64 Program features
Notes:
• DC hold is only available in speed control in DTC motor control mode (see page
22).
• The function applies the DC current to one phase only, depending on the position
of the rotor. The return current will be shared between the other phases.
Post-magnetization
This feature 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 ramping is the selected stop mode
(see parameter 21.03 Stop mode).
Continuous magnetization
A digital signal, such as a user bit in the fieldbus control word, can be selected to
activate continuous magnetization. This can be especially useful in processes
requiring motors to be stopped (for example, to stand by until new material is
processed), then quickly started without magnetizing them first.
Notes:
• Continuous magnetization is only available in speed control in DTC motor control
mode (see page 22). If parameter 21.12 Continuous magnetization command is
on, the motor will be kept magnetized after a ramp stop. To enable continuous
magnetization after a coast stop, the command (21.12) must be cycled (on, off,
Reference
Motor speed
DC hold
21.09 DC hold speed
t
t
To Next Page
Loading...
