
Commissioning
8200SHB0199
5-9
4.Set slip compensation
Rough setting according to motor data:
(C021):
s
n
Nsyn
n
r
n
Nsyn
100 %
n
Nsyn
f
dr
60
p
s Slipconstant (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).
Inthe fieldfrequencyrange between5 Hz ... 50 Hz (87 Hz)the deviationof the ratedspeedis
$ 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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