BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual page 212

When an operation mode with motor chopper is selected, set the
507 < (
Reference DC-Link Limitation
per".
For synchronous motors (
activated to prevent damages to the motor. The other functions of the voltage control-
ler are not affected by this.
For asynchronous motors in V/f control (
function is not operative. The other functions of the voltage controller are not affected
by this.
The brake chopper is active dependent of the setting of
680. See chapter 18.4 "Brake Chopper and Brake Resistance" for parameterizing the
switching threshold.
Operation mode Overvoltage control,
Voltage controller: Parameter
Ud, f
680
Ud
f
The overvoltage controller prevents a switch-off of the frequency inverter in genera-
tor operation. The reduction of the drive speed by a ramp gradient selected via the
parameter
to an overvoltage in the DC link. If the voltage exceeds the figure set by the parame-
ter
Reference DC link limitation
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 decel-
eration is stopped and the output frequency raised. The output frequency is calculat-
ed by addition of the parameter value
the operating point of the controller intervention.
No.
680 Reference DC link limitation
681 Max. Frequency Rise
When an operation mode with motor chopper is selected, set the
507 < (
Reference DC-Link Limitation
per".
212
Configuration
Operation mode
Overvoltage controller active
421 or 423
Deceleration Clockwise
680, the deceleration is reduced in such a way that
Parameter
Description
Operating Instructions ACU
680 - 10 V). See chapter 18.7.1 "Motor Chop-
30 = 5xx), the motor chopper function is de-
30 = 1xx), the motor chopper
Configuration
Reference DC-Link Limitation
670 = 1
681
421 or
Deceleration Anticlockwise
Max. Frequency Rise
Settings
ACU Min.
201 225
401 425
201/401 0.00 Hz 999.99 Hz
680 - 10 V). See chapter 18.7.1 "Motor Chop-
Trigger Threshold
t
423 can lead
681 to the frequency at
Max. Fact. sett.
387.5 380 V
775 760 V
10.00 Hz
Trigger Threshold
06/13