.-.
6.3 Motor filter
Advantages of using a motor filter:
. The motor filter
reduces
capacitive currents
caused
by
parasitic
cable capacitances.
l The slope of the motor voltage
(dv/dt)
is limited to 500
V/ps.
Motorfilters are always required for:
l unscreened cables
langer
than 1
OOm.
l screened cables longer than 50m.
o
when using motors
which
do not have suitable insulation for
controller Operation.
(Observe
data of the motor manufacturer.)
Please note:
Install
the motor filter as
close
as possible to the controller
-
Maximum cable length 5 m
Connect
+!JG
and
-!JG
of the motor filter only to the controller
terminals of the same designation.
Select the control mode
“V/f-characteristic
control”
(CO06 = -0-). The control “magnetizing-current control” is not
permissible.
The
chopper
frequency must be 4 kHz.
The max. permissible output frequency is 300 Hz.
The controller is loaded in addition to the motor
current
with
approx. 12% of the rated filter
current.
The voltage drop
across
the motor filter at rated
current
and
rated frequency
(fd
= 50 Hz) is 2 to 3% of the controller output
voltage.
For motor cable lengths
>
100 m (screened) and
z-
200 m
(un-
screened) a sine filter should be used.
With unscreened motor cables it should be tested whether the
System
camplies
with the interference
levels
required for the
CE-EMC conformity.
hze
45
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