Installation; Thermal Considerations - PowerTec 2000C Instruction Manual

Figure 13: Physical dimensions of the POWERTEC Model 3000C.

3.3 INSTALLATION

Figure 12 gives the basic dimensions of the 2000C
chassis. The basic dimensions of the Model 3000C are
shown in Figure 13. NEMA 1 dimensions are in Figure 1
on page vi.
When mounting the 2000C or 3000C chassis in an
enclosure, care should be exercised to avoid handling the
chassis by parts which may bend or come loose. This
especially applies to the plexiglass cover of the unit. Try
to support the chassis as much as possible by the outside
edges of the heatsink.
WARNING! : IF THE CHASSIS HAS BEEN BENCH TESTED
PRIOR TO INSTALLATION, CHECK TO MAKE SURE THAT
THE BUS CAPACITORS HAVE FULLY DISCHARGED BE-
FORE ATTEMPTING TO INSTALL THE CHASSIS.

3.4 THERMAL CONSIDERATIONS

The 2000C or 3000C chassis must be mounted in a
vertical position (fuses up) in a suitable enclosure. The
ambient temperature of the air immediately surrounding
the chassis may not exceed 55
When the chassis is installed in an enclosure there
must be at least 6" (150mm) of free space above and below
the chassis, this space allowed for the proper air flow
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C (131 F).
o o
through the heatsink fans. The chassis must be mounted
vertically to promote air flow through the heatsink. Avoid
mounting one chassis directly above another too closely
with the result that hot air from the lower chassis flows
directly up into the other chassis.
The NEMA 1 enclosure should be mounted verti-
cally in an area which allows a free flow of air around the
enclosure and through the heatsink fins on the back. Maxi-
mum ambient temperature of the air surrounding the NEMA
1 control should not exceed 40°C (104°F).
There must be at least 6" (150mm) of free air space
in all directions around the NEMA 1 enclosure. If there are
two units mounted directly in line vertically, there should
be at least 12" (300mm) between the units.
The size of the enclosure for the chassis units is
determined by the total heat dissipation within the enclo-
sure. The heat output of the controls is given in section 2.1
on page 2-1. Enclosures which use air flow for cooling
(NEMA 1, 1A, and NEMA 12 ventilated) must have an air
flow of 1 CFM (cubic feet per minute) for each 10 watts of
dissipation (1 cubic meter /minute for each 350 watts).
Totally enclosed units (NEMA 3,4, or 12) must allow
1 square foot of enclosure surface area (including front,
sides, top and bottom surface areas) for each 7 watts of
dissipation (75 watts per square meter).
For further information, consult POWERTEC's pub-
lication "THERMAL MANAGEMENT".
Model 2000C / 3000C Manual