Description
Avtron Model LPH400 • Resistive Load Bank
Part Number LPH400D30693-1
2-2
GENERAL CONSTRUCTION
(Refer to Outline Drawing SB2975.)
The Control Panel is mounted in the Load Bank behind a sliding door. It is also sized for
mounting into a 19-inch rack enclosure. The control panel contains all the switches required to
operate the Load Bank. Full digital metering is standard and displays volts, amps, and kW with
individual phase selection. The Load Bank is constructed of aluminized steel, forming a rigid
structure. Mounted within this structure are the load element resistor assemblies, the cooling fan
and motor, the load step contactors, motor starter, motor overload relay, fuses and customer
connection load bus. The cooling air is drawn in from intake end (fan end) and both sides,
forced across the resistor elements and exhausted out the opposite end.
The unit is mounted on six-inch casters with one set provided with wheel locks. The customer
connection access box is located on the intake side of the unit. Load connection is made on the
intake end in the load connection compartment (Customer Connection Access Box).
The Load Bank can operate at either 480 or 240 volts. A switch on the control panel (S7) will
switch the load from the high voltage configuration to the low voltage configuration. The fan
motor configuration also changes if powered from generator under test. The fan motor has
separate overload protection for high and low voltage operation. The voltage protection circuit
will protect the circuit if improper voltage mode is applied. However, it is always best to
confirm source voltage, then match control panel switches to proper configuration before
energizing the unit.
Lower voltages and different frequencies may be applied to the load circuit of the Load Bank.
Frequency change causes no derating of the load; however, the applied kW with a lower voltage
is computed with the following formula:
2
2
Rated
Applied
)
Rated
Voltage
(
)
Applied
Voltage
(
kW
kW
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C A U T I O N
Never exceed the rated voltage, because this will cause the Load
Bank to overheat. Do not apply DC voltages, because the
contactors do not have arc blowout magnets.
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C A U T I O N
External fan power may be required if a voltage different than
240/480 is being applied or a frequency other than 60 Hz. (See
Section III for further details.)
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