Voltage Control And Trip Limits - ABB ACS850 Manual

78 Program features
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.
T f U
M out DC
(Nm) (Hz) (V DC)
160 80 520
120 60 390
80 40 260
40 20 130
U = intermediate circuit voltage of the drive, f
DC
T = motor torque
M
Loss of supply voltage at nominal load (f
minimum limit. The controller keeps the voltage steady as long as the mains 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.

Voltage control and trip limits

The control and trip limits of the intermediate DC voltage regulator are relative either
to a supply voltage value provided by the user, or to an automatically-determined
supply voltage. The actual voltage used is shown by parameter
volt. The DC voltage (U
Automatic identification of the supply voltage is performed every time the drive is
powered on. Automatic identification can be disabled by parameter
SupplyVoltAutoId; the user can then define the voltage manually at parameter
Supply voltage.
1.6 4.8
= output frequency of the drive,
out
= 40 Hz). The intermediate circuit DC voltage drops to the
out
) equals 1.35 times this value.
DC
8 11.2
01.19 Used supply
47.03
U
mains
U
DC
f
out
T
M
t (s)
14.4
47.04