Danfoss VLT FC360 Drive Fault Codes List

Access the complete reference guide for Danfoss VLT FC 360 OEM drive fault codes. Learn to diagnose Overcurrent (Alarm 13), Safe Stop (Alarm 68), and use the MCT 10 software.

Danfoss FC 360 Fault Codes Reference Table

Fault Code	Cause & Solution
WARNING 2 Live zero error	Cause: This warning or alarm only appears if programmed in parameter 6-01 Live Zero Timeout Function. The signal on 1 of the analog inputs is less than 50% of the minimum value programmed for that input. Broken wiring or faulty device sending the signal can cause this condition. Troubleshooting: - Check connections on all the analog input terminals. Control card terminals 53 and 54 for signals, terminal 55 common. - Check that the frequency converter programming and switch settings match the analog signal type. - Perform the input terminal signal test.
ALARM 2 Live zero error	Cause: This warning or alarm only appears if programmed in parameter 6-01 Live Zero Timeout Function. The signal on 1 of the analog inputs is less than 50% of the minimum value programmed for that input. Broken wiring or faulty device sending the signal can cause this condition. Troubleshooting: - Check connections on all the analog input terminals. Control card terminals 53 and 54 for signals, terminal 55 common. - Check that the frequency converter programming and switch settings match the analog signal type. - Perform the input terminal signal test.
Warning 3 No motor	Cause: No motor has been connected to the output of the frequency converter.
WARNING 4 Mains phase loss	Cause: A phase is missing on the supply side, or the mains voltage imbalance is too high. This message also appears for a fault in the input rectifier. Options are programmed in parameter 14-12 Response to Mains Imbalance. Troubleshooting: - Check the supply voltage and supply currents to the frequency converter.
ALARM 4 Mains phase loss	Cause: A phase is missing on the supply side, or the mains voltage imbalance is too high. This message also appears for a fault in the input rectifier. Options are programmed in parameter 14-12 Response to Mains Imbalance. Troubleshooting: - Check the supply voltage and supply currents to the frequency converter.
WARNING 7 DC overvoltage	Cause: If the DC-link voltage exceeds the limit, the frequency converter trips after a time. Troubleshooting: - Extend the ramp time. - Change the ramp type.
ALARM 7 DC overvoltage	Cause: If the DC-link voltage exceeds the limit, the frequency converter trips after a time. Troubleshooting: - Extend the ramp time. - Change the ramp type.
WARNING 8 DC under voltage	Cause: If the DC-link voltage (DC-link) drops below the undervoltage limit, the frequency converter trips after a fixed time delay. The time delay varies with unit size. Troubleshooting: - Check that the supply voltage matches the frequency converter voltage. - Perform the input voltage test. - Perform the soft charge circuit test.
ALARM 8 DC under voltage	Cause: If the DC-link voltage (DC-link) drops below the undervoltage limit, the frequency converter trips after a fixed time delay. The time delay varies with unit size. Troubleshooting: - Check that the supply voltage matches the frequency converter voltage. - Perform the input voltage test. - Perform the soft charge circuit test.
WARNING 9 Inverter overload	Cause: The frequency converter is about to cut out because of an overload (too high current for too long). The counter for electronic, thermal inverter protection issues a warning at90% and trips at 100%, while giving an alarm. The frequency converter cannot be reset until the counter is below 0%. - The fault occurs when the frequency converter has run with more than 100% overload for too long. Troubleshooting: - Compare the output current shown on the LCP with the frequency converter rated current. - Compare the output current shown on the LCP with measured motor current. - Show the thermal frequency converter load on the LCP and monitor the value. When running above the frequency converter continuous current rating, the counter increases. When running below the frequency converter continuous current rating, the counter decreases.
ALARM 9 Inverter overload	Cause: The frequency converter is about to cut out because of an overload (too high current for too long). The counter for electronic, thermal inverter protection issues a warning at90% and trips at 100%, while giving an alarm. The frequency converter cannot be reset until the counter is below 0%. - The fault occurs when the frequency converter has run with more than 100% overload for too long. Troubleshooting: - Compare the output current shown on the LCP with the frequency converter rated current. - Compare the output current shown on the LCP with measured motor current. - Show the thermal frequency converter load on the LCP and monitor the value. When running above the frequency converter continuous current rating, the counter increases. When running below the frequency converter continuous current rating, the counter decreases.
