Bosch Rexroth EFC 3600 Operating Instructions Manual page 163

DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
In case you do not observe the information on cable routing given in this
section, the effect of the mains filter is totally or partly neutralized. This will
cause the noise level of the interference emission to be higher within the
range of 150 kHz to 40 MHz and the limit values at the connection points
of the machine or installation will thereby be exceeded.
Routing and Connecting a Neutral Conductor (N)
If a neutral conductor is used together with a three-phase connection, it must not be in‐
stalled unfiltered in areas B and C, in order to keep interference off the mains.
Motor Blower at Mains Filter
Single-phase or three-phase supply lines of motor blowers, that are usually routed in
parallel with motor power cables or interference-susceptible lines, must be filtered:
● In frequency converter with only infeeding supply units, via the available three phase
filter of the frequency converter
When switching power off, make sure the blower is not switched off.
Loads at Mains Filter of frequency converter
● Only operate allowed loads at the mains filter of the frequency converter!
Shielding Mains Supply Lines in Control Cabinet
If there is a high degree of interference injection to the mains supply line within the con‐
trol cabinet, although you have observed the above instructions (to be found out by
EMC measurement according to standard), proceed as follows:
● Only use shielded lines in area A
● Connect shields to the mounting plate at the beginning and the end of the line by
means of clips
The same procedure may be required for long cables of more than 2 m between the
point of power supply connection of the control cabinet and the filter within the control
cabinet.
Mains Filters for AC Drives
Ideally, mount the external mains filter on the parting line between area A and B. Make
sure the ground connection between filter housing and housing of the drive controllers
has good electrically conductive properties.
If single-phase loads are connected on the load side of the external filter, their current
may be a maximum of 10 % of the three-phase operating current. A highly imbalanced
load of the external filter would deteriorate its interference suppression capacity.
If the mains voltage is higher than 480 V, connect the external filter to the output side of
the transformer and not to the supply side of the transformer.
Bosch Rexroth AG
Electromagnetic Compatibility (EMC)
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