Rockwell Automation 6000 PowerFlex Medium Voltage Variable Frequency Drive Installation Instructions - Manual (Page 38)

38 Rockwell Automation Publication 6000-IN006A-EN-P - April 2014
Chapter 2 Drive Mechanical Installation
External Ducting The PowerFlex 6000 design can accommodate ducting exhaust air outside of the
control room.
The following requirements are mandatory design requirements for systems that
will externally duct the exhaust air and draw cleansed outside air:
• External ducting including an external filtering system must not add more
than 50 Pa (0.2 in. of water) pressure drop to the PowerFlex 6000 drive air
flow system. Ensure a minimum top clearance of 1000 mm (39.4 in.) above
the drive top plate.
• The control room must provide slightly more make-up air, creating a
pressurized room. This slight pressurization prevents unfiltered air
drawing into the room.
• The drive is intended to operate in conditions with no special precautions
to minimize the presence of sand or dust, but not in close proximity to
sand or dust sources. IEC 721-1 defines this as being less than 0.2 mg/m
3
of dust.
• If outside air does not meet this condition, filter the air to EU EN779
Class F6 or ASHRAE Standard 52.2 MERV 11. These ratings address a
high percentage of the 1.0...3.0 μm particle size. Clean or change filters
regularly to ensure proper flow.
• The make-up air must be between 0...40 °C (32...104°F).
• Relative humidity must be less than 90% non-condensing.
• If the ducting length is greater than 3 m, an axial fan must be installed at
the air outlet. The exhaust flow of the axial fan must be greater than the
total flow amount of all the centrifugal fans in this air duct.
• The ducting must not be shared by the two cabinets.
• The distance from each side of the hood to the corresponding side of the
fan must not be less than 60 mm (2.4 in.).
• Do not cover any medium voltage or control power wires which enter or
exit from the top of the cabinet.
• The air duct outlet must slope downward to prevent water damage.
• Screens must be installed in the air duct outlet.
ATTENTION: The Isolation Transformer Cabinet and the Power Module/LV
Control Cabinet must be ducted separately.