Schneider ATV312 Drive Fault Codes

Complete reference list of Schneider Altivar 312 (ATV312) fault codes. Learn to interpret LED errors like nSt (Freewheel), OCF, and SCF on this popular general-purpose drive.

Schneider ATV312 Fault Codes Reference Table

Schneider ATV312 Fault Codes Reference Table

Schneider ATV312 Fault Codes Reference Table

Fault Code and Meaning Cause and Remedy
bLF

[BRAKE CONTROL FAULT]		 Cause:
  • Brake release current not reached.
  • Brake engage frequency threshold [Brake engage freq] (bEn) = [No] (nO) whereas the brake control [Brake assignment] (bLC) is assigned.
  • Loss of one phase at drive output.
  • Output contactor open.

Remedy:
  • Check the drive/motor connection.
  • Check the motor windings.
  • Check the [Brake release I FW] (Ibr) setting in the [APPLICATION FUNCT.] (FUn-) menu.
  • Apply the recommended settings for [Brake engage freq] (bEn).
CrF

[PRECHARGE FAULT]		 Cause:
Precharge relay control or damaged precharge resistor.

Remedy:
Replace the drive.
EEF

[EEPROM FAULT]		 Cause:
Internal memory issue.

Remedy:
  • Check the environment (electromagnetic compatibility).
  • Replace the drive.
IF1

[INTERNAL FAULT]		 Cause:
Unknown rating.

Remedy:
  • Replace the drive.
  • Restart the drive.
  • Contact a Schneider Electric representative.
IF2

[INTERNAL FAULT]		 Cause:
  • HMI card not recognized.
  • HMI card incompatible.
  • No display present.

Remedy:
  • Replace the drive.
  • Restart the drive.
  • Contact a Schneider Electric representative.
IF3

[INTERNAL FAULT]		 Cause:
EEPROM issue.

Remedy:
  • Replace the drive.
  • Restart the drive.
  • Contact a Schneider Electric representative.
IF4

[INTERNAL FAULT]		 Cause:
Industrial EEPROM issue.

Remedy:
  • Replace the drive.
  • Restart the drive.
  • Contact a Schneider Electric representative.
OCF / o.CF / OC.F

[OVERCURRENT]		 Cause:
  • Parameters in the [SETTINGS] (SEt-) and [MOTOR CONTROL] (drC-) menus are incorrect.
  • Inertia or load too high.
  • Mechanical locking.
  • Phase/Ground Motor short-circuit.
  • Impedant short-circuit.

Remedy:
  • Check the parameters in [SETTINGS] (SEt-) and [MOTOR CONTROL] (drC-).
  • Check the size of the motor/drive/load.
  • Check the state of the mechanism.
SCF

[MOTOR SHORT CIRCUIT]		 Cause:
  • Short-circuit at the drive output.
  • Significant ground leakage current at the drive output if several motors are connected in parallel.
  • Grounding at the drive output.

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.
SoF

[OVERSPEED]		 Cause:
  • Instability.
  • Driving 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.
CoF

[CANopen FAULT]		 Cause:
Interruption in communication on the CANopen bus.

Remedy:
  • Check the communication bus.
  • Refer to the relevant 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

[4-20mA LOSS]		 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.
  • Activate the [Dec ramp adapt.] (bra) function if 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 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).
  • Test on a low-power motor or without a motor: In factory settings mode, motor output phase loss detection is active. 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, and 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 (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).
SLF

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

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

[AUTO TUNING FAULT]		 Cause:
  • Special motor or motor whose power is not suitable for the drive.
  • Motor not connected to the drive.

Remedy:
  • Use the L ratio or the [Var. torque] (P) ratio (see [U/F mot 1 selected] (UFt)).
  • Check that the motor is present during auto-tuning.
  • If an output contactor is being used, close it during auto-tuning.
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
    ATV312....S6: 430 V
  • Replace the drive.
InIt

Initialization in progress		 Cause:
  • The microcontroller is initializing.
  • Search underway for communication configuration.

Remedy:
Wait for initialization to complete.
COM.E (Flashing)

Communication error		 Cause:
  • Time out detected fault (50 ms).
  • This message is displayed after 20 attempts at communication.

Remedy:
Check communication connections.
A-17 (Flashing)

Alarm button		 Cause:
  • A button has been held down for more than 10 seconds.
  • The keypad is disconnected.
  • The "keypad" wakes up when a button is pressed.

Remedy:
Release the button or check keypad connection.
cLr (Flashing)

Confirmation of detected fault reset		 Cause:
This is displayed when the STOP button is pressed once during a remote terminal detected fault.

Remedy:
None required (informational).
dEU.E (Flashing)

Drive disparity		 Cause:
The drive brand does not match that of the remote terminal.

Remedy:
Use a compatible remote terminal.
rOM.E (Flashing)

ROM anomaly		 Cause:
The remote terminal detects a ROM anomaly on the basis of checksum calculation.

Remedy:
Replace remote terminal.
rAM.E (Flashing)

RAM anomaly		 Cause:
The remote terminal detects a RAM anomaly.

