5 Motor control (MCTRL)
5.8 Sensorless control for synchronous motors (SLPSM)
214
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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5.8.3 Basic settings
The following "Initial commissioning steps" must be performed to commission the sensorless
control for synchronous motors:
Initial commissioning steps
1 Select motor control:
C00006
= "3: SLPSM: Sensorless PSM"
2. Set the motor selection/motor data
• When selecting and parameterising the motor, the motor nameplate data and the equivalent circuit
diagram data are relevant. Detailed information can be found in the "Motor selection/Motor data
"
chapter. ( 135)
Depending on the motor manufacturer, proceed as follows:
Lenze motor:
Selecting a motor from the motor catalogue in the
»Engineer«
- or -
1.Set the motor nameplate data
2.Automatic motor data identification
Third party manufacturer's motor:
1.Set the motor nameplate data
2.Automatic motor data identification
or set known
equivalent circuit diagram manually:
C00084
: Motor stator resistance
C00085
: Motor stator leakage inductance
3. Set speed switching thresholds between open-loop and closed-loop controlled operation:
• Set transition speed from closed-loop to open-loop operation in C00996/1
in [%] with regard to the rated
motor speed (C00087
).
• Set transition speed from closed-loop to open-loop operation in C00996/2
in [%] with regard to the rated
motor speed (C00087
).
Tip!
• With voltage-adjusted motors, a speed switching threshold of 10 % is recommended.
• As a rule of thumb, the speed switching threshold should be selected as follows:
4. Set open-loop accelerating current in C00995/1
in [%] with regard to the rated motor current (C00088).
• This value defines the height of the current that is injected during the acceleration process.
• The accelerating current must be dimensioned so that the required torque in the lower speed range can
always be reached (acceleration torque + load torque):
5th Set open-loop steady-state current in C00995/2
in [%] with regard to the rated motor current (C00088).
• This value defines the height of the current for processes without acceleration (e.g. standstill or constant
setpoint speed ).
6. For improving the operating characteristics:
If required, adapt the filter time for reconstructing the rotor position and the actual speed value through the
motor model in C00998/1
and C00998/2.
• We recommend using the Lenze setting:
Filter time rotor position (C00998/1
) = 3 ms
Filter time actual speed value (C00998/2
) = 5 ms
• Deviant from this, the following value range can be used:
Filter time rotor position (C00998/1
) = 2...5ms
Filter time actual speed value (C00998/2
) = 3...8ms
6. For protecting the motor from demagnetisation:
Set the ultimate current in C00939
.
Note!
The Lenze settings of the current controller are predefined for a power-adapted motor.
For an optimal drive behaviour of a synchronous motor, we recommend to adapt the
controller settings.
C00996/1...2 [%]
U
Rated, motor
[V]
U
Rated, FI
[V]
---------------------------------------
10⋅=
C00995/1 [%]
M
Meax
[Nm]
M
Rated
[Nm]
-------------------------------
I
Rated, motor
[A] 1.3⋅⋅=
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