Siemens SINAMICS G120XA - Power Unit: DC Link Voltage Undervoltage; Power Unit: Overload I2 T

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
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
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.
Notice:
This fault can only be acknowledged after the alarm threshold for alarm A05000 has been undershot.
See also: p1800 (Pulse frequency setpoint)
F30005 Power unit: Overload I2t
Reaction: OFF2
Acknowledge: IMMEDIATELY
Cause: The power unit was overloaded (r0036 = 100 %).
- the permissible rated power unit current was exceeded for an inadmissibly long time.
- the permissible load duty cycle was not maintained.
Fault value (r0949, interpret decimal):
I2t [100 % = 16384].
Warnings, faults and system messages
9.6 List of fault codes and alarm codes
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB 809