Emc Measures For Design And Installation; Rules For Design Of Installations With Drive Controllers In Compliance With Emc - Bosch Rexroth IndraDrive HMS02 Instruction Manual

DOK-INDRV*-HMS02*UL***-IB03-EN-P
Rexroth IndraDrive Drive Controllers Power Sections HMS02
6

EMC Measures for Design and Installation

6.1 Rules for Design of Installations With Drive Controllers in Com‐
pliance With EMC
Mains Filter
Control Cabinet Grounding
Line Routing
Interference Suppression Elements
Twisted Wires
Lines of Measuring Systems
Digital Signal Lines
Analog Signal Lines
The following rules are the basics for designing and installing drives in compli‐
ance with EMC.
Correctly use a mains filter recommended by Rexroth for radio interference
suppression in the supply feeder of the drive system.
Connect all metal parts of the cabinet with one another over the largest possible
surface area to establish a good electrical connection. This, too, applies to the
mounting of the mains filter. If required, use serrated washers which cut through
the paint surface. Connect the cabinet door to the control cabinet using the
shortest possible grounding straps.
Avoid coupling routes between lines with high potential of noise and noise-free
lines; therefore, signal, mains and motor lines and power cables have to be
routed separately from another. Minimum distance: 10 cm. Provide separating
sheets between power and signal lines. Ground separating sheets several
times.
The lines with high potential of noise include:
● Lines at the mains connection (incl. synchronization connection)
● Lines at the motor connection
Lines at the DC bus connection
Generally, interference injections are reduced by routing cables close to groun‐
ded sheet steel plates. For this reason, cables and wires should not be routed
freely in the cabinet, but close to the cabinet housing or mounting panels. Sep‐
arate the incoming and outgoing cables of the radio interference suppression
filter.
Provide the following components in the control cabinet with interference sup‐
pression combinations:
● Contactors
● Relays
● Solenoid valves
● Electromechanical operating hours counters
Connect these combinations directly at each coil.
Twist unshielded wires belonging to the same circuit (feeder and return cable)
or keep the surface between feeder and return cable as small as possible. Wires
that are not used have to be grounded at both ends.
Lines of measuring systems must be shielded. Connect the shield to ground at
both ends and over the largest possible surface area. The shield may not be
interrupted, e.g. using intermediate terminals.
Ground the shields of digital signal lines at both ends (transmitter and receiver)
over the largest possible surface area and with low impedance. In the case of
bad ground connection between transmitter and receiver, additionally route a
bonding conductor (min. 10 mm
Ground the shields of analog signal lines at one end (transmitter or receiver)
over the largest possible surface area and with low impedance. This avoids low-
frequency interference current (in the mains frequency range) on the shield.
Bosch Rexroth AG
EMC Measures for Design and Installation
2 ). Braided shields are better than foil shields.
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