Remedy:
Replace remote terminal.
CPU.E (Flashing)

Other detected faults		 Cause:
Other detected faults.

Remedy:
Check drive diagnostics.
 

How to Read ATV312 Faults & History

The ATV312 is navigated using the central “Jog Dial”. Understanding the difference between a “Blocking” fault and a “Status” code is critical.

  • Status vs. Faults: The ATV312 display often confuses new users.
    • rdY: Ready (Healthy, waiting for command).
    • nSt: Freewheel Stop (Healthy, but the motor is coasting or logic is preventing start).
    • OCF/SCF/InF: These are actual faults that stop operation and require a reset.
  • Fault History (LFt): To view the most recent fault, navigate to the SUP- (Monitoring) menu and find the LFt (Last Fault) parameter. It stores the code of the last trip even after power is cycled.
  • Auto-Tuning (tUn): Many performance faults (like SLF or OCF) can be resolved by performing an Auto-Tune. Navigate to drC- → tUn and set it to YES while the motor is cold and stopped.

Frequently Asked Questions (FAQ)

Q: Why does the screen say “nSt” and the motor won’t start?

A: nSt stands for Freewheel Stop. It is a status, not a failure.
Common Causes:
1. 2-Wire Control safety: You turned the power on while the Run Switch (LI1) was already closed. Cycle the switch Off and On.
2. Stop Input: A digital input configured as “Free Stop” (NST) is active (open circuit).
3. Local Mode: You pressed the red STOP button on the keypad, overriding the terminal commands.

Q: What is “CFF” (Configuration Fault)?

A: This often happens after replacing a drive or swapping the control board.
Meaning: The configuration parameters do not match the hardware options.
Fix: You usually need to perform a Factory Reset. Go to drC- → FCS and change it to InI (Initialize). Hold the enter button for 2 seconds.

Q: How do I distinguish between “OCF” and “SCF”?

A:
OCF (Overcurrent): The motor is drawing too much current (Mechanical load too high, ramp too short). This is a “Soft” fault.
SCF (Short Circuit): This is a “Hard” electrical fault.
SCF1: Short circuit at the motor output.
SCF3: Ground fault (Motor wire touching earth). Do not reset repeatedly; check cables with a megohmmeter.

Comments

Post a Comment

Popular posts from this blog

Allen Bradley Kinetix 5500 Drive Fault Codes List

Complete guide to Allen Bradley Kinetix 5500 fault codes. Troubleshoot FLT codes, Single-Cable (DSL) feedback errors, shared bus faults, and perform diagnostics via Studio 5000. Kinetix 5500 Fault Codes Reference Table Kinetix 5500 Fault Codes Reference Table Kinetix 5500 Fault Codes Reference Table Fault Code and Meaning Cause and Remedy FLT S03 – MTR OVERSPEED FL Motor Overspeed Factory Limit Fault Cause: Motor speed has exceeded 125% of its maximum speed. Remedy: Check control loop tuning. FLT S04 – MTR OVERSPEED UL Motor Overspeed User Limit Fault Cause: Motor speed has exceeded motor overspeed user limit. Remedy: Check control loop tuning. Increase the Motor Overspeed UL attribute value. FLT S05 – MTR OVERTEMP FL Motor Overtemperature Factory Limit Fault Cause: Calculations based ...
Read more

Danfoss VACON 100 FLOW Drive Fault Codes List

Access the complete reference guide for Danfoss VACON 100 FLOW drive fault codes. Learn to diagnose Multipump communication errors, dry run faults, and use Vacon Live software. VACON 100 FLOW Fault Codes Reference Table VACON 100 FLOW Faults and Alarms VACON 100 FLOW - Fault Tracing Fault Code and Meaning Cause and Remedy Fault Code 1, ID 1 Overcurrent (Hardware Fault) Cause: There is too high a current (> 4 × IH) in the motor cable. a sudden heavy load increase a short circuit in the motor cables the motor is not the correct type the parameter settings are not properly made Remedy: Check the loading. Check the motor. Check the cables and connections. Make an identification run. Set the acceleration time longer (P3.4.1.2 and P3.4.2.2). Fault Code 1, ID 2 Overcurrent (Software Fault...
Read more

ABB ACH580 Drive Fault Codes List

Access the complete reference guide for ABB ACH580 HVAC drive fault codes. Learn to diagnose issues via the Hand-Off-Auto panel, BACnet integration, and Fireman’s Override. The ABB ACH580 is the industry-standard flagship drive for HVACR applications. Designed to control air handling units, cooling towers, and chillers, it ensures critical comfort and safety in buildings. When a malfunction occurs, the dedicated Hand-Off-Auto (HOA) control panel displays a 4-digit code alongside plain-text diagnostics, often integrated directly into the Building Management System (BMS). This guide provides the most updated reference to help you interpret these codes and maintain building environmental standards. ACH580 Fault Codes Reference Table Use the search bar below or browse the table to identify your specific error code: ABB ACH580 Drive Fault Codes List ABB ACH580 Drive Fault Codes List Fault Code and Meaning Cause and Remedy A2B1...
Read more