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Electromagnetic Compatibility (EMC)
Routing and Connecting a Neutral Conductor (N)
If a neutral conductor is used together with a three-phase connection, it must
not be installed 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 rout-
ed 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 control 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 high-
ly imbalanced load of the external filter would deteriorate its interference sup-
pression capacity.
If the mains voltage is higher than 480 V, connect the external filter to the out-
put side of the transformer instead of the supply side of the transformer.
Grounding
In the case of bad ground connections in the installation, the distance between
the lines to the grounding points E1, E2 in area A and the other grounding points
of the frequency converter should be at least d4 = 400 mm, in order to minimize
interference injection from ground and ground cables to the power input lines.
See also
"Division into Areas (zones)" on page
Bosch Rexroth AG R912005854_Edition 09
Rexroth Frequency Converter EFC x610
94.
Series
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