Siemens SINAMICS G120 Operating Instructions Manual page 380

Alarms, faults and system messages
11.5 List of alarms and faults
Number Cause
F07801 Motor overcurrent
A07805 Drive: Power unit overload I2t
F07806 Regenerative power limit exceeded Increase deceleration ramp.
F07807 Short-circuit detected
A07850 External alarm 1 ... 3
A07851
A07852
F07860 External fault 1 ... 3
F07861
F07862
F07900 Motor blocked
F07901 Motor overspeed
F07902 Motor stalled
A07903 Motor speed deviation
380
Remedy
Check current limits (p0640).
Vector control: Check current controller (p1715, p1717).
U/f control: Check the current limiting controller (p1340 ... p1346).
Increase acceleration ramp (p1120) or reduce load.
Check motor and motor cables for short-circuit and ground fault.
Check the motor regarding the star/delta connection and rating plate
parameterization.
Check power unit / motor combination.
Select 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 driving load.
Use 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 this fault.
Check that the motor can run freely.
Check the torque limits (r1538 and r1539).
Check the parameters of the "Motor blocked" message (p2175, p2177).
Activate the precontrol for the speed limiting controller (p1401 bit 7 = 1).
Increase hysteresis for overspeed signal p2162.
Check whether the motor data has been set correctly and perform a
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.
Increase p2163 and/or p2166.
Increase the torque, current and power limits.
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
Converter with the CU250S-2 Control Unit (vector)