Operating Instructions ACU
18.2 Voltage controller
The voltage controller contains the functions necessary for monitoring the DC link voltage.
The DC link voltage which rises in generator operation or in the braking process of the 3-phase
machine is controlled to the set limit value by the voltage controller.
The power failure regulation uses the rotation energy of the drive to bridge short-term power
failures.
The voltage controller is set with the parameter Operation Mode 670 in accordance with the
application.
The function is switched off. Brake and motor chopper are active and
switch at the thresholds parameterized with P.506 and P.507.
DC link limitation active
Overvoltage controller switched on. Brake and motor chopper are
active and switch at the thresholds parameterized with P.506 and
P.507. Factory setting.
Mains failure regulation turned on. Brake and motor chopper are
active and switch at the thresholds parameterized with P.506 and
P.507. Can be used for quick shutdown.
Udc-Limit. &
Mains Supp. active
Overvoltage controller and power failure regulation switched on, with
motor chopper.
Mains support active,
without chopper
Mains failure regulation turned on. During mains support, the brake
and motor chopper are deactivated. In all other cases, the brake and
motor chopper are active and switch at the thresholds parameterized
with P.506 and P.507.
Udc-Limit. &
Mains Supp. active
without chopper
Overvoltage controller and power failure regulation switched on.
During mains support, the brake and motor chopper are deactivated.
In all other cases, the brake and motor chopper are active and
switch at the thresholds parameterized with P.506 and P.507.
In ACU 501 and 601, mains failure regulation is effected via the DC link capacitor for a
maximum of 1 second. In the case of long mains failures, mains failure regulation
cannot be guaranteed.
The function motor chopper is available in the field-oriented control methods (in configurations 210,
230, 410, 411 and 430).
When an operation mode with motor chopper is selected, set Trigger Threshold 507 < ( Reference
DC-Link Limitation 680 – 10 V ). See Chapter 19.7.1 "19.7.1".
For synchronous motors (Configuration 30=610), the motor chopper feature is
deactivated to prevent the motor from being damaged. The other functions of the
voltage controller are not affected by this.
For asynchronous motors in V/f control (Configuration 30=110), the motor chopper
feature is deactivated. The other functions of the voltage controller are not affected by
this.
The brake chopper is active depending on the setting of Operation Mode 670. For
parameterization of the switching threshold, refer to Chapter 19.4 "19.4".
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