Lenze EVF9324

Troubleshooting and fault elimination
Error elimination
BehaviourincaseofovervoltageintheDCbus(OUmessage)
9
9.4
9.4.3

9.4-3
EDSVF9333V EN 3.0-06/2005
9.4.3 Behaviour in case of overvoltage in the DC bus (OU message)
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 Æ - {1 ms} - Delay time of the pulse release
after an OU message
Æ 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
z Thetimeisderivedfromthe
double rotor time constant
 8.2-25
 8.2-48
 9.4-3
Description