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Functions and Parameters
Fig. 12-13: Torque profile of reciprocating load
From the torque profile, the drive will work partly at motoring mode and partly
at generating mode. In generating mode, the drive tends to be overvoltage of DC
bus capacitor, in order to suppress the overvoltage, actual output frequency to
the motor has to be adapted with the load torque.
In EFCx610, this is realized by adjusting the effective slip compensation factor
when in generating mode via C0.23, so the resulting slip compensation factor
will be:
Fig. 12-14: Calculation formula
1. This overvoltage suppression mode only works in V/f control.
2. Proper parameters setting for C0.23 depends on the load. Dur-
ing commissioning, if the actual output frequency still can not
catch up with real mechanical velocity which can trigger over-
voltage error, E0.08 and E0.09 might be adjusted since these
will limit the actual output frequency.
3. This overvoltage suppression function cannot be used to short-
en the actual deceleration time on application with large loads,
so it is strongly recommended to set stop mode (E0.50) to 1
(freewheeling to stop 1).
4. This overvoltage suppression mode is NOT active when the out-
put frequency is at upper limit (E0.09). This is because this
function needs frequency space room to adjust.
Bosch Rexroth AG R912005854_Edition 09
Rexroth Frequency Converter EFC x610
Series
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