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Bosch Rexroth EFC 3600 Operating Instructions Manual page 167

Frequency converter
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DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
Shielding
Connect the cable shield immediately at the devices in the shortest and most direct
possible way and over the largest possible surface area.
Connect the shield of analog signal lines at one end over a large surface area, normally
in the control cabinet at the analog device. Make sure the connection to ground/hous‐
ing is short and over a large surface area.
Connect the shield of digital signal lines at both ends over a large surface area and in
short form. In the case of potential differences between beginning and end of the line,
run an additional bonding conductor in parallel. This prevents compensating current
from flowing via the shield. The guide value for the cross section is 10 mm
You absolutely have to equip separate connections with connectors with grounded met‐
al housing.
In the case of non-shielded lines belongs to the same circuit, twist feeder and return
cable.
11.3.9
General measures of radio interference suppression for relays,
contactors, switches, chokes and inductive loads
If, in conjunction with electronic devices and components, inductive loads, such as
chokes, contactors, relays are switched by contacts or semiconductors, appropriate in‐
terference suppression has to be provided for them:
● By arranging free-wheeling diodes in the case of d.c. operation
● In the case of a.c. operation, by arranging usual RC interference suppression ele‐
ments depending on the contactor type, immediately at the inductance
Only the interference suppression element arranged immediately at the inductance
does serve this purpose. Otherwise, the emitted noise level is too high which can affect
the function of the electronic system and of the drive.
If possible, mechanical switches and contacts should only be realized as snap con‐
tacts. Contact pressure and contact material must be suited for the corresponding
switching currents.
Slow-action contacts should be replaced by snap switches or by solid-state switches,
because slow-action contacts strongly bounce and are in an undefined switching status
for a long time which emits electromagnetic waves in the case of inductive loads.
These waves are an especially critical aspect in the case of manometric or temperature
switches.
Bosch Rexroth AG
Electromagnetic Compatibility (EMC)
2
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165/235
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