18
E VOLUTI ON S E R I E S E9 0 0 0
M OTO R CO N T R O L C EN T ER
Exhaust fan installation for NEMA 1 enclosure
Exhaust fan installation for UL type 12 enclosure
and arc-resistant vented fan shields
—
13A
—
13A
Exhaust fan for
NEMA 1 enclosure
—
13C
Exhaust fan for UL
Type 12 enclosure
—
13B
—
13B
Elevated roof for
3000/3200 A main bus
High heat loss main bus splice joints and/or
components, including certain solid state power
devices, may require removal of excess heat to the
MCC exterior environment. This is accomplished by
the utilization of exhaust fans.
Exhaust fans, if required, are delivered to the
installation site as a separate shipping item. Fans
must be unpacked, checked for collateral damage,
and installed over the top rear conduit entry space
of the appropriate MCC section.
Installation involves connecting two mated control
power harness ends for each fan assembly. One
harness is located within the fan assembly. The
corresponding mated harness end is coiled and
secured inside the top rear of the section being
ventilated.
Fan Assembly
Top Rear Cover Location
—
13C
Filter Assembly
UL Type 12 Fan Assembly
Arc-resistant VFD Fan Shield
Note:
For details on inlet filter maintenance,
see Filter Maintenance on page 33.
For 3000/3200 A main bus, an elevated roof for
ventilation is required. This elevated roof is located
on the rear half of the top cover and is 5-inch tall as
shown in Figure 16B.
If, upon delivery, it is found that standard rear top
section covers are in place on the section requiring
ventilation, the covers must be removed and
discarded. The exhaust fan assembly can then be
installed as shown in Figure 13B.
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