sunrise and sunset: increase the value of [Light timeout restart] LItr.
tF

[Tank Full]		 Cause:
The tank is detected full.

Remedy:
If the tank is full:
  • No action to realize.
If the tank is not full:
  • Check the liquid probe connection.
  • Check LPt and LPtP parameters.
tSF

[Tank sensor detected fault]		 Cause:
Tank water sensor disconnected; Tank water sensor broken; Alarm threshold too low (LPtP value).

Remedy:
  • Check the liquid probe connection.
  • Check LPt and LPtP parameters.
ULF

[Underload detected fault]		 Cause:
Not enough water to pump; Pump blocked.

Remedy:
  • Check if the pumping water level is OK.
  • Check if the pump is blocked.
  • If there is enough water and the pump is not blocked: set [State Unld. function] SUL to AUtO.
 

Troubleshooting Solar-Specific Behaviors

The ATV312 Solar behaves differently than a grid-connected drive. Understanding the daily cycle is key to troubleshooting.

  • USF (Undervoltage Supply Fault): On a standard drive, this is a problem. On a solar drive, this is a daily occurrence. When the sun sets, the PV voltage drops below the threshold, and the drive displays USF. It is not a failure; it is simply waiting for sunrise.
  • MPPT Regulation: The drive constantly adjusts motor speed to match available sunlight. If the motor slows down significantly during cloud cover, this is the MPPT logic working, not a motor fault.
  • Dry Run Protection (ULF): The drive monitors the load. If the well runs dry, the motor load drops (Underload). The drive triggers ULF (Underload Fault) to pause pumping and protect the mechanics.

Frequently Asked Questions (FAQ)

Q: The drive shows “USF” every evening. Is it broken?

A: No. USF stands for Undervoltage Supply Fault.
In solar applications, this indicates the solar panel voltage has dropped too low to maintain the DC bus. The drive will automatically wake up and clear this code the next morning when the sun rises.

Q: What is the difference between ATV312 and ATV312 Solar?

A: The hardware is identical, but the Firmware is different.
The Solar version replaces the standard speed reference logic with an MPPT Regulator. It also allows direct DC connection to the power terminals without triggering an Input Phase Loss (PHF) fault (if configured correctly).

Q: How do I handle “OCF” (Overcurrent) on a Solar Pump?

A:
1. Cloudy Days: Rapid changes in sunlight can sometimes cause the MPPT to ramp too aggressively, causing an overcurrent trip. Adjust the PID/MPPT reaction times.
2. Sand/Grit: If the pump is new, there may be debris in the borehole causing high mechanical resistance.
3. Cable Length: Long submersible cables act like capacitors. Ensure you have an output reactor (dV/dt filter) installed.

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