Cause: The "DC link capacitor forming" function was canceled with fault (r3382.3 = 1). The expected DC link voltage is out of
tolerance.
See also: p3380 (Forming activation/duration), r3382 (Forming status word)
Remedy: - check drive device (supply voltage, terminals, ...).
- set activation/duration again (p3380 > 0).
- restart forming (p0840 = 0/1 signal).
A07391 Drive: DC link capacitor forming active
Reaction: NONE
Acknowledge: NONE
Cause: The "DC link capacitor forming" function is active. The remaining time of the operation is displayed in parameter r3381.
See also: p3380 (Forming activation/duration)
Remedy: Not necessary.
The alarm is automatically withdrawn after forming has been completed (r3382.2 = 1).
See also: r3382 (Forming status word)
A07400 (N) Drive: DC link voltage maximum controller active
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.
A07401 (N) Drive: DC link voltage maximum controller deactivated
Reaction: NONE
Acknowledge: NONE
Cause: The Vdc_max controller can no longer maintain the DC link voltage (r0070) below the limit value (r1242, r1282) and was
therefore switched out (disabled).
- the line supply voltage is permanently higher than specified for the power unit.
- the motor is permanently in the regenerative mode as a result of a load that is driving the motor.
Remedy: - check whether the input voltage is within the permissible range (if required, increase the value in p0210).
- check whether the load duty cycle and load limits are within the permissible limits.
A07402 (N) Drive: DC link voltage minimum controller active
Reaction: NONE
Acknowledge: NONE
Cause: The DC link voltage controller has been activated as the lower switch-in threshold has been undershot (r1246, r1286).
The kinetic energy of the motor is used to buffer the DC link. The drive is therefore braked.
See also: r0056 (Status word, closed-loop control), p1240 (Vdc controller configuration (vector control)), p1280 (Vdc
controller configuration (U/f))
Remedy: The alarm disappears when power supply returns.
Warnings, faults and system messages
9.6 List of fault codes and alarm codes
SINAMICS G120XA converter
784 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
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