Rexroth IndraDrive Arranging the Components in the Control Cabinet 7-25
DOK-INDRV*-SYSTEM*****-PR02-EN-P
If there is a high degree of interference injection to the power input line
within the control cabinet, in spite of you having observed the above
instructions (to be found out by standard EMC measurement), the lines in
area A have to be routed in shielded form. In this case the shields have to
be connected 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.
The mains filter is mounted 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 filter, their current may
only be a maximum of 10% of the three-phase operating current. A highly
imbalanced load of the filter would deteriorate its interference suppression
capacity.
If the mains voltage is more than 480 V, the filter has to be connected on
the output side of the transformer and not on its supply side.
In the case of bad ground connections in the installation, the distance
between the grounding points E1, E2 in area A and the other grounding
points of the drive system should be at least d4 = 400mm, in order to
minimize interference injection from ground and ground cables to the
power input lines.
See also Fig. 7-21: Separation of interference-free area and
interference-susceptible area in control cabinet
The equipment grounding conductor of the power cable of the machine,
installation or control cabinet of the has to be firmly connected at point
PE and have a cross section of at least 10 mm
2
or to be complemented
by a second equipment grounding conductor via separate terminal
connectors (according to EN50178/ 1997, section 5.3.2.1). If the cross
section of the outer conductor is bigger, the cross section of the
equipment grounding conductor has to be adjusted accordingly.
Design and Installation in Interference-Susceptible Area
of Control Cabinet (Area B)
Modules, components and lines in area B have to be placed at a distance
of at least d1 = 200 mm from modules and lines in area A or shielded by
distance plates mounted vertically on the mounting plate.
Power supply units for auxiliary or control voltage connections in the drive
system mustn't be directly connected to the mains, but have to be
connected to the mains via a mains filter, as indicated in Fig. 7-21:
Separation of interference-free area and interference-susceptible
area in control cabinet.
Keep line length between drive controller and filter as short as possible.
Avoid unnecessary lengths.
Only in exceptional cases should a connection of power supply unit and
fusing for the control voltage connection be made at phase and neutral
conductor. In this case these components have to be mounted and
installed in area A, far away from the areas B and C of the drive system.
For details see chapter "Design and Installation in Interference-Free Area
of Control Cabinet (Area A)".
The connection between control voltage connection of the drive system
and power supply unit used has to be run through area B over the
shortest distance.
Shielding Mains Supply Lines in
Control Cabinet
Mains Filters for AC Drives
Grounding
Point of Connection for
Equipment Grounding
Conductor of Machine,
Installation, Control Cabinet
Arranging Components and
Lines
Control Voltage or Auxiliary
Voltage Connection
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