Influence of the Motor Power Cable
The longer the motor cable, the greater its leakage capacitors. To comply with a
certain EMC limit value, the allowed leakage capacitance of he mains filter is
limited.
● Run the shortest possible motor power cables.
Routing the Motor Power Cables and Motor Encoder Cables
Route the motor power cables and motor encoder cables along grounded metal
surfaces, both inside the control cabinet and outside of it, in order to minimize
radiation of interference fields. If possible, route the motor power cables and
motor encoder cables in metal-grounded cable ducts.
Route the motor power cables and motor encoder cables
● with a distance of at least d5=100 mm to inference-free lines, as well as to
signal cables and signal lines
(alternatively separated by a grounded distance plate)
● in separate cable ducts, if possible
Routing the Motor Power Cables and Mains Connection Lines
For frequency converters (drive controllers with individual mains connection),
route motor power cables and (unfiltered) mains connection lines in parallel for
a maximum distance of 300 mm. After that distance, route motor power cables
and power supply cables in opposite directions and preferably in separate cable
ducts.
Ideally, the outlet of the motor power cables at the control cabinet should be
provided in a distance of at least d3=200 mm from the (filtered) power supply
cable.
11.3.7 Ground Connections
Housing and Mounting Plate
By means of appropriate ground connections, it is possible to avoid the emis-
sion of interference, because interference is discharged to ground on the short-
est possible way.
Ground connections of the metal housings of EMC-critical components (such as
filters, devices of the frequency converter, connection points of the cable
shields, devices with microprocessor and switching power supply units) have to
be well contacted over a large surface area. This also applies to all screw con-
nections between mounting plate and control cabinet wall and to the mounting
of a ground bus to the mounting plate. The best solution is to use a zinc-coated
mounting plate. Compared to a lacquered plate, the connections in this area
have a good long-time stability.
Connection Elements
For lacquered mounting plates, always use screw connections with tooth lock
washers and zinc-coated, tinned screws as connection elements. At the connec-
EFC 3600
Bosch Rexroth AG
Electromagnetic Compatibility (EMC)
DOK-RCON03-EFC-3600***-IT03-EN-P
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