WARNING 10 Motor overload temperature	Cause: According to the electronic thermal protection (ETR), the motor is too hot. Select whether the frequency converter issues a warning or an alarm when the counter reaches 100% in parameter 1-90 Motor Thermal Protection. The fault occurs when the motor runs with more than 100% overload for too long. Troubleshooting: • Check for motor overheating. • Check if the motor is mechanically overloaded. • Check that the motor current set in parameter 1-24 Motor Current is correct. • Ensure that motor data in parameters 1-20 to 1-25 is set correctly. • Running AMA in parameter 1-29 Automatic Motor Adaptation (AMA) tunes the frequency converter to the motor more accurately and reduces thermal loading.
ALARM 10 Motor overload temperature	Cause: According to the electronic thermal protection (ETR), the motor is too hot. Select whether the frequency converter issues a warning or an alarm when the counter reaches 100% in parameter 1-90 Motor Thermal Protection. The fault occurs when the motor runs with more than 100% overload for too long. Troubleshooting: • Check for motor overheating. • Check if the motor is mechanically overloaded. • Check that the motor current set in parameter 1-24 Motor Current is correct. • Ensure that motor data in parameters 1-20 to 1-25 is set correctly. • Running AMA in parameter 1-29 Automatic Motor Adaptation (AMA) tunes the frequency converter to the motor more accurately and reduces thermal loading.
WARNING 11 Motor thermistor over temp	Cause: Check whether the thermistor is disconnected. Select whether the frequency converter issues a warning or an alarm in parameter 1-90 Motor Thermal Protection. Troubleshooting: - Check for motor overheating. - Check if the motor is mechanically overloaded. - When using terminal 53 or 54, check that the thermistor is connected correctly between either terminal 53 or 54 (analog voltage input) and terminal 50 (+10 V supply). Also check that the terminal switch for 53 or 54 is set for voltage. - Check that parameter 1-93 Thermistor Resource selects terminal 53 or 54. - When using terminal 18, 19, 31, 32, or 33 (digital inputs), check that the thermistor is connected correctly between the digital input terminal used (digital input PNP only) and terminal 50. Selectthe terminal to use in parameter 1-93 Thermistor Resource.
ALARM 11 Motor thermistor over temp	Cause: Check whether the thermistor is disconnected. Select whether the frequency converter issues a warning or an alarm in parameter 1-90 Motor Thermal Protection. Troubleshooting: - Check for motor overheating. - Check if the motor is mechanically overloaded. - When using terminal 53 or 54, check that the thermistor is connected correctly between either terminal 53 or 54 (analog voltage input) and terminal 50 (+10 V supply). Also check that the terminal switch for 53 or 54 is set for voltage. - Check that parameter 1-93 Thermistor Resource selects terminal 53 or 54. - When using terminal 18, 19, 31, 32, or 33 (digital inputs), check that the thermistor is connected correctly between the digital input terminal used (digital input PNP only) and terminal 50. Selectthe terminal to use in parameter 1-93 Thermistor Resource.
WARNING 12 Torque limit	Cause: The torque has exceeded the value in parameter 4-16 Torque Limit Motor Mode or the value in parameter 4-17 Torque Limit Generator Mode. Parameter 14-25 Trip Delay at Torque Limit can change this warning from a warning-only condition to a warning followed by an alarm. Troubleshooting: - If the motor torque limit is exceeded during ramp-up, extend the ramp-up time. - If the generator torque limit is exceeded during ramp-down, extend the ramp-down time. - If torque limit occurs while running, increase the torque limit. Make sure that the system can operate safely at a higher torque. - Check the application for excessive current draw on the motor.
ALARM 12 Torque limit	Cause: The torque has exceeded the value in parameter 4-16 Torque Limit Motor Mode or the value in parameter 4-17 Torque Limit Generator Mode. Parameter 14-25 Trip Delay at Torque Limit can change this warning from a warning-only condition to a warning followed by an alarm. Troubleshooting: - If the motor torque limit is exceeded during ramp-up, extend the ramp-up time. - If the generator torque limit is exceeded during ramp-down, extend the ramp-down time. - If torque limit occurs while running, increase the torque limit. Make sure that the system can operate safely at a higher torque. - Check the application for excessive current draw on the motor.
WARNING 13 Over current	Cause: The inverter peak current limit (approximately 200% of the rated current) is exceeded. The warning lasts about 5 s, then the frequency converter trips and issues an alarm. Shock loading or fast acceleration with high-inertia loads can cause this fault. Troubleshooting: - Remove power and check if the motor shaft can be turned. - Check that the motor size matches the frequency converter. - Check parameters 1-20 to 1-25 for correct motor data.
ALARM 13 Over current	Cause: The inverter peak current limit (approximately 200% of the rated current) is exceeded. The warning lasts about 5 s, then the frequency converter trips and issues an alarm. Shock loading or fast acceleration with high-inertia loads can cause this fault. Troubleshooting: - Remove power and check if the motor shaft can be turned. - Check that the motor size matches the frequency converter. - Check parameters 1-20 to 1-25 for correct motor data.
