Rexroth IndraDrive Arranging the Components in the Control Cabinet 7-21
DOK-INDRV*-SYSTEM*****-PR02-EN-P
• When using DC bus resistor unit and DC bus capacitor unit in a drive
system, arrange the DC bus capacitor unit between supply unit and
DC bus resistor unit.
EMC Measures for Design and Installation
Rules for Design of Installations with Drive Controllers in
Compliance with EMC
The following rules are the basics for designing and installing drives in
compliance with EMC.
Correctly use a mains filter recommended by Rexroth for radio
interference suppression in the supply feeder of the AC drive system.
All metal parts of the cabinet have to be connected with one another over
the largest possible surface area to establish a good electrical connection.
This, too, applies to the mounting of the EMC filter. If required, use
serrated washers which cut through the paint surface. The cabinet door
should be connected to the cabinet using the shortest possible grounding
straps.
Signal, mains and motor lines and power cables have to be routed
separately from another (this eliminates mutual interference!). Minimum
clearance: 10 cm. Provide separating sheets between power and signal
lines. Separating sheets have to be grounded at several points.
Generally, interference injection are reduced by routing cables close to
grounded sheet steel panels. For this reason, cables and wires should not
be routed freely in the cabinet, but close to the cabinet housing or
mounting panels. The incoming and outgoing cables of the radio
interference suppression filter have to be separated.
Contactors, relays, solenoid valves, electromechanical operating hour
counters etc. in the control cabinet must be provided with interference
suppression combinations. These combinations must be connected
directly at each coil.
Non-shielded cables belonging to the same circuit (feeder and return
cable) have to be twisted or the surface between feeder and return cable
has to be kept as small as possible. Ground cables that are not used at
both ends.
Lines of measuring systems have to be shielded. The shield has to be
connected to ground at both ends and over the largest possible surface
area. The shield may not be interrupted, e.g. using intermediate terminals.
The shields of digital signal lines have to be grounded at both ends
(transmitter and receiver) over the largest possible surface area and with
low impedance. Bad ground connection between transmitter and receiver
requires additional routing of a bonding conductor (min. 10 mm²). Braided
shields are to be preferred to foil shields.
The shields of analog signal lines generally have to be grounded at one
end (transmitter and receiver) over the largest possible surface area and
with low impedance, in order to avoid low-frequency interference current
(in the mains frequency range) on the shield.
Keep connection lines of mains chokes as short as possible and twist
them.
Preferably use the motor power cables with shield provided by Rexroth. If
you use other motor power cables, they have to be run in shielded form.
Keep length of motor power cable as short as possible.
Ground shield of motor cable at both ends over the largest possible
surface area to establish a good electrical connection.
Run motor lines in shielded form inside the control cabinet.
Mains Filter
Control Cabinet Grounding
Line Routing
Interference Suppression
Elements
Twisted Wires
Lines of Measuring Systems
Digital Signal Lines
Analog Signal Lines
Connection of Mains Choke to
Drive Controller
Installation of Motor Power
Cable
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