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2.8.1 Ferrite Ring Installation
All PWM-type frequency inverters generate high frequencies as a result
of fast switching of the IGBT output transistors. As these high frequencies
travel along the motor wires, they can easily be coupled to other wires in
proximity to the motor leads. This is especially true for low voltage encoders.
The included ferrite rings can be used to limit the high-frequency noise
which is transmitted on the motor wires by inserting a small amount of
inductance on each motor lead. These rings can also be useful when
shielded cables are used since they will limit the available high frequencies
even before the shield on the cable. Refer to the following table for quantity
and part numbers.
Housing Size Quantity All Phases
(Part Number)
‘E’ 1
(00.90.390-K000)
‘G’ 1
(00.90.390-K000)
‘H’ 1
(00.90.390-K000)
‘R’ 1
(00.90.395-K001)
‘U’ 2
(00.90.395-K001)
‘W’ 2
(00.90.395-K001)
1.1.
1.2.
Part Number Overall Dimensions in mm (inches)
00.90.390-K000 56 x 32 x 18 (2.2 x 1.3 x 0.7)
00.90.395-K001 63 x 38 x 25 (2.5 x 1.5 x 1.0)
2.8.1 Ferrite Ring
Installation