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current is set by parameter
. When the reference exceeds parameter
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
).
•
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
)
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
. The magnetization current and time are set by parameters
and
Note: Post-magnetization is only available when ramping is the selected stop
mode (see parameter
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
Содержание ACS880 Series
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