Siemens SINAMICS G120 List Manual page 1117

A07929 (F) Drive: No motor detected
Message class: Application/technological function faulted (17)
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 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).
F07930 Drive: Brake control error
Message class: Application/technological function faulted (17)
Reaction: OFF1 (NONE, OFF2, OFF3)
Acknowledge: IMMEDIATELY
Cause: The Control Unit has detected a brake control error.
- motor cable is not correctly connected.
- motor cable is not shielded correctly.
- defect in the Safe Brake Module, in the Power Module or in the Control Unit.
Fault value (r0949, interpret decimal):
10, 11:
Fault in "open holding brake" operation.
- no brake connected or wire breakage (check whether brake opens for p1278 = 1).
- ground fault in brake cable.
20:
Fault in "brake open" state.
- short-circuit in brake winding.
30, 31:
Fault in "close holding brake" operation.
- no brake connected or wire breakage (check whether brake opens for p1278 = 1).
- short-circuit in brake winding.
40:
Fault in "brake closed" state.
50:
Fault in the brake control circuit of the Control Unit or communication error between processor 1 and processor 2
(brake control diagnostics).
See also: p1278 (Brake control diagnostics evaluation)
Remedy: - check the motor holding brake connection.
- check the function of the motor holding brake.
- check the Safe Brake Module connection.
- check that the electrical cabinet design and cable routing are in compliance with EMC regulations (e.g. shield of the
motor cable and brake conductors are connected with the shield connecting plate and the motor connectors are
tightly screwed to the housing).
- replace the Safe Brake Module.
- replace Power Module.
- replace the Control Unit.
See also: p1215 (Motor holding brake configuration), p1278 (Brake control diagnostics evaluation)
SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890
4 Faults and alarms
4.2 List of faults and alarms
1117