Control Cabinet Grounding
Connect all metal parts of the cabinet with one another over the largest possi-
ble surface area to establish a good electrical connection. This, too applies to
the mounting of the external mains filter. If required, use serrated washers
which cut through the paint surface. Connect the cabinet door to the control
cabinet using the shortest possible grounding straps.
Line Routing
Avoid coupling routes between lines with high potential of noise and noise-free
lines; therefore, signal, mains and motor lines and power cables have to be rout-
ed separately from another. Minimum distance: 10 cm. Provide separating
sheets between power and signal lines. Ground separating sheets several times.
The lines with high potential of noise include:
● Lines at the mains connection (incl. synchronization connection)
● Lines at the motor connection
● Lines at the DC bus connection
Generally, interference injections are reduced by routing cables close to groun-
ded sheet steel plates. For this reason, cables and wires should not be routed
freely in the cabinet, but close to the cabinet housing or mounting panels. Sepa-
rate the incoming and outgoing cables of the radio interference suppression fil-
ter.
Interference Suppression Elements
Provide the following components in the control cabinet with interference sup-
pression combinations:
● Contactors
● Relays
● Solenoid valves
● Electromechanical operating hours counters
Connect these combinations directly at each coil.
Twisted Wires
Twist unshielded wires belonging to the same circuit (feeder and return cable)
or keep the surface between feeder and return cable as small as possible. Wires
that are not used have to be grounded at both ends.
Lines of Measuring Systems
Lines of measuring systems must be shielded. Connect the shield to ground at
both ends and over the largest possible surface area. The shield may not be in-
terrupted, e.g. using intermediate terminals.
Bosch Rexroth AG
Electromagnetic Compatibility (EMC)
EFC 3600
150/259
DOK-RCON03-EFC-3600***-IT03-EN-P
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