Lenze L-force HighLine C 8400 Series Reference Manual page 202

8400 HighLine C | Reference manual
Motor control (MCTRL)
Sensorless control for synchronous motors (SLPSM)

Stop!
• The injection of a constant current may cause an unwanted heating of the
motor at controlled operation.
– We recommend using a temperature feedback via PTC or thermal contact.

Note!
Currently, the sensorless control does not contain a flying restart function that
enables a synchronisation of the controller to a rotating machine.
• Thus, we recommend taking measures for preventing overvoltages at
operation in generator mode (e.g. brake resistor).
• By any means, the delay time for the "DC-bus overvoltage" error trigger in
C00601/1
The motor model-based speed monitoring requires a rotating machine. Thus, the
operational performance of the sensorless control for synchronous motors is divided into
two categories:
1. Open-loop controlled operation (|n
– In the range of low speeds, the speed of a synchronous motor is not possible. Thus,
only an adjustable and constant current is injected that enables an acceleration.
2. Closed-loop controlled operation (|n
– In this range, the rotor flux position and the speed are reconstructed via an observer.
The control is carried out field-oriented. Only the current is injected that is needed for
the required torque.
1
2
Œ
[5-13] Operating ranges of the sensorless control for synchronous motors
202
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Motor temperature monitoring (PTC)
must be set to 0 s.
setpoint
M
0
3
 Ž  Œ
L
( 292)
| < n )
C00996
| > n )
setpoint C00996
 Operation in motor mode (CW rotation)
 Operation in generator mode (CCW rotation)
 Operation in motor mode (CCW rotation)
 Operation in generator mode (CW rotation)
Field weakening (in preparation)
Closed-loop controlled operation
Open-loop controlled operation
n
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011