Dc Magnetization - ABB ACS280 Firmware Manual

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DC magnetization

The drive has different magnetization functions for different phases of motor
start/rotation/stop: pre-magnetization, DC hold, post-magnetization and pre-
heating (motor heating).
Pre-magnetization
Pre-magnetization refers to DC magnetization of the motor before start.
Depending on the selected start mode (vector or scalar) pre-magnetization can
be applied to guarantee the highest possible breakaway torque, up to 200% of
the nominal torque of the motor. By adjusting the pre-magnetization time, it is
possible to synchronize the motor start and, for example, the release of a
mechanical brake.
Settings and diagnostics
21.01 Start mode
Parameters
21.02 Magnetization time
Events: -
DC hold
The function makes it possible to lock the rotor at (near) zero speed in the
middle of normal operation. DC hold is activated by parameter
the reference and motor speed drop below a certain level, the drive will stop
generating sinusoidal current and start to inject DC into the motor. The current
is set by parameter
drive operation continues.
Motor speed
Reference
21.09 DC hold speed
136
(page
137
(page ).
21.10
. When the reference exceeds parameter
21.19 Scalar start mode
),
DC hold
Program features 51
142
(page ) and
21.08
. When both
21.09
, normal
t
t