ABB ACH550-02-645A-4 [40/454] Effective motor cable shields

ABB ACH550-02-645A-4 [40/454] Effective motor cable shields
36 Preparing for installation
ACH550-02 User’s Manual
Effective motor cable shields
The general rule for cable shield effectiveness is: the better and
tighter the shield, the lower the radiated emission level. The
figure below shows an example of an effective construction (for
example Ölflex-Servo-FD 780 CP, Lapp Kabel or MCCMK,
Draka NK Cables).
At the drive end, twist the cable shield wires together into a
bundle not longer than five times its width. Connect the bundle to
the PE busbar if you are using cable without a separate PE
conductor.
Power factor compensation capacitors
Do not connect power factor compensation capacitors or
capacitive surge absorbers to the motor cables (between the
drive and the motor). They are not designed to be used with
drives, and will degrade motor control accuracy. They can cause
permanent damage to the drive or themselves due to the rapid
changes in the drive output voltage.
If there are power factor compensation capacitors in parallel with
the three phase input of the drive, ensure that the capacitors and
the drive are not charged simultaneously to avoid voltage surges
which might damage the drive.
Insulation jacket
Braided metallic shield
Inner insulator
L1
L2
L3

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