Motor Cable Shield; Cable Routing - ABB ACS 601 Hardware Manual

Appendix C – IEC Installation

Motor Cable Shield

Cable Routing

C-2 ACx=ACS/ACC/ACP
To effectively supress radiated and conducted radio-frequency
emissions, the shield conductivity must be at least 1/10 of the phase
conductor conductivity. One way of evaluating the effectiveness of the
shield is the shield inductance, which must be low and only slightly
dependent on the frequency. These requirements are easily met with a
copper or aluminium shield. The minimum requirement of the motor
cable shield of the ACx 600 is shown below. It consists of a concentric
layer of copper wires with an open helix of copper tape. The better and
tighter the shield is, the lower is the emission level and the bearing
currents.
Copper wire screen
Insulation jacket
The motor cable should be installed 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, power cable and
control cables be installed on separate trays (minimum distance 500
mm (20")). Long parallel runs of motor cable with other cables should
be avoided in order to decrease electromagnetic interference caused
by the rapid changes in the frequency converter output voltage.
Where control cables must cross power cables make sure they are
arranged at an angle as near to 90 degrees as possible. Extra cables
should not be run through the ACx 600.
The cable trays have good electrical bonding to each other and to the
grounding electrodes. Aluminium tray systems can be used to improve
local equalizing of potential.
Below is a diagram of cable routing.
Power cable
90 °
Control cables
Helix of copper tape
ACS 600
ACT PAR FUNC DRIVE
ENTER
LOC RESET REF
REM
min 300 mm (12")
min 500 mm (20")
Inner insulation
Cable core
Motor cable
ACS/ACC/ACP 601 Drives