Number
Cause
Remedy
F07445
PID autotuning canceled
The inverter has canceled the automatic setting of the PID controller (auto‐
tuning) because of a fault.
Remedy: Increase p2355 and restart autotuning.
F07801
Motor overcurrent
Check current limits (p0640).
V/f control: Check the current limiting controller (p1340 … p1346).
Increase the acceleration ramp (p1120) or reduce the load.
Check the motor and motor cables for short-circuit and ground fault.
Check motor for star-delta connection and rating plate parameterization.
Check power unit / motor combination.
Select the flying restart function (p1200) if switched to rotating motor.
A07805
Drive: Power unit overload I2t
● Reduce the continuous load.
● Adapt the load cycle.
● Check the assignment of rated currents of the motor and power unit.
F07807
Short-circuit detected
● Check the inverter connection on the motor side for any phase-phase
short-circuit.
● Rule out that line and motor cables have been interchanged.
A07850
External alarm 1
The signal for "external alarm 1" has been triggered.
Parameter p2112 defines the signal source of the external alarm.
Remedy: Rectify the cause of this alarm.
F07860
External fault 1
Remove the external causes for this fault.
F07900
Motor blocked
● Make sure that the motor can rotate freely.
● Check the torque limit: r1538 for a positive direction of rotation; r1539 for
a negative direction of rotation.
F07901
Motor overspeed
Activate precontrol of the speed limiting controller (p1401 bit 7 = 1).
F07902
Motor stalled
Check whether the motor data has been parameterized correctly and perform
motor identification.
Check the current limits (p0640, r0067, r0289). If the current limits are too
low, the drive cannot be magnetized.
Check whether motor cables are disconnected during operation.
A07903
Motor speed deviation
Increase p2163 and/or p2166.
Increase the torque, current and power limits.
A07910
Motor overtemperature
Check the motor load.
Check the motor's ambient temperature.
Check the KTY84 or PT1000 sensor.
A07920
Torque/speed too low
The torque deviates from the torque/speed envelope curve.
● Check the connection between the motor and the load.
● Adapt the parameterization corresponding to the load.
A07921
Torque/speed too high
A07922
Torque/speed out of tolerance
F07923
Torque/speed too low
● Check the connection between the motor and the load.
● Adapt the parameterization corresponding to the load.
F07924
Torque/speed too high
A07927
DC braking active
Not required
A07980
Rotary measurement activated
Not required
A07981
No enabling for rotary measure‐
ment
Acknowledge pending faults.
Establish missing enables (see r00002, r0046).
Alarms, faults and system messages
8.5 List of alarms and faults
SINAMICS G120C converter
364
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
