Rockwell Automation 20Y PowerFlex Active Front End - Manual (Page 61)

Rockwell Automation Publication 20Y-UM001E-EN-P - July 2014 61
AFE in IP21 Rittal Enclosure—Installation/Wiring Chapter 2
Fuses and Circuit Breakers The IP21 Rittal enclosure for the AFE includes a motor-controlled circuit
breaker (MCCB) and DC bus output fusing. The MCCB is used for precharge
operation. For details on MCCB and precharge operation, see
page 78 . For fuse
and circuit breaker information, see Appendix A . Local/national electrical codes
can determine additional requirements for the installations.
Power Wiring Because most start-up difficulties are the result of incorrect wiring, take every
precaution to verify the wiring is correct. Read and understand all items in this
section before beginning installation.
Power Cable Types Acceptable for 400…690 Volt Installations
A variety of cable types are acceptable for PowerFlex Active Front End
installations. For many installations, unshielded cable is adequate, provided it can
be separated from sensitive circuits. As an approximate guide, use a spacing of 0.3
meters (1 ft) for every 10 meters (32.8 ft) of length. In all cases, avoid long
parallel runs. Do not use cable with an insulation thickness less than or equal to
15 mils (0.4mm/0.015 in.). Use only copper wire. Wire gauge requirements and
recommendations are based on 75 °C. Do not reduce wire gauge when using
higher temperature wire.
Unshielded Cable
THHN, THWN or similar wire is acceptable for PowerFlex Active Front End
installation in dry environments provided adequate free air space and/or conduit
fill rates limits are provided. Do not use THHN or similarly coated wire in wet
areas.
Any wire chosen must have a minimum insulation thickness of 15 mils and
cannot have large variations in insulation concentricity.
ATTENTION: The following information is merely a guide for proper installation.
Rockwell Automation cannot assume responsibility for the compliance or
noncompliance to any code, national, local, or otherwise for the proper
installation of this unit or associated equipment. A risk of personal injury and/or
equipment damage exists if codes are ignored during installation.
ATTENTION: National Codes and standards (NEC, VDE, CSA, BSI, and so forth) and
local codes outline provisions for safely installing electrical equipment.
Installation must comply with specifications regarding wire types, conductor
sizes, branch circuit protection, and disconnect devices. Failure to do so may
result in personal injury and/or equipment damage.