Siemens SINAMICS G120 List Manual page 1109

- check the motor for the star-delta configuration and rating plate parameterization.
- check the power unit and motor combination.
- Choose "flying restart" function (p1200) if switched to rotating motor.
F07802 Drive: Infeed or power unit not ready
Message class: Infeed faulted (13)
Reaction: OFF2 (NONE)
Acknowledge: IMMEDIATELY
Cause: After an internal switch-on command, the infeed or drive does not signal ready.
- monitoring time is too short.
- DC link voltage is not present.
- associated infeed or drive of the signaling component is defective.
- supply voltage incorrectly set.
Remedy: - increase the monitoring time (p0857).
- ensure that there is a DC link voltage. Check the DC link busbar. Enable the infeed.
- replace the associated infeed or drive of the signaling component.
- check the line supply voltage setting (p0210).
See also: p0857 (Power unit monitoring time)
A07805 (N) Drive: Power unit overload I2t
Message class: Power electronics faulted (5)
Reaction: NONE
Acknowledge: NONE
Cause: Alarm threshold for I2t overload (p0294) of the power unit exceeded.
The response parameterized in p0290 becomes active.
See also: p0290 (Power unit overload response)
Remedy: - reduce the continuous load.
- adapt the load duty cycle.
- check the assignment of the motor and power unit rated currents.
F07806 Drive: Regenerative power limit exceeded (F3E)
Message class: Power electronics faulted (5)
Reaction: OFF2 (IASC/DCBRK)
Acknowledge: IMMEDIATELY
Cause: For blocksize power units, types PM250 and PM260, the regenerative rated power r0206[2] was exceeded for more
than 10 s.
See also: r0206 (Rated power unit power), p1531 (Power limit regenerative)
Remedy: - increase the down ramp.
- reduce the driving load.
- use a power unit with a higher regenerative feedback capability.
- for vector control, the regenerative power limit in p1531 can be reduced so that the fault is no longer triggered.
F07807 Drive: Short-circuit/ground fault detected
Message class: Ground fault / inter-phase short-circuit detected (7)
Reaction: OFF2 (NONE)
Acknowledge: IMMEDIATELY
Cause: A phase-phase short-circuit or ground fault was detected at the motor-side output terminals of the converter.
Fault value (r0949, interpret decimal):
1: Short-circuit, phase UV.
2: Short-circuit, phase UW.
3: Short-circuit, phase VW.
4: Ground fault with overcurrent.
1yxxx: Ground fault with current in phase U detected (y = pulse number, xxxx = component of the current in phase V
in per mille).
2yxxx: Ground fault with current in phase V detected (y = pulse number, xxxx = component of the current in phase U
in per mille).
SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890
4 Faults and alarms
4.2 List of faults and alarms
1109