BONFIGLIOLI active cube 201

12/16
Operating Instructions ACU
207
Operation mode overvoltage control,
Voltage controller: Parameter Operation Mode 670 = 1
Ud
Ud, f
681
f
t
421 or 423
680
Overvoltage controller active
The overvoltage controller prevents a switch-off of the frequency inverter in generator operation.
The reduction of the drive speed by a ramp gradient selected via the parameter Deceleration
(Clockwise) 421 and Deceleration Anticlockwise 423 can lead to an overvoltage in the DC link. If
the voltage exceeds the figure set by the parameter Reference DC-Link Limitation 680, the
deceleration is reduced in such a way that the DC link voltage is regulated to the set value. If the DC
link voltage cannot be regulated to the set reference value by the reduction of the deceleration, the
deceleration is stopped and the output frequency raised. The output frequency is calculated by
addition of the parameter value Max. Frequency Rise 681 to the frequency at the operating point of
the controller intervention.
Parameter
Setting
No.
Description
ACU
Min.
Max.
Factory setting
680
Reference DC link
limitation
201
225.0 V
387.5 V
380.0 V
401
425.0 V
775.0 V
760.0 V
501
550.0 V
875.0 V
860.0 V
601
725.0 V
1175.0 V
1160.0 V
681
max. frequency rise
all
0.00 Hz
599.00 Hz
10.00 Hz
For reliable operation of the overvoltage control, Bonfiglioli Vectron MDS GmbH recommends setting
the motor chopper Trigger Threshold 507 < ( Reference DC-Link Limitation 680 – 10 V) . Refer to
Chapter 19.7.1 "19.7.1".