Rockwell Automation 7000 PowerFlex Medium Voltage Air-Cooled (B Frame) Installation - ForGe Control - Manual (Page 51)

Rockwell Automation Publication 7000-IN007E-EN-P - June 2014 51
Drive Installation Chapter 3
The following requirements are mandatory 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 7000 drive air
flow system. For heat pipe models, ensure a minimum top clearance of
600 mm (24 in.) above fan exhaust openings.
• 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 7211 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 ASHRAE
(American Association of Heating, Refrigeration and Air-Conditioning
Engineers) Standard 52.2 MERV 11 (Minimum Efficiency Reporting
Value). This filtration eliminates from 65% to 80% of the particulate in
Range 2 (1.0...3.0 μm) and 85% of the particulate in Range 3
(3.0...10.0 μm). Clean or change filters regularly to ensure proper flow.
• The make-up air must be between 2...40 °C.
• Relative humidity must be less than 95% non-condensing.
• Approximately 10% of drive losses will still be rejected into the control
room; address this issue as needed to maintain the temperature in the
control room within specification.
• Failure to maintain proper flow of cooling air into the control room can
result in the drive stopping on low differential pressure across the heat
sinks.
Power Cabling Access The drive’s cabinetry provides for either the top or bottom power cable entry.
Cable access plates are available on the top and bottom plates of the connection
cabinet; check your customer-specific dimension drawings for details.
To access the customer power cable terminations:
1. Open the door of the low voltage control compartment. The low voltage
control compartment is hinged on its left side. The power terminals are
behind the low voltage control compartment.
The key interlock prevents the low voltage control compartment from
swinging open unless the medium voltage source is locked out.
2. Turn each of the three latches on the right side of the low voltage
compartment one-quarter turn using an 8 mm hexagonal key wrench.
There is a pull handle provided on the right side of the low voltage
compartment.
3. Slowly pull the handle so the low voltage compartment swings out. The
power terminals are now visible.
The power cable access plates may require modification to suit the requirements.
Use the appropriate connectors to maintain the environmental rating of the
enclosure.