Siemens SINAMICS G110 Fault Codes

F0001: Overcurrent

What it means: The output current went above the inverter limit, so the G110 switched off to protect its power stage.^{[1][2][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Drive response: STOP II

Likely causes

• Motor power (P0307) does not match the inverter power (r0206)
• Short circuit in the motor cable or motor
• Earth fault in the motor or motor cable (on an ungrounded supply, an output phase shorted to ground can trip F0001)
• Ramp-up too short, starting boost too high, or the motor is blocked or overloaded

First checks, in this order

1. Compare motor power P0307 with inverter power r0206.
2. Check the motor cable and motor for short circuits and earth faults.
3. Keep motor cable length within limits: 25 m screened (10 m for filtered frame size A) or 50 m unscreened.
4. Check that the motor data match the rating plate and that stator resistance P0350 is correct.
5. Make sure the motor is not blocked or overloaded.
6. Increase ramp-up time P1120 and reduce starting boost P1312.
7. Read fault value r0949: 0 means a hardware trip, 1 a software trip.

F0002: Overvoltage

What it means: The DC link voltage rose too high, usually because the motor fed energy back into the drive while slowing down or while being driven by the load.^{[1][2][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Drive response: STOP II

Likely causes

• Mains supply voltage too high
• Motor in regenerative mode: ramp-down too fast or an active load driving the motor
• High load inertia for the set ramp-down time

First checks, in this order

1. Check that the supply voltage is within the rating plate limits (200 V to 240 V single phase, plus or minus 10%).
2. Make sure the Vdc controller is enabled (P1240 = 1, the factory setting).
3. Increase ramp-down time P1121 to match the load inertia; higher inertia needs longer ramps.
4. Check that the required braking power is within the drive limits.
5. Read fault value r0949: 0 means a hardware trip, 1 a software trip.

F0003: Undervoltage

What it means: The supply, and with it the DC link voltage, dropped too low, so the inverter switched off.^{[1][2][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Drive response: STOP II

Likely causes

• Mains supply failed or dipped
• Shock load outside the specified limits

First checks, in this order

1. Check the supply voltage at the mains input terminals.
2. Watch the DC link voltage r0026 while the load changes.
3. Read fault value r0949: 0 hardware trip, 1 software trip at undervoltage state, 2 software trip at the internal nominal state.

A0501: Current Limit

What it means: The output current has reached the current limit (r0067), so the drive is limiting current while it keeps running.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named Current limit value)

Likely causes

• Motor power does not match the inverter power
• Motor leads too long
• Earth fault
• Motor overloaded or blocked, ramp-up too short or starting boost too high

First checks, in this order

1. Compare motor power P0307 with inverter power r0206.
2. Check cable lengths and look for short circuits or earth faults in the motor cable and motor.
3. Check that the motor parameters and stator resistance P0350 are correct.
4. Increase ramp-up time P1120 and reduce starting boost P1312.
5. Compare actual output current r0027 with the output current limit r0067.

F0004: Inverter Over Temperature

What it means: The inverter got too hot and tripped.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named Inverter overtemperature)

Drive response: STOP II

Likely causes

• Inverter overloaded or load duty cycle too high
• Ventilation inadequate
• Pulse frequency set too high
• Ambient temperature too high

First checks, in this order

1. Check the load and the load duty cycle.
2. Check that motor power P0307 matches inverter power r0206.
3. Set pulse frequency P1800 back to its default value (8 kHz).
4. Check the ambient temperature and the air flow and clearance around the inverter.
5. Check P0290, the overload reaction: 0 (factory setting) reduces output frequency first, 1 trips straight away.

F0005: Inverter I2T

What it means: The inverter overload model (I2t) reached its limit: the drive carried too much current for too long.^{[1][2][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Drive response: STOP II

Likely causes

• Inverter overloaded
• Duty cycle too demanding
• Motor power (P0307) exceeds the inverter power capability (r0206)

First checks, in this order

1. Check that the load duty cycle is within the inverter rating: 150% of rated output current for 60 s, then 85% for 240 s, in a 300 s cycle.
2. Check that motor power P0307 matches inverter power r0206.
3. Check P0290 (inverter overload reaction).

