Rockwell Automation 161 SERIES A - Manual (Page 38)

Bulletin 161
32
General instructions for an EMC compliance installation
Enclosure
•
Typical IEC metal enclosures are adequate.
•
The ground connection of the enclosure must be solidly connected to the PE terminal of the drive. Good
conductivity must be assured – grounding must provide a low impedance path for high frequency signals.
•
All wiring, except input power leads, must be shielded cable.
•
Input power, output power and control wiring inside the enclosure must be physically separated.
•
Input power, output power and control wiring outside the enclosure must use separate shielded cables
or separate metal conduit.
Cable Clamps
•
Use suitable EMC cable clamps.
•
The connection area must be 360 degrees around the shielded cables.
•
When using conduit, the contact point of metal must be free of paint or non-conductive surfaces
and solidly connected with good conductivity to the enclosure.
Motor Cable
•
The cable between the drive and motor must be 4-wire shielded cable (three phases and ground).
•
Do not exceed the maximum motor cable length for the specific line filter module used.
•
Inside the enclosure, shielded motor cable should be used as close to the drive’s output terminals
as possible.
•
Where the shielded motor cable exits the enclosure, an EMC cable clamp, or metal conduit must be used
to solidly connect the cable shield to the enclosure.
•
The shield on the motor side must be solidly connected to the motor housing with an EMC cable clamp,
or conduit, providing good conductivity from the cable shield to the motor housing.
Control Wiring
•
Control wiring must use shielded cable or grounded metal conduit.
•
The shield must be connected to PE at both ends of the cable.
•
Inside the enclosure, shielded control wiring should be connected as close to the drive’s control terminals
as possible.