78 Program features
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.
Settings
Parameters
21.08
DC current control
(page
173
),
21.09
DC hold speed
(page
173
)
and
21.10
DC current reference
(page
173
).
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.
Settings
Parameters
21.01
Vector start mode
(page
169
),
21.02
Magnetization time
(page
170
),
21.03
Stop mode
(page
170
),
21.08
DC current control
(page
173
),
21.09
DC
hold speed
(page
173
) and
21.11
Post magnetization time
(page
173
).
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.
When pre-heating is activated and the stop command is given, pre-heating starts
immediately if the drive is running below the zero speed limit (see bit 0 in parameter
06.19
Speed control status word
). If the drive is running above the zero speed limit,
Reference
Motor speed
DC hold
21.09
DC hold speed
t
t
ACS380 FW.book Page 78 Friday, May 4, 2018 4:18 PM
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