Lenze EVF9331 - Behaviour in Case of Overvoltage in the DC Bus (OU Message)

Troubleshooting and fault elimination
Fault elimination
Behaviour in case of overvoltage in the DC bus (OU message)
4
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37
EDKVF93−03 EN 2.0
4.4.3 Behaviour in case of overvoltage in the DC bus (OU message)
Description
If the DC−bus voltage (U
DC
) exceeds the switch−off threshold OU, the pulse inhibit is set. At
the same time, an internal timing element starts for a delay time (C0912).
The pulse inhibit is deactivated if the voltage falls below the switch−on threshold OU and
the delay time has elapsed.
Switching thresholds in case of overvoltage in the DC bus (OU):
Mains voltage range C0173 Switch−off threshold OU Switch−on threshold OU
< 400 V Operation with / without
brake chopper
0 770 V 755 V
400 V Operation with / without
brake chopper
1
*
770 V 755 V
460 V Operation with / without
brake chopper
2 770 V 755 V
480 V Operation without brake
chopper
3 770 V 755 V
480 V Operation with brake
chopper
4 800 V 785 V
*
Lenze setting
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0912 OV delay time à − {1 ms} − Delay time of the pulse enable after
an OU message
à Depending on C0082, C0086,
C0087, C0088, C0089, C0090,
C0091, C0092
A change of one of the codes
resets C0912 to the time of the
selected motor
l The time is derived from the
double rotor time constant
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