Operation
Avtron Model LPH 400 • Resistive Load Bank
Part Number LPH400D43233
4-1
SECTION IV
OPERATION
PURPOSE AND USE OF CONTROLS
1. BLOWER VOLTAGE SELECT Switch. This switch selects the appropriate voltage and
source for the fan motor. Set to proper position BEFORE operation.
2. LOAD VOLTAGE SELECT 240/208/416/480 Switch. This switch selects the 240 or
480 load voltage mode for the Load Bank.
3. CONTROL POWER INTEGRAL XFMR 240V/480V Select Switch. This switch is used
to set correct input voltage to the Control Transformer. This method should be used only
if voltage and frequency of the generator under test falls within the ranges specified in
the INSTALLATION section.
4. BLOWER START/STOP Pushbuttons. Pushbuttons are used to initiate fan motor start
and stop circuits.
5. FAN ROTATION ABC/CBA Switch. This switch is used to reverse the rotation of the
cooling fan if airflow is moving in the wrong direction. Always turn off fan by pressing
the BLOWER STOP switch and allow the fan to coast to a stop before changing the FAN
ROTATION ABC/CBA switch setting.
6. BLOWER FAIL Lamp. This lamp should momentarily light when power switch is
turned on. This shows the air safety circuit is working. This lamp's purpose is to warn
the operator of an air failure or improper cooling of load elements.
7. Digital Metering Package - Operation is performed through the front panel of the meter.
See supplemental manual for complete operation instructions.
8. MASTER LOAD ON/OFF Switch. This switch connects power to all load steps, thus
allowing all set load steps to be actuated at the same time. It is also a master load
disconnect.
9. kW LOAD Step Switches. The load in kilowatts is marked above each actuating switch.
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