Danfoss iC7 Motion Series Application Manual page 193

Application Guide | iC7 Series Motion
DC start is configured using 3 parameters, 5.6.2.3 DC Start Current %, 5.6.2.1 DC Start Time, and 5.6.2.2 DC Start Rise Time.
By default, DC start is disabled by setting parameter 5.6.2.1 DC Start Time to 0. The following illustration shows an example of starting an
induction at zero speed.
DC start is also used as a start delay by setting parameter 5.6.2.1 DC Start Time to the desired delay time and 5.6.2.3 DC Start Current %
to 0.
DC start is only applied when starting at zero speed, or when parameter 5.6.1.2 Enable Flying Start is set to 0 [Disable] and motor back-
emf voltage is not detected.
Synchronous motor control start settings
DC start is also possible from zero speed with synchronous motor control.
The following illustration shows a zero speed example with DC start and initial position handling as rotor angle detection. To set the
initial position handling to rotor angle detection, set parameter 5.6.3.1 Sync. Motor Start Mode to 0 [Rotor angle detection].
DC Start Current %
DC Start Rise Time
DC Start Time
DC stator current control
0
Figure 78: Synchronous Motor Start from Zero Speed with DC Start
As an alternative to rotor angle detection for a synchronous motor, it is possible to set the initial position handling as rotor angle parking
by setting parameter 5.6.3.1 Sync. Motor Start Mode to 1 [Rotor angle parking]. This option forces the motor shaft to move to a fixed
position defined by the parameter 5.6.3.5 Sync. Motor Parking Angle Reference, before ramp release.
Synchronous motor start from zero speed with DC-Start and parking is shown in the following illustration.
© 2023.11
Current
Speed
Time
Motor control
Run Request
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