Siemens SINAMICS G120 - A07400 (N) Drive: DC link voltage maximum controller active; A07401 (N) Drive: DC link voltage maximum controller de-activated; A07402 (N) Drive: DC link voltage minimum controller active; F07404 Drive: DC link voltage monitoring Vdc_max

SINAMICS G120 Control Units CU240B-2/CU240E-2
List Manual (LH11), 01/2016, A5E33839529
829
4 Faults and alarms
4.2 List of faults and alarms
Note:
PMSM: permanent-magnet synchronous motor
Remedy: De-activate the "flying restart" function (p1200 = 0).
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.
A07401 (N) Drive: DC link voltage maximum controller de-activated
Message class: Application/technological function faulted (17)
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
Message class: Application/technological function faulted (17)
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.
F07404 Drive: DC link voltage monitoring Vdc_max
Message class: DC-link overvoltage (4)
Reaction: OFF2 (NONE, OFF1, OFF3)
Acknowledge: IMMEDIATELY
Cause: The monitoring of the DC link voltage p1284 has responded (only U/f control).
Remedy: - check the line supply voltage.
- check the braking module.
- adapt the device supply voltage (p0210).
- adapt the DC link voltage monitoring (p1284).