Lenze 8200 Frequency inverters - Manual (Page 114)

Commissioning
8200SHB0199 5-9
4.Set slip compensation
(C021):
Rough setting according to motor data: 4.Set slip compensation
(C021):
s 
n
Nsyn
Å n
r
n
Nsyn
ô 100 %
n
Nsyn

f
dr
ô 60
p
s Slip constant (C021)
n
Nsyn
Synchronous motor speed [min -1 ]
n
r
Rated speed to motor nameplate [min -1 ]
f
dr
Rated frequency to motor nameplate [Hz]
p No. of pole pairs (1, 2, 3, ...)
Precise setting:
- Correct C021 until no load-dependent speed drop occurs in the required speed range between
idle running and max. motor load.
- If the values under C021 are too high, the drive may become instable (overcompensation).
- In the field frequency range between 5 Hz ... 50 Hz (87 Hz) the deviation of the rated speed is
$ 1 %(guide value). In field-weakening operation, the fault increases.
Important - The change from V/f-characteristic control to motor-current control should only be carried out
when the controller is inhibited.
- The idle current of the motor (magnetising current) must not exceed the rated current of the
controller.
- With very small friction values, it is possible that a phase offset of up to 180 • occurs at the motor
shaft when enabling the controller.
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