Connecting The Signal And Control Cables; Routing The Cables - ABB DCS800 Hardware Manual

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Connecting the signal and control cables

The cables for digital signals, which are longer than 3 m and all cables for analogue
signals, must be screened. Each screen must be connected at both ends by metal
clamps or comparable means directly on clean metal surfaces, if both earthing
points belong to the same earth line. Otherwise a capacitor must be connected to
earth on one end. In the converter cubicle this kind of connection must be made
directly on the sheet metal as close as possible to the terminals and if the cable
comes from outside also on the PE bar. At the other end of the cable the screen
must be well connected with the housing of the signal emitter or receiver.

Routing the cables

Route the motor cable away from other cable routes. Motor cables of several drives
can be run in parallel installed next to each other. It is recommended that the motor
cable, input power cable and control cables be installed on separate trays. Avoid
long parallel runs of motor cables with other cables in order to decrease
electromagnetic interference caused by the rapid changes in the drive output
voltage.
Where control cables must cross power cables make sure they are arranged at an
angle as near to 90 degrees as possible. Do not run extra cables through the drive.
The cable trays must have good electrical bonding to each other and to the
grounding electrodes. Aluminium tray systems can be used to improve local
equalizing of potential.
A diagram of the cable routing is shown below.
Drive
Input power cable
90 °
min 200 mm (8 in.)
Control cables
Electrical installation
Connection of a cable
screen with the aid of
metal clamp to the me-
tal surface of the PCB
carrier at a DCS con-
verter
Size D6, D7
Screen connection
Motor cable
min 300 mm (12 in.)
Power cable
Motor cable
min 500 mm (20 in.)
3ADW000194R0611 DCS800 Hardware Manual f us
24 V 115/230 V
Control cable duct
Not allowed unless the 24 V
cable is insulated for 230 V or
insulated with an insulation
sleeving for 115/230 V.
24 V 115/230 V
Lead 24 V and 115/230 V
control cables in separate
ducts inside the cabinet.