Program features 73
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.
Parameters
Parameters: 21.08 DC current control, 21.09 DC hold speed and 21.10 DC current
reference
Post-magnetization
The function keeps the motor magnetized for a certain period 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. The
magnetization current is set by parameter 21.10.
Note: Post-magnetization is only available when ramping is the selected stop mode.
Parameters
Parameters: 21.01 Vector start mode, 21.02 Magnetization time, 21.03 Stop mode,
21.08 DC current control, 21.09 DC hold speed and 21.11 Post magnetization time.
Pre-heating (Motor heating)
The pre-heating function keeps the motor warm and prevents condensation inside the
motor by feeding it with DC current when the drive has been stopped. The heating
can only be activated when the drive is in the stopped state, and starting the drive
stops the heating.
The heating is started 60 seconds after zero speed has been reached or modulation
has been stopped to prevent excessive current if coast stop is used.
The function can be defined to be always active when the drive is stopped or it can be
activated by a digital input, fieldbus, timed function or supervision function. For
Reference
Motor speed
DC hold
21.09 DC hold speed
t
t
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