Siemens SINAMICS G120 Operating Instructions Manual page 389

Number Cause
A07400 DC-link voltage maximum controller
active
A07409 U/f control, current limiting control‐
ler active
F07426 Technology controller actual value
limited
A07444 PID autotuning is activated
F07445 PID autotuning canceled
F07801 Motor overcurrent
A07805 Drive: Power unit overload I2t
F07806 Regenerative power limit exceeded Increase the deceleration ramp.
F07807 Short-circuit detected
A07850 External alarm 1 ... 3
A07851
A07852
F07860 External fault 1 ... 3
F07861
F07862
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
Remedy
If it is not desirable that the controller intervenes:
● Increase the ramp-down times.
● Deactivate the Vdc_max control (p1240 = 0 for vector control, p1280 =
0 for U/f control).
The alarm automatically disappears after one of the following measures:
● Increase the current limit (p0640).
● Reduce the load.
● Slow down the ramp-ups for the setpoint speed.
● Adapt the limits to the signal level (p2267, p2268).
● Check the actual value scaling (p2264).
Automatic setting of the PID controller (autotuning) is active (p2350 > 0).
The alarm disappears automatically after completion of the autotuning.
The inverter has canceled the automatic setting of the PID controller (au‐
totuning) because of a fault.
Remedy: Increase p2355 and restart autotuning.
Check the current limits (p0640).
Vector control: Check the current controller (p1715, p1717).
U/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 the motor regarding the star/delta connection and type plate param‐
eterization.
Check the power unit / motor combination.
Select the flying restart function (p1200) if switched to rotating motor.
● Reduce the continuous load.
● Adapt the load cycle.
● Check the assignment of rated currents of the motor and power unit.
Reduce the driving load.
Use a power unit with higher energy recovery capability.
For vector control, the regenerative power limit in p1531 can be reduced
until the fault is no longer activated.
● Check the inverter connection on the motor side for any phase-phase
short-circuit.
● Rule out that line and motor cables have been interchanged.
The signal for "external alarm 1" has been triggered.
Parameters p2112, p2116 and p2117 determine the signal sources for the
external alarm 1... 3.
Remedy: Remove the causes of these alarms.
Remove the external causes for these faults.
Alarms, faults and system messages
8.6 List of alarms and faults
389