Operation
Avtron Model LPH 400 • Resistive Load Bank
Part Number LPH400D43233
4-3
C A U T I O N
DO NOT operate the Load Bank over the rated voltage as this will
cause catastrophic failure in the Load Bank.
DO make sure that the VOLTS Select switch is in the proper
position before applying load.
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6. Move the CONTROL POWER INTEGRAL XFMR 240V/480V selector switch to the
voltage that matches the generator under test. Press the control power ON button.
7. Depress the BLOWER START pushbutton. Verify air flow is in the correct direction. If
not, shut down fan by depressing the STOP pushbutton. Wait until fan blade stops
rotating, then switch fan rotation switch ABC/CBA. Restart and verify airflow.
Upon energizing the fan, the red BLOWER FAIL lamp will light momentarily until the
air switch detects sufficient cooling air, at which time it will go out, applying power load
switches. If at any time, there is insufficient cooling air to the elements, this safety
switch will drop out the load and the red BLOWER FAIL lamp will light.
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C A U T I O N
The operation of the fan is vital to the safe operation of this Load
Bank. When the BLOWER START pushbutton is depressed, the
BLOWER FAIL light will come on momentarily until the blower
accelerates up to its operating speed, at which time the light will
go off. If the air switch prevents the load from being applied, do
not bypass this switch. If the BLOWER FAIL light stays on for
more than a few seconds, shut down the Load Bank and do not
operate the unit until the problem is corrected. (Refer to Section I,
SAFETY CONSIDERATIONS, of this manual.)
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8. With the MASTER LOAD switch in the OFF position, verify that the voltage displayed
by the Digital Meter matches the position of the LOAD VOLTAGE Select switch.
9. The resistive loading is selected by toggle switches, using any one or combination of
toggle switches to make up a given load.
10. By placing the MASTER LOAD switch to the ON position, the preselected load will be
applied to the power source.
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