F0011: Motor Over Temperature I2T

What it means: The motor thermal model (I2t) calculates that the motor is too hot, so the drive tripped to protect it.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 (same code and name); on the MICROMASTER 440 the same code is named Motor overtemperature

Drive response: STOP II

Likely causes

• Motor overloaded or load duty cycle too high
• Motor thermal time constant P0611 or warning level P0614 set wrong

First checks, in this order

1. Check the load and the load duty cycle.
2. Check motor I2t time constant P0611 against the motor maker's data.
3. Check warning level P0614; the trip comes at 110% of this level.
4. Watch the calculated motor temperature r0034.
5. Check P0610. On firmware 1.0 and 1.1 the factory setting is 2 (warning, then trip F0011). From software V1.2 the factory setting is 6 (warning, trip F0011, motor temperature saved at power down); 4 and 5 are the other saving options.

A0502: Overvoltage Limit

What it means: The DC link voltage has reached the overvoltage limit, typically during ramp-down.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named Overvoltage limit value)

Likely causes

• Vdc controller disabled (P1240 = 0) while ramping down
• Supply voltage too high

First checks, in this order

1. If the alarm stays on permanently, check the drive input voltage.
2. Check P1240; with 1 the Vdc-max controller lengthens the ramp-down to hold the DC link voltage.
3. Increase ramp-down time P1121.

A0911: Vdc-max Controller active

What it means: The Vdc-max controller is holding the DC link voltage (r0026) within limits by automatically making the ramp-down longer.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Likely causes

• Ramp-down time P1121 too short for the load inertia
• Supply voltage near the upper limit

First checks, in this order

1. Check that the supply voltage is within the rating plate limits.
2. Increase ramp-down time P1121 to match the load inertia.
3. Monitor the DC link voltage r0026.

A0503: Undervoltage Limit

What it means: The mains supply, and with it the DC link voltage (r0026), has dropped below the set limit.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named Undervoltage limit value)

Likely causes

• Mains supply failed
• Supply voltage too low

First checks, in this order

1. Check the mains supply voltage.
2. Monitor r0026 while the load changes.

A0505: Inverter I2T

What it means: The inverter overload (I2t) warning level is exceeded; this warning comes before an F0005 trip.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Likely causes

• Load duty cycle too high for the inverter rating

First checks, in this order

1. Check that the duty cycle is within the inverter limits.
2. Check P0290: 0 reduces output frequency, 1 trips with F0004 or F0005.
3. Reduce the load if the alarm keeps returning.

A0511: Motor Over Temperature I2T

What it means: The calculated motor temperature has reached the warning level P0614; the motor is running hot.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 (same code and name); on the MICROMASTER 440 the same code is named Motor overtemperature

Likely causes

• Motor overloaded
• Load duty cycle too high
• P0611 or P0614 set wrong

First checks, in this order

1. Set P0611 (motor I2t time constant) to a suitable value.
2. Set P0614 (motor I2t overload warning level) to a suitable level.
3. Watch the calculated motor temperature r0034.
4. Check P0610: 0 warning only, 1 warning and current limit reduction, 2 warning then trip F0011 (the factory setting on firmware 1.0 and 1.1). From software V1.2 the factory setting is 6 (warning, trip F0011, motor temperature saved at power down); 4 and 5 are the other saving options.

F0085: External Fault

What it means: A digital input set to External trip has reported a fault from outside equipment.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Drive response: STOP II

Likely causes

• An external device wired to a digital input has tripped
• Wiring fault on that input

First checks, in this order

1. Find the digital input set to 29 (External trip) in P0701 to P0704.
2. Check the external device and its wiring.
3. Read the digital input states in r0722.
4. If the input is not needed for fault triggering, disable it.

F0072: USS Setpoint Fault

What it means: On the USS variant, no setpoint arrived from the USS master within the telegram off time.^{[1][2][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named USS(COMM link) setpoint fault)

Drive response: STOP II

Likely causes

• USS master stopped sending or lost its connection
• RS485 wiring fault on terminals 8 and 9
• Baud rate or address not matching the master
• Telegram off time P2014 too short for the bus

First checks, in this order

1. Check the USS master.
2. Check the RS485 wiring on terminals 8 and 9.
3. Check USS baud rate P2010 and USS address P2011 against the master settings.
4. Check telegram off time P2014 (0 switches the watchdog off).

A0910: Vdc-max Controller de-activated

What it means: The Vdc-max controller has switched itself off because it could not keep the DC link voltage within limits.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named Vdc-max controller disabled/switched-out)

Likely causes

• Mains supply voltage permanently too high
• Motor driven by an active load, putting it into regenerative mode
• Very high load inertia during ramp-down

First checks, in this order

1. Check that the input voltage is within range.
2. Check that the load matches the drive.
3. Increase ramp-down time P1121 for high inertia loads.

