Lenze 8400 TopLine - Manual (Page 365)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
365
6 Encoder/feedback system
6.5 Pole position identification (PPI)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Short overview of the relevant parameters:
• The stator time constants can be calculated based on the following formula:
Parameter Info Lenze setting
Value Unit
C02874 PLI without motion 0x1 (bit coded)
C02872 PLI without motion: Adaptation of time duration 0
C02875 PLI without motion: Adaptation of ident angle 0 °
C02870 PLI without motion: Optimisation factor - %
C02871 PLI without motion: Running time - ms
C02873 PPI without motion: Identified rotor displacement
angle
- °
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 = 0 % and C02871 = 0 ms.
T
S
= stator time constant
L
ss
= Motor stator leakage inductance ( C00085 )
R
s
= Motor stator resistance ( C00084 )
T
s
[ms]
L
ss
[mH]
R
s
Ω [ ]
-------------------- =