Program features 77
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 DC current control. When
both the reference and motor speed drop below a certain level (parameter 21.09 DC
hold speed), the drive will stop generating sinusoidal current and start to inject DC
into the motor. The current is set by parameter 21.10 DC current reference. When the
reference exceeds parameter 21.09 DC hold speed, normal drive operation
continues.
Settings
Parameters 21.08 DC current control and 21.09 DC hold speed.
Post-magnetization
The function keeps the motor magnetized for a certain period (parameter 21.11 Post
magnetization time) after stopping. This is to prevent the machinery from moving
under load, for example before a mechanical brake can be applied. Post-
magnetization is activated by parameter 21.08 DC current control. The magnetization
current is set by parameter 21.10 DC current reference.
Note: Post-magnetization is only available when ramp stop is selected (see
parameter 21.03 Stop mode). Post-magnetization is only supported in vector control.
Settings
Parameters 21.03 Stop mode (page 148), 21.08 DC current control and 21.11 Pre-
heating input source.
Reference
Motor speed
DC hold
21.09 DC hold speed
t
t
To Next Page
Loading...
