6.2.5 Design and Installation in Area B - Interference-Susceptible Area of
Control Cabinet
Arranging Components and Lines
Modules, components and lines in area B should be placed at a distance of
at least d1 = 200 mm from modules and lines in area A.
Alternative: Shield modules, components and lines in area B by distance
plates mounted vertically on the mounting plate from modules and lines in
area A or use shielded lines.
Only connect power supply units for auxiliary or control voltage connections
in the drive system to the mains via a mains filter. See 6.2.2 Division Into
Areas (Zones), page 58.
Install the shortest possible lines between drive controller and filter.
Control Voltage or Auxiliary Volt‐
age Connection
Only in exceptional cases should you connect power supply unit and fusing
for the control voltage connection to phase and neutral conductor. In this
case, mount and install these components in area A far away from the areas
B and C of the drive system. For details see section 6.2.4 Design and Instal‐
lation in Area A - Interference-Free Area of Control Cabinet, page 63.
Run the connection between control voltage connection of the drive system
and power supply unit used through area B over the shortest distance.
Line Routing
Run the lines along grounded metal surfaces, in order to minimize radiation
of interference fields to area A (transmitting antenna effect).
6.2.6 Design and Installation in Area C - Strongly Interference-Susceptible
Area of Control Cabinet
Area C mainly concerns the motor power cables, especially at the connection
point at the drive controller.
Influence of the Motor Power Ca‐
ble
The longer the motor power cable, the greater its leakage capacitance. To
comply with a certain EMC limit value, the allowed leakage capacitance of
the mains filter is limited. For the calculation of the leakage capacitance, see
the documentation on the drive system of the drive controller used.
● Run the shortest possible motor power cables.
● Only use shielded motor power cables by Rexroth.
6.3 Ground Connections
Housing and Mounting Plate
By means of appropriate ground connections, it is possible to avoid the emis‐
sion of interference, because interference is discharged to ground on the
shortest possible way.
Ground connections of the metal housings of EMC-critical components (such
as filters, devices of the drive system, connection points of the cable shields,
devices with microprocessor and switching power supply units) have to be
well contacted over a large surface area. This also applies to all screw con‐
nections between mounting plate and control cabinet wall and to the mount‐
ing of a ground bus to the mounting plate.
The best solution is to use a zinc-coated mounting plate. Compared to a lac‐
quered plate, the connections in this case have a good long-time stability.
Connection Elements
For lacquered mounting plates, always use screw connections with tooth lock
washers and zinc-coated, tinned screws as connection elements. At the con‐
nection points, remove the lacquer so that there is safe electrical contact over
a large surface area. You achieve contact over a large surface area by
means of bare connection surfaces or several connection screws. For screw
DOK-INDRV*-KSM02*UL***-IN01-EN-P
Rexroth IndraDrive Mi Distributed Servo Drive KSM02
Bosch Rexroth AG 65/81
EMC Measures for Design and Installation
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