Siemens sinamics G120 Operating Instructions Manual page 421

Number Cause
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
A07904 External armature short-circuit:
"Closed" contactor feedback signal
missing
F07905 External armature short-circuit:
"Open" contactor feedback signal
missing
A07908 Internal armature short-circuit ac-
tive
F07909 Internal voltage protection: Deacti-
vation only active after POWER
ON
Converter with CU250S-2 Control Unit
Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
Remedy
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 mo-
tor 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.
When closing, the contactor feedback signal (p1235) did not signal
"closed" (r1239.1 = 1) within the monitoring time (p1236).
Check the following:
Has the contactor feedback signal been incorrectly connected
•
(p1235)?
Contactor feedback signal logic (r1239.1 = 1: "Closed", r1239.1 = 0:
•
"Open").
Increase the monitoring time (p1236).
When opening, the contactor feedback signal (p1235) did not signal
"open" (r1239.1 = 0) within the monitoring time (p1236).
Check the following:
Has the contactor feedback signal been incorrectly connected
•
(p1235)?
Contactor feedback signal logic (r1239.1 = 1: "Closed", r1239.1 = 0:
•
"Open").
Increase the monitoring time (p1236).
The motor is short-circuited via the power semiconductor (r1239.5 = 1).
The inverter has activated the "Internal voltage protection" function"
(p1231 = 3). Deactivation of the internal voltage protection (p1231 not
equal to 3) only becomes active after POWER ON.
Alarms, faults and system messages
9.5 List of alarms and faults
421