Motor Identification; Settings; Power Loss Ride-Through - ABB ACS800 Series Firmware Manual

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Motor identification

The performance of Direct Torque Control is based on an accurate motor model
determined during the motor start-up.
A motor identification magnetization is automatically done the first time the start
command is given. During this first start-up, the motor is magnetized at zero speed
for several seconds to allow the motor model to be created. This identification
method is suitable for most applications. However, as previously stated, for winding
applications, a separate identification run must be performed.

Settings

Parameter

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 the
operation after the break if the main contactor remained closed.
T
M
(Nm)
160
120
80
40
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 supply 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.
Note: Cabinet assembled units equipped with main contactor option have a "hold
circuit" that keeps the contactor control circuit closed during a short supply break.
The allowed duration of the break is adjustable. The factory setting is five seconds.
Program features
.
99.10
f U
out DC
(Hz) (VDC)
80 520
60 390
40 260
20 130
1.6 4.8 8 11.2
= output frequency of the drive,
out
= 40 Hz). The intermediate circuit DC voltage drops to the
out
U
mains
U
DC
f
out
T
M
t (s)
14.4