6.2.5
EMC measures for design and installation
Rules for designing installations with drive controllers in compliance with EMC
The following rules are the basics for designing and installing drives in com‐
pliance with EMC.
Mains filter
Properly use a mains filter recommended by Rexroth for radio interference
suppression in the supply feeder of the drive system.
Control cabinet grounding
Connect all metal parts of the cabinet with one another over the largest possi‐
ble surface area to establish a good electrical connection. This also applies to
mounting 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.
Line routing
Avoid coupling routes between lines with high potential of noise and noise-
free lines; therefore, route signal, mains and motor lines, and power cables
separately from another. Minimum distance: 10 cm. Provide separating
sheets between power and signal lines. Ground separating sheets several
times.
Lines with a 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
plates. Separate the incoming and outgoing cables for the radio interference
suppression filter.
Interference suppression elements
Equip 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.
Twisted wires
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 for measuring systems
Lines for measuring systems have to be shielded. Connect the shield to
ground at both ends and over the largest possible surface area. The shield
should not be interrupted, e.g., using intermediate terminals.
Digital signal lines
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, also route a
bonding conductor (min. 10 mm
2
). Braided shields are better than foil shields.
Analog signal lines
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.
Connecting the mains choke
Keep connection lines of the mains choke at the drive controller as short as
possible and twist them.
DOK-INDRV*-HCS01******-PR05-EN-P
Bosch Rexroth AG
171/341
Rexroth IndraDrive CsDrive Systems with HCS01
Mounting and installation
