Installation
Avtron Outdoor Resistive Load Bank • Part Number K975A 994213
3-5
FAN/BLOWER MOTOR CONNECTION
The fan/blower circuit consists of fuses, a motor starter contactor, an overload relay, and the fan
motor. The blower input power connections are wired to TB2(1-3) located on the relay panel
assembly and are then wired directly to the main Load Bank bus.
Required power for the blower motor is 480V, 3-phase, 60 Hz, 42 amps/phase.
Make sure that the correct phase rotation is wired to the fan motor. Improper phase rotation will
cause the fan to run in the reverse direction. The cooling air should be pushed from the fan, across
the resistor elements, and out the top exhaust hood/duct. This phase rotation check is mandatory
each time the source or fan connections are changed.
If external 480 volt power is provided, safe practice dictates that the fan power be wired through a
safety disconnect switch that can be locked out.
LOAD CONNECTIONS
On K975A 994213 units, quick connect cam-lok style connectors are installed on the outside corner
of the Load Bank frame. All nine connections per phase and the three ground connections must be
made prior to applying any load. The connectors are provided with mating connectors. Use these
mating connectors on interconnection load cable. Interconnection cable (by others) should be 4/0
cable.
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W A R N I N G
Cam-lok style connectors are factory-wired internally to the load bus
within the Load Bank. Unused connections will be live. It is
mandatory to use all nine connections per phase. Any exposed
connection requires a factory-provided protective cap be installed.
Any lost, damaged, or heat stressed cam-lok style connector or cover
must be replaced prior to use. Failure to follow these precautions
may result in death or injury to personnel.
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The ampacities of these load connections are shown on schematic diagram 997418 and outline
drawing SB3833.
After installation/connections are complete, verify proper phase to phase clearances on all load
wiring, bus bar, and hardware. Adjust or insulate to suit if required.
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