ALARM 14 Earth (ground) fault	Cause: There is current from the output phases to ground, either in the cable between the frequency converter and the motor, or in the motor itself. Troubleshooting: - Remove power to the frequency converter and repair the ground fault. - Check for ground faults in the motor by measuring the resistance to ground of the motor cables and the motor with a megohmmeter.
ALARM 16 Short circuit	Cause: There is short-circuiting in the motor or motor wiring. - Remove power to the frequency converter and repair the short circuit. Solution: There is an hardware or software issue in drive. Need to repair or replace drive.
WARNING 17 Control word timeout	Cause: There is no communication to the frequency converter. The warning is only active when parameter 8-04 Control Word Timeout Function is NOT set to [0] Off. - If parameter 8-04 Control Word Timeout Function is set to [5] Stop and Trip, a warning appears. The frequency converter then ramps down until it trips, while giving an alarm. Parameter 8-03 Control Timeout Time could possibly be increased. Troubleshooting: - Check connections on the serial communication cable. - Increase parameter 8-03 Control Word Timeout Time. - Check the operation of the communication equipment. - Verify a proper installation based on EMC requirements.
ALARM 17 Control word timeout	Cause: There is no communication to the frequency converter. The warning is only active when parameter 8-04 Control Word Timeout Function is NOT set to [0] Off. - If parameter 8-04 Control Word Timeout Function is set to [5] Stop and Trip, a warning appears. The frequency converter then ramps down until it trips, while giving an alarm. Parameter 8-03 Control Timeout Time could possibly be increased. Troubleshooting: - Check connections on the serial communication cable. - Increase parameter 8-03 Control Word Timeout Time. - Check the operation of the communication equipment. - Verify a proper installation based on EMC requirements.
ALARM 18 Start failed	Cause: The speed cannot exceed the value set in parameter 1-78 Compressor Start Max Speed [Hz] during start within the allowed time, which is set in parameter 1-79 Compressor Start Max Time to Trip. The alarm may be caused by a blocked motor.
WARNING 25 Brake resistor short circuit	Cause: The brake resistor is monitored during start-up. If a short circuit occurs, the brake function is disabled and the alarm appears. The frequency converter is tripped. Troubleshooting: - Remove the power to the frequency converter and check the connection of the brake resistor.
WARNING 26 Brake resistor power limit	Cause: The power transmitted to the brake resistor is calculated as a mean value over the last 120 s of run time. The calculation is based on the DC-link voltage and the brake resistor value set in parameter 2-11 Brake Resistor (ohm). The warning is active when the dissipated braking power is higher than the value set in parameter 2-12 Brake Power Limit (kW). The frequency converter trips if the warning persists for 1200 s. Troubleshooting: - Decrease brake energy via lower speed or longer ramp time.
ALARM 26 Brake resistor power limit	Cause: The power transmitted to the brake resistor is calculated as a mean value over the last 120 s of run time. The calculation is based on the DC-link voltage and the brake resistor value set in parameter 2-11 Brake Resistor (ohm). The warning is active when the dissipated braking power is higher than the value set in parameter 2-12 Brake Power Limit (kW). The frequency converter trips if the warning persists for 1200 s. Troubleshooting: - Decrease brake energy via lower speed or longer ramp time.
WARNING 27 Brake chopper fault	Cause: The brake transistor is monitored during start-up. If a short circuit occurs, the brake function is disabled, and an alarm is issued. The frequency converter is tripped. Troubleshooting: - Remove the power to the frequency converter and remove the brake resistor.
ALARM 27 Brake chopper fault	Cause: The brake transistor is monitored during start-up. If a short circuit occurs, the brake function is disabled, and an alarm is issued. The frequency converter is tripped. Troubleshooting: - Remove the power to the frequency converter and remove the brake resistor.
WARNING 28 Brake check failed	Cause: The brake resistor is not connected or not working. Troubleshooting: - Check if brake resistor is connected or it is too large for the frequency converter.
ALARM 28 Brake check failed	Cause: The brake resistor is not connected or not working. Troubleshooting: - Check if brake resistor is connected or it is too large for the frequency converter.
ALARM 30 Motor phase U missing	Cause: Motor phase U between the frequency converter and the motor is missing. Troubleshooting: - Remove power from the frequency converter and check motor phase U.
ALARM 31 Motor phase V missing	Cause: Motor phase V between the frequency converter and the motor is missing. Troubleshooting: - Remove power from the frequency converter and check motor phase V.
ALARM 32 Motor phase W missing	Cause: Motor phase W between the frequency converter and the motor is missing. Troubleshooting: - Remove power from the frequency converter and check motor phase W.
WARNING 34 communication fault	Cause: The fieldbus on the communication option card is not working.
ALARM 34 communication fault	Cause: The fieldbus on the communication option card is not working.
