Description
Avtron Model LPH 400 • Resistive Load Bank
Part Number LPH400D43233
2-1
SECTION II
DESCRIPTION
The Model LPH400 Load Bank is a portable, primarily indoor, self-contained unit for
electrically loading and testing generators. The Load Bank is rated at 400 kW at 240/480 volts.
The available load steps are 100 kW, 100 kW, 100 kW, 50 kW, 25 kW, 10 kW, 10 kW, and
5 kW. All load steps are selected by toggle switches. The Load Bank provides a balanced load
for 3-phase generators within the range listed above. Single phase loads are 2/3 the normal 3-
phase load. Do not run fan power from bus if single phase testing.
The fan motor is a 3 HP, 3-phase motor which operates from 208-230/460 volts, 3-phase, 60 Hz
power. The fan motor obtains power from either the power source under test (fan motor
connected to Load Bank main load bus) or from a remote source (external power source). When
operating from the power source under test, the motor circuit connects the motor for high or low
voltage. The unit will test 240/480 volt, 3-phase, 60 Hz generators without any wiring changes.
It can be used to test 60 Hz, 50 Hz, or 400 Hz generators; however, the fan motor and control
circuit power must be supplied by separate 60 Hz sources when testing 50 Hz or 400 Hz
generators. For separate 60 Hz fan motor power connection, see Section III. Control power is
115 VAC, 60 Hz and is provided by an integral 240/480V to 115V control transformer.
Fan failure protection is provided in two ways. A differential pneumatic pressure air switch
(S51) senses the airflow through the Load Bank. An additional slave relay (K30) is activated
only if power is applied to the fan motor terminals. This slave relay will disconnect control
power to all load contactors should the fan power be disconnected, the motor overload trip out,
or the air inlet screens become blocked.
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C A U T I O N
This Load Bank should never be used without the fan motor
operating. Inadequate cooling airflow will result in resistor
elements overheating and a definite fire hazard.
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GENERAL CONSTRUCTION (Refer to Outline Drawing SB2975.)
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