Bosch Rexroth EFC 3600 Operating Instructions Manual page 159

DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
Twisted Wires
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
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 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.
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 in‐
terference 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.
Installation of Motor Power Cable
● Use shield motor power cable or run motor power cables in a shielded duct;
● Use the shortest possible motor power cable;
● Ground shield of motor power cable at both ends over the largest possible surface
area to establish a good electrical connection;
● It is recommended to run motor lines in shielded form inside the control cabinet;
● Do not use any steel-shielded lines;
● The shield of the motor power cable must not be interrupted by mounted compo‐
nents, such as output chokes, sine filter or motor filters.
11.3.2 EMC-optimal installation in facility and control cabinet
General Information
For EMC-optimal installation, a special separation of the interference-free area (mains
connection) and the interference-susceptible area (drive components) is recommen‐
ded, as shown in the figures below.
Bosch Rexroth AG
Electromagnetic Compatibility (EMC)
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