ALARM 38 Internal fault	Cause: When an internal fault occurs, a code number is shown. Troubleshooting: See Table for the causes and solutions for different internal faults. - 140–142: Power board EEPROM data error. Upgrade the software in the frequency converter to the latest version. - 176: The firmware in the frequency converter does not match the frequency converter. Upgrade the software in the frequency converter to the latest version. - 256: Flash ROM checksum error. Upgrade the software in the frequency converter to the latest version. - 2304: Firmware mismatch between the control card and the power card. Upgrade the software in the frequency converter to the latest version. - 2560: Communication error between the control card and the power card. Upgrade the software in the frequency converter to the latest version. If the alarm occurs again, check the connection between the control card and the power card. - 3840: Serial flash version error. Upgrade the software in the frequency converter to the latest version. - 4608: Frequency converter power size error. Upgrade the software in the frequency converter to the latest version. If the alarm occurs again, contact a Danfoss supplier. - 5632: Option hardware version error. The hardware version of the option or the fieldbus variant is not compatible with the frequency converter software. - 5888: Option software version error. The software version of the option or the fieldbus variant is not compatible with the frequency converter software. Change either the fieldbus software or the frequency converter software. - 6144: The option is not supported. Check if the product supports this option. - 6400: Option combination error. Remove the option. - Other: Other internal faults. Power cycle the frequency converter.
WARNING 40 Overload of digital output terminal 27	Cause: Check the load connected to terminal 27 or remove the short-circuit connection. Check parameter 5-00 Digital I/O Mode and parameter 5-01 Terminal 27 Mode.
WARNING 41 Overload of digital output terminal 29	Cause: Check the load connected to terminal 29 or remove the short circuit connection. Check parameter 5-00 Digital I/O Mode and parameter 5-02 Terminal 29 Mode.
ALARM 46 Power card supply	Cause: The supply for the gate drive on the power card is out of range. It is generated by the switch mode supply (SMPS) on the power card. Troubleshooting: - Check for a defective power card.
WARNING 47 24 V supply low	Cause: The 24 V DC is measured on the control card.
ALARM 50 AMA calibration failed	Cause: A calibration error has occurred. Solution: There is an hardware or software issue in drive. Need to repair or replace drive.
ALARM 51 AMA check Unom and Inom	Cause: The settings for motor voltage, motor current, and motor power are wrong. Troubleshooting: - Check the settings in parameters 1-20 to 1-25.
ALARM 52 AMA low Inom	Cause: The motor current is too low. Troubleshooting: - Check the setting in parameter 1-24 Motor Current.
ALARM 53 AMA motor too big	Cause: The motor is too large for the AMA to operate.
ALARM 54 AMA motor too small	Cause: The motor is too small for the AMA to operate.
ALARM 55 AMA parameter out of range	Cause: The parameter values of the motor are outside of the acceptable range. The AMA does not run.
ALARM 56 AMA interrupted by user	Cause: The AMA is manually interrupted.
ALARM 57 AMA internal fault	Cause: Try to restart the AMA again. Repeated restarts can overheat the motor.
ALARM 58 Internal fault	Cause: Internal fault. Solution: There is an hardware or software issue in drive. Need to repair or replace drive.
WARNING 59 Current limit	Cause: The current is higher than the value in parameter 4-18 Current Limit. Troubleshooting: - Ensure that motor data in parameters 1-20 to 1-25 is set correctly. - Possibly increase the current limit. - Be sure that the system can operate safely at a higher limit.
ALARM 60 External interlock	Cause: A digital input signal indicates a fault condition external to the frequency converter. An external interlock has commanded the frequency converter to trip. Troubleshooting: - Clear the external fault condition. - To resume normal operation, apply 24 V DC to the terminal programmed for external interlock. - Reset the frequency converter.
WARNING 61 Feedback error	Cause: An error between calculated speed and speed measurement from feedback device. Troubleshooting: - Check the settings for warning/alarm/disabling in parameter 4-30 Motor Feedback Loss Function. - Set the tolerable error in parameter 4-31 Motor Feedback Speed Error. - Set the tolerable feedback loss time in parameter 4-32 Motor Feedback Loss Timeout.
ALARM 61 Feedback error	Cause: An error between calculated speed and speed measurement from feedback device. Troubleshooting: - Check the settings for warning/alarm/disabling in parameter 4-30 Motor Feedback Loss Function. - Set the tolerable error in parameter 4-31 Motor Feedback Speed Error. - Set the tolerable feedback loss time in parameter 4-32 Motor Feedback Loss Timeout.
ALARM 63 Mechanical brake low	Cause: The actual motor current has not exceeded the release brake current within the start delay time window.
WARNING 65 Control card over temperature	Cause: The cutout temperature of the control card has exceeded the upper limit. Troubleshooting: - Check that the ambient operating temperature is within the limits. - Check the fan operation. - Check the control card.
