
66 Program features
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
Parameters
(page
(page
) and
).
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
. When both 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
.
When the reference exceeds parameter
, normal drive operation continues.
Settings and diagnostics
Parameters
(page
)
and
(page
).
Events: -
Reference
Motor speed
DC hold
t
t
ACS180 FW.book Page 66 Tuesday, March 9, 2021 2:25 PM