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SECTION 10: PPX NEMA Pump Panels
10.1 Description
The PPX series of pump control panels consist of a
manually operated fusible disconnect switch and a
magnetic contactor with a solid-state overload housed
in a NEMA enclosure. The fusible disconnect switch
provides motor branch short-circuit protection. The
contactor is proven in field applications where wide
voltage fluctuations may occur. The overload relays
provide motor overload protection.
The rainproof enclosure allows all routine operations to
be performed from the outside without opening the door.
The fusible disconnect switch handle is mechanically
interlocked with the enclosure door to prevent opening
the door before the handle is moved to the OFF position.
For better access during repair or inspection, the cover
may be removed by lifting the door upward and outward.
A latch is provided to prop the door open on windy days.
The overload relay incorporates a dial for field adjustment
of tripping current.
Install in conformance with National Electrical Code
and all local codes. Branch circuit protection must be
provided.
These controllers have all components arranged for easy
access from the front. The circuits are relatively simple
and circuit components are selected for trouble-free
operation. Periodically, depending on the environment
and duty, the panel should be inspected and cleaned.
Inspect all devices for loose bolts and nuts.
Figure 10-1: Typical NEMA Enclosure
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