ALARM 65 Control card over temperature	Cause: The cutout temperature of the control card has exceeded the upper limit. Troubleshooting: - Check that the ambient operating temperature is within the limits. - Check the fan operation. - Check the control card.
ALARM 67 Option module configuration has changed	Cause: One or more options have either been added or removed since the last power-down. Check that the configuration change is intentional and reset the unit.
ALARM 68 Safe stop activated	Cause: Safe Torque Off (STO) is activated. If STO is in manual restart mode (default), to resume normal operation, apply 24 V DC to terminals 37 and 38 and initiate a reset signal (via fieldbus, digital I/O, or [Reset]/[Off Reset] key). If STO is in automatic restart mode, applying 24 V DC to terminals 37 and 38 automatically resumes the frequency converter to normal operation.
ALARM 69 Power card temperature	Cause: The cutout temperature of the power card has exceeded the upper limit. Troubleshooting: - Check that the ambient operating temperature is within limits. - Check fan operation. - Check the power card.
ALARM 80 Drive initialised to default value	Cause: Parameter settings are initialized to default settings after a manual reset. Troubleshooting: - To clear the alarm, reset the unit.
WARNING 87 Auto DC-Braking	Cause: Occurs in IT mains when the frequency converter coasts, and the DC voltage is higher than 830 V for 400 V units and 425 V for 200 V units. The motor consumes energy on the DC link. This function can be enabled/disabled in parameter 0-07 Auto DC Braking.
ALARM 88 Option detection	Cause: A new option configuration has been detected. Set parameter 14-89 Option Detection to [1] Enable Option Change, and power cycle the frequency converter to accept the new configuration.
ALARM 95 Broken belt	Cause: Torque is below the torque level set for no load, indicating a broken belt. Parameter 22-60 Broken Belt Function is set for alarm. Troubleshooting: - Troubleshoot the system and reset the frequency converter after clearing the fault.
ALARM 99 Locked Rotor	Cause: The rotor is blocked. It is only enabled for PM motor control. Troubleshooting: - Check if the motor shaft is locked. - Check if the start current triggers the current limit set in parameter 4-18 Current Limit. - Check if it increases the value in parameter 30-23 Locked Rotor Detection Time [s].
ALARM 126 Motor Rotating	Cause: During AMA start-up, the motor is rotating. It is only valid for PM motor. Troubleshooting: - Check if the motor is rotating before starting the AMA.
WARNING 127 Back EMF too High	Cause: This warning applies to PM motors only. When the back EMF exceeds 90% x Uinvmax (overvoltage threshold) and does not drop to a normal level within 5 s, this warning is reported. The warning remains until the back EMF returns to a normal level.
Alarm 35 Option fault	Cause: Fieldbus or option B detects internal errors.
Warning 36 Mains failure	Cause: This warning/alarm is only active if the supply voltage to the frequency converter is lost and parameter 14-10 Mains Failure is NOT set to [0] No Function.
Alarm 36 Mains failure	Cause: This warning/alarm is only active if the supply voltage to the frequency converter is lost and parameter 14-10 Mains Failure is NOT set to [0] No Function.
warning 90 Feedback monitor	Cause: A feedback fault is detected by option B.
alarm 90 Feedback monitor	Cause: A feedback fault is detected by option B.
alarm 101 Flow/pressure information missing	Cause: Flow/pressure information missing.
alarm 120 Position control fault	Cause: Position control fault.
alarm 250 New spare part	Cause: New spare part. This alarm comes when you change hardware.
alarm 251 New type code	Cause:  New type  code.
alarm 252 Tension limit	Cause: Tension limit
nw-run Not while running	Cause: Parameter can only be changed when the motor is stopped.
Err. A wrong password was entered	Cause: Occurs when using a wrong password for changing a password-protected parameter
Err 84	Cause: Communication between the LCP and the frequency converter is lost.
Err 85	Cause: The LCP key is disabled. One of the LCP keys is disabled in parameter group 0-4* LCP Keypad.
Err 86	Cause: Data copy failure: Occurs when data is copied from frequency converter to LCP, or from LCP to frequency converter (parameter 0-50 LCP Copy).
Err 87	Cause: Invalid LCP data: Occurs when data is being copied from LCP to frequency converter (parameter 0-50 LCP Copy).
Err 88	Cause: LCP data incompatible: Occurs when data is being copied from LCP to frequency converter (parameter 0-50 LCP Copy), typically because data is moved between frequency converters that have major software differences.
Err 89	Cause: An operation is issued via LCP to write a value to a parameter that is read-only.
Err 90	Cause: LCP, serial communication, or fieldbus communication attempts to update the same parameters at the same time.
Err 91	Cause: The parameter value that is input via the LCP is invalid.
Err 92	Cause: The parameter value that is input via the LCP exceeds limits.
Err 93	Cause: The LCP copy operation cannot be conducted when the frequency converter is running.
donE	Cause: A notification that the LCP Copy process is finished.
NWrun	Cause: The parameter cannot be changed while the frequency converter is running.
Err.	Cause: The password that is input via the LCP is incorrect.

