Operating Instructions

4 Faults and alarms
4.2 List of faults and alarms
SINAMICS G120 CU230P-2 Control Units
698 List Manual (LH9), 04/2014, A5E33838102B AA
Remedy: Not necessary.
The alarm disappears when the motor is restarted automatically or when the motor is manually switched off.
F07330 Flying restart: Measured search current too low
Message class: Application / technological function faulted (17)
Reaction: OFF2 (NONE, OFF1)
Acknowledge: IMMEDIATELY
Cause: During a flying restart, it was identified that the search current reached is too low.
It is possible that the motor is not connected.
Remedy: Check the motor feeder cables.
F07331 Flying restart: Function not supported
Message class: Error in the parameterization / configuration / commissioning procedure (18)
Reaction: OFF2 (NONE, OFF1)
Acknowledge: IMMEDIATELY
Cause: It is not possible to power up with the motor rotating (no flying restart). In the following cases, the "flying restart"
function is not supported:
Perm.-magnet synch. motors (PEM): operation with U/f char. and sensorless vector control.
Remedy: De-activate the "flying restart" function (p1200 = 0).
A07353 Drive: DC quantity control deactivated
Message class: Motor overload (8)
Reaction: NONE
Acknowledge: NONE
Cause: The DC quantity control has deactivated itself.
The manipulated variable of the DC quantity control was at its limit.
Remedy: Optimize the DC quantity controller (Kp, Tn, bandwidth, PT2 filter).
Note:
After changing the corresponding parameters, the DC quantity control is re-enabled and the alarm is automatically
withdrawn.
See also: p3857 (DC quantity controller P gain), p3858 (DC quantity controller integral time)
A07400 (N) Drive: DC link voltage maximum controller active
Message class: Application / technological function faulted (17)
Reaction: NONE
Acknowledge: NONE
Cause: The DC link voltage controller has been activated because the upper switch-in threshold has been exceeded (r1242,
r1282).
The ramp-down times are automatically increased in order to maintain the DC link voltage (r0070) within the
permissible limits. There is a system deviation between the setpoint and actual speeds.
When the DC link voltage controller is switched out (disabled), this is the reason that the ramp-function generator
output is set to the speed actual value.
See also: r0056 (Status word, closed-loop control), p1240 (Vdc controller configuration (vector control)), p1280 (Vdc
controller configuration (U/f))
Remedy: If the controller is not to intervene:
- increase the ramp-down times.
- switch-off the Vdc_max controller (p1240 = 0 for vector control, p1280 = 0 for U/f control).
If the ramp-down times are not to be changed:
- use a chopper or regenerative feedback unit.