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 21.01 Start mode (page 152), 21.19 Scalar start mode (page 157) and
21.02 Magnetization time (page 153).
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 21.08. 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 21.10.
When the reference exceeds parameter 21.09, normal drive operation continues.
Settings and diagnostics
Parameters 21.08 DC current control (page 156), 21.09 DC hold speed (page 156)
and 21.10 DC current reference (page 156).
Events: -
Reference
Motor speed
DC hold
21.09 DC hold speed
t
t
ACS180 FW.book Page 66 Tuesday, March 9, 2021 2:25 PM
To Next Page
Loading...