 

How to Read FC 360 Faults via LCP & MCT 10

Diagnostics for the FC 360 are straightforward, utilizing the same tools as the premium FC 302 series. In 2026, efficient troubleshooting relies on these methods:

• LCP 102 (Graphical Panel): While the FC 360 often ships with a blind cover or numerical LCP 101, using the Graphical LCP 102 is highly recommended for diagnostics.
  • Info Button: Pressing [Info] when an alarm is active provides a text description and troubleshooting advice directly on the screen.
  • Alarm Log: Navigate to Parameter 15-30 to view the history of the last 10 faults, including timestamps and drive status at the moment of failure.
• MCT 10 (Motion Control Tool): Connect your PC via the USB port (located under the LCP cover). The FC 360 is fully supported by MCT 10, allowing you to view the Scope to analyze motor current stability before a trip occurs.
• Trip vs. Trip Lock:
  • Trip: The drive stops but can be reset remotely.
  • Trip Lock: A severe hardware protection (e.g., Short Circuit Alarm 16). The drive output is disabled, and you must cycle the mains power to reset the unit.

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Frequently Asked Questions (FAQ)

Q: What is the difference between Warning (W) and Alarm (AL)?

A:

• Warning (W): The drive detects an abnormal condition (e.g., Warning 12 “Torque Limit”) but continues to operate. This is your cue to reduce the load or check mechanics.
• Alarm (AL): The drive stops the motor immediately (Trip). The red status LED flashes.

Q: How do I reset a Danfoss FC 360 fault?

A:

1. Press the Reset button on the LCP.
2. Toggle the Digital Input configured for Reset (default is Terminal 27 or 29).
3. For Trip Lock faults, turn off the mains power, wait for the display to turn off, and power on again.

Q: What does “Alarm 68” (Safe Stop) mean?

A: The FC 360 features Safe Torque Off (STO).

• Alarm 68 indicates that the 24V safety signal on Terminal 37 is missing.
• Check your emergency stop button, door gate switch, or safety relay. If you are not using STO, ensure the factory jumper is installed between Terminal 12 (24V) and Terminal 37.

Q: Why does the drive show “Alarm 4” (Mains Phase Loss)?

A: This is common in factories with unstable grids.

• Check the input fuses on L1, L2, and L3.
• Measure the voltage balance between phases.
• If the load is very light, the drive might trigger a false phase loss detection; check Parameter 14-12 to adjust the detection logic.