Parker AC890 Product Manual page 98

The connection between the drive module and the motor must be installed away from all other cables or wires.
Ideally the filter(s) and choke will be mounted onto the same metallic back panel as the drive. The RF
connection between the drive, filter, choke and panel should be enhanced as follows:-
 Remove any paint/insulation between the mounting points of the EMC filter(s), choke, drive module
 Liberally apply petroleum jelly over the mounting points and securing threads to prevent corrosion.
 If the proceeding is not possible, then the RF earth bond between the filter and drive module is
Note Metal surfaces such as eloxized or yellow chromed (e.g. cable mounting or 35mm DIN rails, screws and
bolts) have a high RF impedance which can be very detrimental to EMC performance.
A low RF impedance path must be provided between the motor frame and back panel on which the drive,
choke and EMC filters are mounted. This low impedance RF path should follow the path of the motor cables
in order to minimise the loop area. Failure to do so will result in increased conducted emissions.
This will normally be achieved by:-
1. Bonding the armour of the motor supply cables at one end to the motor frame and at the other to the cubicle
back panel. Ideally 360
2. Ensuring that conduit containing the motor supply cables is bonded together using braid. The conduit shall
also be bonded to the motor frame and the cubicle back panel.
890SD (Standalone) Drive: Frame G, H & J
and panel.
Alternately conducting paint could be used on mounting panels.
usefully improved by making an additional RF earth connection using wire braid of at least 10mm
cross sectional area (due to skin effect).
o bonding is required, which can be achieved with cable glands.
Associated Equipment
5-12
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