Pole Position Identification Without Motion - Lenze L-force HighLine C 8400 Series Reference Manual

5.8.5

Pole position identification without motion

This function extension is available from version 11.00.00!
From version 11.00.00 and with sensorless control, the rotor displacement angle for
synchronous motors (SLPSM) is identified with every controller enable in the Lenze setting,
and thus a jerk in the machine after controller enable can be avoided.
The "pole position identification without motion" function is able to identify the electrical
rotor displacement angle with an accuracy of up to 10°. The identification takes 1 ... 15 ms,
depending on the motor. The function is preset in the Lenze setting so that in the majority
of cases no more settings have to be made. In order to obtain the same behaviour as
before, the function can be deactivated in C02874.
Short overview of the relevant parameters:
Parameter
C02874
C02872
C02875
C02870
C02871
C02873
Highlighted in grey = display parameter

Note!
In case of synchronous motors with a stator time constant < 1 ms, the pole
position identification is not executed since the resulting test current pulse
could exceed the permissible motor current.
• This, however, only affects very few synchronous motors with very low power
(e.g. Lenze motor MDSKS-020-13-300 with rated power of 40 W).
• A non-executed pole position identification can be recognised by the display
C02870
 The stator time constants can be calculated based on the following formula:
T [ms]
s
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011
Buy: www.ValinOnline.com | Phone 844-385-3099 | Email: CustomerService@valin.com
Info
Pole position identification
PLI: Adaptation of time duration "PLI active"
PLI: Adaptation of identification angle "PLI active"
PLI: Degree of optimisation
PLI: Identification time
PLI: Identified rotor displacement angle
= 0 % and C02871 = 0 ms.
T = stator time constant
S
L [mH]
ss L = Motor stator leakage inductance (C00085)
ss
= ------------------- -
R
[ ] Ω
R = Motor stator resistance (C00084)
s
s
L
8400 HighLine C | Reference manual
Sensorless control for synchronous motors (SLPSM)
Motor control (MCTRL)
Lenze setting
Value Unit
1: On
0
0 °
- %
- ms
- °
217