Siemens SINAMICS G120 - F30002 Power unit: DC link voltage overvoltage; F30003 Power unit: DC link voltage undervoltage; F30004 Power unit: Overtemperature heat sink AC inverter

SINAMICS G120 Control Units CU240B-2/CU240E-2
List Manual (LH11), 01/2016, A5E33839529
857
4 Faults and alarms
4.2 List of faults and alarms
F30002 Power unit: DC link voltage overvoltage
Message class: DC-link overvoltage (4)
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 (Drive unit line supply voltage), p1240 (Vdc controller configuration (vector control))
F30003 Power unit: DC link voltage undervoltage
Message class: Infeed faulted (13)
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
Message class: Power electronics faulted (5)
Reaction: OFF2
Acknowledge: IMMEDIATELY
Cause: The temperature of the power unit heat sink has exceeded the permissible limit value.
- insufficient cooling, fan failure.
- overload.
- ambient temperature too high.
- pulse frequency too high.
Fault value (r0949, interpret decimal):
Temperature [1 bit = 0.01 °C].
Remedy: - check whether the fan is running.
- check the fan elements.
- check whether the ambient temperature is in the permissible range.
- check the motor load.
- reduce the pulse frequency if this is higher than the rated pulse frequency.