Lenze 8200 series - Manual (Page 46)

Commissioning
5-14 UOMu_^MVMO
3.Set the Vmin boost
(C016).
D Load-independentboost of the motor voltage for field frequencies below the
U/f-rated frequency. You can thus optimize the torque performance of the inverter
drive.
D It is absolutely necessary to adapt the asynchronous motor used, since otherwise,
the motor can be destroyed by overtemperatue:
Adjustment
Please note the thermal characteristic of the connected motor under small field
frequencies:
D
Usually, standard asynchronous motors with insulation class B can be operated for a
short time with rated current and frequencies between 0Hz ≤ f
d ≤25Hz.
D Please ask the motor manufacturer for the exact setting values for the motor
current.
A Operate the motor in idle running with a slip frequency of f
d ≈:
- P
mot ≤7.5 kW: f d ≈5 Hz
- P
mot
>7.5 kW: f
d
≈2 Hz
B Increase V
min
until you reach the following motor current:
- Motor in short-term operation at 0Hz ≤f
d ≤ 25Hz:
with self-ventilated motors: I
motor
≤ I
N motor
with forced-ventilated motors: I
motor
≤ I
N motor
- Motor in permanent operation at 0Hz ≤f
d
≤ 25Hz:
with self-ventilated motors I
motor
≤ 0.8 ¡I
N motor
with forced-ventilated motors: I
motor
≤ I
N motor
4.Set slip compensation
(C021)
Rough setting by means of the motor data: Set s p co pe sat o
(C021).
л =
е
клуе − е к
е
клуе
⋅ NMMB
е
клуе =
С
Зк
⋅ SM
é
s Slip constant (C021)
n
rsyn
synchronous motor speed [min -1 ]
n
r
rated speed to motor nameplate [min -1 ]
f
dr
rated frequency to motor nameplate [Hz]
p Number of pole pairs
Precise setting:
Change C021 under constant load until the speed is near the synchronous speed.
If C021 is set to too high values, the drive may become instable (overcompensation).
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