Siemens CU240B-2 Parameter Manual page 702

Faults and Alarms
List of Faults and Alarms
F07924 Drive: Torque/speed too high
Reaction: OFF1 (NONE, OFF2, OFF3)
Acknowledge: IMMEDIATELY
Cause: For p2193 = 1:
The torque deviates from the torque/speed envelope characteristic (too high).
For p2193 = 2:
The speed signal from the external encoder (refer to p3230) deviates from the speed (r2169) (too high).
Remedy: - check the connection between the motor and load.
- adapt the parameterization corresponding to the load.
F07925 Drive: Torque/speed out of tolerance
Reaction: OFF1 (NONE, OFF2, OFF3)
Acknowledge: IMMEDIATELY
Cause: For p2193 = 1:
The torque deviates from the torque/speed envelope characteristic.
For p2193 = 2:
The speed signal from the external encoder (refer to p3230) deviates from the speed (r2169).
Remedy: - check the connection between the motor and load.
- adapt the parameterization corresponding to the load.
A07927 DC braking active
Reaction: NONE
Acknowledge: NONE
Cause: The motor is braked with DC current. DC braking is active.
1)
A message with response DCBRK is active. The motor is braked with the braking current set in p1232 for the duration
set in in p1233. If the standstill threshold p1226 is undershot, then braking is prematurely canceled.
2)
DC braking has been activated at binector input p1230 with the DC braking set (p1230 = 4). Braking current p1232
is injected until this binector input becomes inactive.
Remedy: Not necessary.
The alarm automatically disappears once DC braking has been executed.
A07929 (F) Drive: No motor detected
Reaction: NONE
Acknowledge: NONE
Cause: The absolute current value is so small after enabling the inverter pulses that no motor is detected.
Note:
In the case of vector control and an induction motor, this alarm is followed by the fault F07902.
See also: p2179 (Output load identification current limit)
Remedy: - check the motor feeder cables.
- reduce the threshold value (p2179), e.g. for synchronous motors.
- check the voltage boost of the U/f control (p1310).
- carry out a standstill measurement to set the stator resistance (p0350).
F07935 (N) Drv: Motor holding brake detected
Reaction: NONE (OFF1, OFF2, OFF3)
Acknowledge: IMMEDIATELY
Cause: A motor holding brake was detected where the brake control has not been configured (p1215 = 0).
Fault value (r0949, decimal interpretation):
0:
The brake control configuration was set to "motor holding brake the same as sequence control" (p1215 = 1) (only
when commissioning for the first time).
1:
The brake control configuration was left at "No motor holding brake available" (p1215 = 0).
Remedy: For fault value = 0:
- No remedy required.
For fault value = 1:
- If required change the motor holding brake configuration (p1215 = 1, 2).
- If this fault value unexpectedly occurs, then the motor connections should be checked in order to rule out that they
have been interchanged.
See also: p1215 (Motor holding brake configuration)
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SINAMICS G120 / Control Units CU240B/E-2 Parameter Manual (LH11), 01/2011
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