Actual signals and parameters 227
DC MAGN The drive pre-magnetizes the motor with DC current before
the start. The pre-magnetizing time is defined by parameter
2103 DC MAGN TIME.
If parameter 9904 MOTOR CTRL MODE value is VECTOR:
SPEED or VECTOR: TORQ, DC magnetizing guarantees
the highest possible break-away torque when the pre-
magnetizing is set long enough.
Note: Starting the drive connected to a rotating motor is not
possible when DC MAGN is selected. When a permanent
magnet synchronous motor is used, alarm MOTOR BACK
EMF (2029) is generated.
WARNING! The drive will start after the set pre-
magnetizing time has passed even if the motor
magnetization is not completed. In applications where a full
break-away torque is essential, always ensure that the
constant magnetizing time is long enough to allow
generation of full magnetization and torque.
2
TORQ BOOST Torque boost should be selected if a high break-away
torque is required. Used only when parameter 9904
MOTOR CTRL MODE setting is SCALAR: FREQ.
The drive pre-magnetizes the motor with DC current before
the start. The pre-magnetizing time is defined by parameter
2103 DC MAGN TIME.
Torque boost is applied at start. Torque boost is stopped
when output frequency exceeds 20 Hz or when it is equal to
the reference value. See parameter 2110 TORQ BOOST
CURR.
Note: Starting the drive connected to a rotating motor is not
possible when TORQ BOOST is selected.
WARNING! The drive will start after the set pre-
magnetizing time has passed although the motor
magnetization is not completed. In applications where a full
break-away torque is essential, always ensure that the
constant magnetizing time is long enough to allow
generation of full magnetization and torque.
4
SCAN START Frequency scanning flying start (starting the drive
connected to a rotating motor). Based on frequency
scanning (interval 2008 MAXIMUM FREQ…2007 MINIMUM
FREQ) to identify the frequency. If frequency identification
fails, DC magnetization is used (see selection DC MAGN).
Not for multimotor drives.
6
All parameters
No. Name/Value Description Def/FbEq
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