Commissioning
5-14
UOMu_^MVMO
3.Set the Vmin boost
(C016).
D
Load-independent
boost 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).
ë
=
å
êëóå
−
å
ê
å
êëóå
⋅
NMMB
å
êëóå
=
Ñ
Çê
⋅
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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