Siemens SINAMICS G120X - Power Unit: DC Link Voltage Overvoltage; Power Unit: DC Link Voltage Undervoltage

Remedy: - check the motor data - if required, carry out commissioning.
- check the motor circuit configuration (star/delta).
- U/f operation: Increase up ramp.
- U/f operation: Check assignment of rated currents of motor and power unit.
- check the line supply quality.
- reduce motor load.
- correct connection of line reactor.
- check the power cable connections.
- check the power cables for short-circuit or ground fault.
- check the length of the power cables.
- replace power unit.
- check the line supply phases.
F30002 Power unit: DC link voltage overvoltage
Reaction: OFF2
Acknowledge: IMMEDIATELY
Cause: The power unit has detected an overvoltage condition in the DC link.
- motor regenerates too much energy.
- line supply voltage too high.
- line phase interrupted.
- DC link voltage control switched off.
- dynamic response of DC link voltage controller excessive or insufficient.
Fault value (r0949, interpret decimal):
DC link voltage at the time of trip [0.1 V].
Remedy: -increase the ramp-down time (p1121).
- set the rounding times (p1130, p1136). This is particularly recommended in U/f operation to relieve the DC link voltage
controller with rapid ramp-down times of the ramp-function generator.
- Activate the DC link voltage controller (p1240, p1280).
- adapt the dynamic response of the DC link voltage controller (p1243, p1247, p1283, p1287).
- check the line supply and DC link voltage. set p0210 as low as possible (also see A07401, p1294 = 0).
- check and correct the phase assignment at the power unit.
- check the line supply phases.
See also: p0210, p1240
F30003 Power unit: DC link voltage undervoltage
Reaction: OFF2
Acknowledge: IMMEDIATELY
Cause: The power unit has detected an undervoltage condition in the DC link.
- line supply failure
- line supply voltage below the permissible value.
- line phase interrupted.
Note:
The monitoring threshold for the DC link undervoltage is the minimum of the following values:
- for a calculation, refer to p0210.
Remedy: - check the line supply voltage
- check the line supply phases.
See also: p0210 (Drive unit line supply voltage)
F30004 Power unit: Overtemperature heat sink AC inverter
Reaction: OFF2
Acknowledge: IMMEDIATELY
Warnings, faults and system messages
9.6 List of fault codes and alarm codes
SINAMICS G120X converter
1030 Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC