Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 42)

42 Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
Chapter 1 Installation and Wiring
• Output power wiring to the motor must employ cable with a braided
shield providing 75% or greater coverage, or the cables must be housed in
metal conduit, or equivalent shielding must be provided. Continuous
shielding must be provided from the drive enclosure to the motor
enclosure. Both ends of the motor cable shield (or conduit) must terminate
with a low-impedance connection to earth.
• At the motor end, the motor cable shield or conduit must terminate in a
shielded connector which must be properly installed in an earthed motor
wiring box attached to the motor. The motor wiring box cover must be
installed and earthed.
• All control (I/O) and signal wiring to the drive must use cable with a
braided shield providing 75% or greater coverage, or the cables must be
housed in metal conduit, or equivalent shielding must be provided. When
shielded cable is used, only the drive end of the cable shield should be
terminated with a low-impedance connection to earth.
• Motor cabling must be separated from control and signal wiring wherever
possible.
• Maximum motor cable length must not exceed the maximum length
indicated in the table on
page 41 for compliance with radio frequency
emission limits for the specific standard and installation environment.
Pollution Degree Ratings According to EN 61800-5-1
IMPORTANT Use of other filters should be verified in the application. Additional filters are
listed in Alternate EMC Filters on page
247 .
Pollution
Degree Description
1 No pollution or only dry, non-conductive pollution occurs. The pollution has no influence.
2 Normally, only non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused
by condensation is to be expected, when the drive is out of operation.
3 Conductive pollution or dry non-conductive pollution occurs, which becomes conductive due to
condensation, which is to be expected.
4 The pollution generates persistent conductivity caused, for example by conductive dust or rain or snow.