Siemens SINAMICS G120 Operating Instructions Manual page 406
Low voltage inverters
built-in units with cu250s-2 control units and
encoder evaluation
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Also See for SINAMICS G120:
- List manual (1256 pages) ,
- Manual (732 pages) ,
- Operating instructions manual (550 pages)
Table of Contents
Alarms, faults and system messages
8.6 List of alarms and faults
Number
Cause
A07321
Automatic restart active
F07330
Search current measured too low
A07400
DC-link voltage maximum controller
active
F07403
Lower DC-link voltage threshold
reached
F07404
DC-link voltage monitoring V
A07409
V/f control, current limiting control‐
ler active
F07412
Commutation angle incorrect (mo‐
tor model)
F07413
Commutation angle incorrect (pole
position identification)
F07426
Technology controller actual value
limited
404
Remedy
Explanation: The automatic restart (AR) is active. During voltage recovery
and/or when remedying the causes of pending faults, the drive is automat‐
ically switched back on.
Increase the search current (p1202), check the motor connection.
If the controller is not to intervene:
● Increase the ramp-down time of the ramp-function generator (p1121,
p1135).
● Deactivate the Vdc_max controller.
Motor and inverter protection by limiting the voltage (Page 335)
The DC-link voltage monitoring is active (p1240 = 5, 6) and the lower
DC-link voltage threshold (p1248) was reached in the "Operation" state.
Check the following:
● Line voltage
● Infeed
Reduce the lower DC-link voltage threshold (p1248).
The DC-link voltage monitoring p1284 has responded.
DCmax
Check the following:
● Line voltage
● Braking resistor
● Device supply voltage (p210)
Increase the DC-link voltage threshold (p1284).
The alarm automatically disappears after one of the following measures:
● Increase the current limit (p0640).
● Reduce the load.
● Increase the ramp-up time to the speed setpoint.
An incorrect commutation angle can result in positive feedback in the speed
controller.
Check the motor phase sequence (wiring, p1820).
Adjust the encoder.
Replace the encoder.
Carry out motor data identification.
Carry out pole position identification.
An incorrect commutation angle can result in positive feedback in the speed
controller.
Check the motor phase sequence (wiring, p1820).
Adjust the encoder.
Replace the encoder.
Carry out pole position identification.
● Adapt the limits to the signal level (p2267, p2268).
● Check the actual value scaling (p2264).
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG
Converter with the CU250S-2 Control Units
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