80 Program features
DC voltage control
Overvoltage control
Overvoltage control of the intermediate DC link is typically needed when the motor is
in generating mode. The motor can generate when it decelerates or when the load
overhauls the motor shaft, causing the shaft to turn faster than the applied speed or
frequency. To prevent the DC voltage from exceeding the overvoltage control limit,
the overvoltage controller automatically decreases the generating torque when the
limit is reached.
Undervoltage control (power loss ride-through)
If the incoming supply voltage is cut off, the drive will continue to operate by utilizing
the kinetic energy of the rotating motor. The drive will be fully operational as long as
the motor rotates and generates energy to the drive. The drive can continue
operation after the break if the main contactor (if present) remained closed.
Note:
Units equipped with a main contactor must be equipped with a hold circuit (e.g.
UPS) to keep the contactor control circuit closed during a short supply break.
130
260
390
520
1.6
5.8
8
11.2
15.4
t
(s)
U
DC
f
out
T
M
U
DC
= Intermediate circuit voltage of the drive,
f
out
= Output frequency of the drive,
T
M
= Motor torque
Loss of supply voltage at nominal load (
f
out
= 40 Hz). The intermediate circuit DC voltage
drops to the minimum limit. The controller keeps the voltage steady as long as the input
power is switched off. The drive runs the motor in generator mode. The motor speed falls but
the drive is operational as long as the motor has enough kinetic energy.
U
input power
20
40
60
80
40
80
120
160
T
M
(N·m)
f
out
(Hz)
U
DC
(Vdc)
Summary of Contents for ACQ580
Page 1: ...ABB drives for water Firmware manual ACQ580 pump control program ...
Page 4: ... 2017 ABB Oy All Rights Reserved 3AXD50000035867 Rev C EN EFFECTIVE 2017 06 21 ...
Page 30: ...26 Start up control with I O and ID run ...
Page 40: ...36 Default configuration ...
Page 304: ...300 Parameters ...
Page 340: ...336 Additional parameter data ...
