Description
Avtron Outdoor Resistive Load Bank • Part Number K975A 994213
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SECTION II
DESCRIPTION
Avtron Part Number K975A 994213 Load Bank is an outdoor unit designed to absorb a balanced
resistive load of unity power factor, at a specified 3-phase voltage. The total load capability of the
K975A Load Bank is 2500 kW at 480 VAC, 3-phase, 60 Hz. The load steps are 50, 50, and (24) at
100 kW.
The K975A 994213 Load Bank contains two 15 H.P. blower motors that operate from 480 volts, 3-
phase, 60 Hz, and provide the necessary cooling air for the load elements. The blower motors derive
voltage from the main bus and are controlled by motor starter contactors. Overcurrent protection is
provided by fuses and overload relays. When an external source is used for blower and control
power, its voltage may be independent of the LOAD voltage of the generator under test. The blower
air delivery is 27,000 CFM at 1.4 inch of static pressure.
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C A U T I O N
This Load Bank should never be used without the fan blower motors
operating. Inadequate cooling airflow will result in resistor elements
overheating and a definite fire hazard.
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Two airflow switches are provided to monitor the flow of cooling air. These differential pressure
switches are electrically interlocked with the load application controls to prevent load application if
the blowers are not working properly.
Two thermocouples are provided to sense the exhaust air temperature. The sensors are located at the
top of each exhaust heater case. The thermocouples are wired to an adjustable temperature sensor
set at a trip point of 350F. If the trip point is exceeded, it will prevent load application.
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