ABB ACS880 Series, Firmware Manual

Page: 107 / 764

current is set by parameter 21.10 . When the reference exceeds parameter 21.9 ,
normal drive operation continues.
Motor speed
Reference
21.09
DC hold
t
t
Note:
• DC hold is only available in speed control in DTC motor control mode (see page
42 ).
• 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 )
after stopping. This is to prevent the machinery from moving under load, for
example before a mechanical brake can be applied. Postmagnetization is activated
by parameter
21.8 . The magnetization current and time are set by parameters 21.10
and 21.11 .
Note: Post-magnetization is only available when ramping is the selected stop
mode (see parameter
21.3 ).
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
Program features 107