-.
-
-
Vif-rated frequency
With the V/f-rated frequency, the slope of the characteristic is set.
The value to be entered
under
CO1 5 results from the motor ratings:
V
/
f -- rated frequency =
400 v
VNmotor
. rated motor frequency
The values for the most common motor
types
tan
be obtained from
the following table.
Motor data
V/f-rated
rated voltage rated frequency frequency (C015)
380V
50Hz 52.6Hz
4oov
50Hz
50.OHz
I
415v
50Hz 48.2Hz
1
t
415v 60Hz
57.8Hz
440v
60Hz 54.5Hz
460V 60Hz
52.2Hz
50Hz 41.7Hz
k
4aov
4aov
60Hz
50.OHz
1
Voltage boost
Vmin
In the low
Speed
range, the obtained torque is determined largely
by the set voltage boost. If you set
Vmin
(CO1
6),
make sure that the
motor
cannot
be destroyed by overheat.
Experience
teils
that self-ventilated Standard asynchronous
machines of insulation
class
B
tan
be operated in a frequency
range up to 25Hz only for a short time with rated current. Therefore
proceed as follows:
l
The
motor should be operated in idle running.
l Provide a
setpoint
of 4 to 5 Hz.
l The voltage boost should be set such that
-.
the motor current (C054) does not exceed the rated value
for
short-time
Operation in the low frequency range.
-.
the motor current (C054) does not exceed 80 % of its rated
value for permanent Operation in the
low
frequency range.
For
exact
data of the permissible motor current please refer
to
the
motor manufacturer.
Forced-ventilated machines
tan
be permanently operated with
ratecl
current even in the low frequency range.
Name Parameter
(Factory
setting
is printed in
hold)
Acceptance
Vif -o-
linear characteristic V
-
fd
SH + PRG
characteristic
-l-
Square
characteristic V
-
fd*
Vif-rated
50
Hz
7.5 Hz (0.1 Hz)
100 Hz ON-LINE
freauencv
100 Hz
II
Hz)
960 Hz)
pf3
-1
~~
Voltage boost
0% 0 %
(0.1
%)
40%lON-LINE
-
lenze
71
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