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DOK-INDRV*-FCS01******-IT01-EN-P
Rexroth IndraDrive Fc Drive Controllers Frequency Converters FCS01
6
EMC Measures for Design and Installation
6.1
Rules for Design of Installations With Drive Controllers in
Compliance With EMC
Mains filter
Control Cabinet Grounding
Line Routing
Interference Suppression Ele‐
Twisted Wires
Lines of Measuring Systems
Digital Signal Lines
Analog Signal Lines
LSA Control S.L. www.lsa-control.com [email protected] (+34) 960 62 43 01
The following rules are the basics for designing and installing drives in com‐
pliance 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 possi‐
ble 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 sepa‐
rating sheets between power and signal lines. Ground separating sheets sev‐
eral 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
grounded 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 pan‐
els. Separate the incoming and outgoing cables of the radio interference sup‐
pression filter.
Provide the following components in the control cabinet with interference sup‐
ments
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 ca‐
ble) or keep the surface between feeder and return cable as small as possi‐
ble. 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 receiv‐
er) 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
shields.
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
). Braided shields are better than foil
2
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