F0051: Parameter EEPROM Fault

What it means: Reading from or writing to the parameter memory (EEPROM) failed.^{[1][2][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Drive response: STOP II

Likely causes

• Read or write failure while accessing the EEPROM

First checks, in this order

1. Do a factory reset (P0010 = 30, then P0970 = 1) and set the parameters again.
2. If the fault returns, replace the drive.

F0052: Power Stack Fault

What it means: The inverter could not read its power stack information, or the data it read was invalid.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Drive response: STOP II

Likely causes

• Read failure or invalid data for the power stack information

First checks, in this order

1. Switch the power off and on to see whether the fault repeats.
2. If it repeats, replace the drive, which is the Siemens remedy.

F0060: Asic Timeout

What it means: Internal communication inside the inverter failed.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named Asic time slice overflow)

Drive response: STOP II

Likely causes

• Internal communications failure

First checks, in this order

1. Acknowledge the fault and watch whether it comes back.
2. Read fault value r0949: 0 generated by the ASIC, 1 software trip.
3. If the fault persists, change the inverter or contact Siemens service.

F0100: Watchdog Reset

What it means: The processor watchdog reset the inverter after a short power dip or a software error.^[1]

Drive response: STOP II

Likely causes

• Short power dip
• Software error

First checks, in this order

1. If it followed a short power dip, the inverter itself is fine: check the supply.
2. If it happens in normal operation with no loss of power, contact Siemens service.

F0101: Stack Overflow

What it means: The control firmware ran out of stack memory, which points to a software error or a processor failure.^[1][5][6]

Also on: MICROMASTER 420 and MICROMASTER 440 (same code and name)

Drive response: STOP II

Likely causes

• Software error
• Processor failure

First checks, in this order

1. Run the self test routines, which is the Siemens remedy.
2. If the fault keeps coming back after a power cycle, contact Siemens service.

A0920: ADC parameters not set properly

What it means: The analog input scaling parameters are set to identical values, which gives an illogical scaling.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named ADC parameters not correctly set)

Likely causes

• Two analog input scaling points set to the same value

First checks, in this order

1. Check analog input scaling P0757 (x1), P0758 (y1), P0759 (x2) and P0760 (y2).
2. Make sure the two input voltages P0757 and P0759 are different.

A0923: Both JOG Left and JOG Right are requested

What it means: JOG right and JOG left are both active at the same time, so the ramp function generator output frequency is frozen at its present value.^{[1][3][4][5][6]}

Also on: MICROMASTER 420 and MICROMASTER 440 (same code, named JOG counter-clockwise as well as JOG clockwise are requested)

Likely causes

• Both JOG commands given at once from the BOP or from digital inputs

First checks, in this order

1. Do not press JOG right and JOG left at the same time.
2. Check which digital inputs are set to 10 (JOG right) and 11 (JOG left) in P0701 to P0704, and check those signals in r0722.

F0055: BOP-EEPROM Fault

What it means: Saving parameters to the BOP memory failed during parameter cloning.^[1][2][4]

Drive response: STOP II

Likely causes

• Read or write failure on the BOP EEPROM while cloning

First checks, in this order

1. Repeat the upload (P0003 = 3, P0010 = 30, then P0802 = 1).
2. Do a factory reset and set the parameters again.
3. Replace the BOP if it keeps failing.

F0056: BOP not fitted

What it means: Parameter cloning was started without a BOP fitted to the inverter.^[1][2][4]

Drive response: STOP II

Likely causes

• Transfer started with P0802 or P0803 while no BOP was fitted

First checks, in this order

1. Fit the BOP and start the transfer again: P0010 = 30, then P0802 = 1 to upload to the BOP or P0803 = 1 to download from it.

F0057: BOP fault

What it means: Parameter cloning was tried with an empty or invalid BOP.^[1][2][4]

Drive response: STOP II

Likely causes

• Download started from an empty BOP
• Invalid BOP

First checks, in this order

1. Upload a parameter set to the BOP first (P0802 = 1), then download it (P0803 = 1).
2. Replace the BOP if the fault stays.

F0058: BOP contents incompatible

What it means: The parameter set on the BOP was created on another type of drive, so it cannot be cloned into the G110.^[1][2][4]

Drive response: STOP II

Likely causes

• BOP holds data uploaded from a different drive type

First checks, in this order

1. Upload to the BOP from a G110 first (P0010 = 30, P0802 = 1), then download.
2. If a transfer has failed, repeat it or do a factory reset.