9.4.3 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 com‐
pliance with EMC:
Mains Filter
Correctly 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, too applies to
the mounting of the external 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 routs 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 separat‐
ing sheets between power and signal lines. Ground separating sheets sever‐
al 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.
Interference Suppression Ele‐
ments
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.
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 of Measuring Systems
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.
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. This
avoids low frequency interference current (in the mains frequency range) on
the shield.
Analog Signal Lines
Ground the shields of analog signal lines at one end (transmitter or receiver)
over the largest possible surface area and with lower impedance. This avoids
low frequency interference current (in the mains frequency range) on the
shield.
Connection of Mains Choke
Keep connection lines of the mains choke at the drive controller as short as
possible and twist them.
DOK-RCON02-FV*********-IB08-EN-P Bosch Rexroth AG 181/259
Rexroth Frequency Converter Fv
Technical Data
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