Operation
Avtron Model LPH400 • Resistive Load Bank
Part Number LPH400D30693-1
4-3
5.
Place the LOAD VOLTAGE SELECT switch to the correct voltage to test the generator.
6.
Start the generator to be tested. After unit stabilizes at operating speed, temperature,
voltage, and any other required condition for testing per manufacturer’s instructions,
proceed to step 7.
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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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7.
On standard units with external 120V control source, turn the CONTROL POWER EXT
120V switch to the ON position. On units with Option 1 (internal power derived from the
generator under test), 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.
8.
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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