Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 194)

184 Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013
Appendix D ArcShield Unit Information
Additional Notes The walls of the plenum exit area must be capable of withstanding the pressure
generated.
Any painted surfaces which face direct contact with the arc products may ignite.
Flame suppression is recommended.
The exit point can also be outside the building. Ensure exit area can not be
blocked by ice, snow, vermin nests.
Access barriers are recommended as a means of restricting access by personnel
while the equipment is energized. Chain link fencing is a suitable barrier material.
Equipment that consists of more than 4 vertical sections bolted together may
require additional plenum exits. Rockwell Automation will provide guidance on
requirements for additional plenum exits when required.
Chimney Information Where adequate clean height (space) is available, chimney can be provided for
each unit in place of the plenum system. It is to be field mounted on top of the
unit structure. The purpose of the chimney is to direct the hazardous flames and
gases away from the top of the resistant enclosure for the chimney is secured to
the top of each unit structure. Refer to
Appendix F for chimney installation
instructions.
Each ArcSheild line-up includes a chimney exhaust section that extends vertically
directly above the enclosure.
Chimney Exhaust
Considerations 1. From the outlet of the chimney, there needs to be a minimum clear
distance of 1.7m from the top of the chimney to the ceiling, and 1m
(39 in.) on each side.
2. No obstructions (eg. Piping) can be in path of the exhaust within this 1.7m
(67 in.) height requirement.
Plan the location where the chimney will exhaust. Ensure that:
• There is no access to personnel while equipment is energized.
• Area is free of flammable material or vapors.
• Ensure that adequate space is provided around the chimney exhaust as
outlined in
Figure 83 .