Rockwell Automation 20G PowerFlex SCR Bus Supply - Manual (Page 17)

Installation/Wiring 1-3
PowerFlex SCR Bus Supply User Manual
Publication 20S-UM001G-EN-P
Minimum Mounting
Clearances The cabinet air inlet and outlet areas for each SCR Bus Supply must be a
minimum of 200 cm
2
(31 in.
2
). The length-to-width ratio must not exceed
4:1.
Figure 1.2 Mounting Clearances
Ambient Operating Temperatures
The PowerFlex SCR Bus Supply is designed to operate at 0…40 °C
(32…104 °F) ambient without derating. For operation in ambients above
40 °C up to 50 °C (104 °F up to 122 °F), the PowerFlex SCR Bus Supply
output Amps must be derated by 1.2% per 1 °C for 400A unit, and by 1.0%
per 1 °C for 600A and 1000A units.
Ensure that proper cooling is provided to the SCR Bus Supply to maintain
the 40 °C rated specification. If the ambient temperature is exceeded, apply
the proper derate factors. Add exhaust fans to the front or top of the
enclosure bay and provide a filtered opening at the bottom of the cabinet
bay.
The SCR Bus Supply watt losses (from specification section) are 1200W at
400A, 1600W at 600A, 2700W at 480V 1000A, and 2800W at 690V
1000A. The three-phase AC line reactor watt losses are listed in the 1321
Power Conditioning Products Technical Data (publication 1321-TD001).
Because of the internal design of the SCR Bus Supply, it is NOT
recommended to rely on an air dam surrounding the SCR Bus Supply.
It is recommended that the system integrator completes a thermal evaluation
to ensure adequate cooling to maintain proper operating conditions for each
cabinet or bay. A minimum air exchange of 725 CFM per SCR Bus Supply
is recommended.
120 mm
(4.7 in.)
120 mm
(4.7 in.)
150 mm
(6 in.)
300 mm
(12 in.)
Air Flow Air Flow Air Flow
Air Outlet
PowerFlex
SCR
Bus Supply
PowerFlex
SCR
Bus Supply
Air Outlet
Air Inlet Air Inlet
Refer to Appendix A for detailed dimension information.
below fan