Operation; Purpose And Use Of Controls; Load Bank Operation; Operating Instructions - Lincoln Electric MASTER LOAD IM575 Operator's Manual

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PURPOSE AND USE OF CONTROLS

1. POWER ON/OFF switch - Turns on cooling fan
and powers remainder of control circuit. Red light
shows POWER ON.
2. BLOWER FAIL indicator - The purpose of the
BLOWER FAIL lamp is to warn the operator and
remove the load to the load bank in case of an air
failure or improper cooling of the load elements.
3. MASTER LOAD ON/OFF switch - The MASTER
LOAD switch connects power to all load steps,
thus allowing all load steps which are actuated to
load at the same time. It is also a master load
disconnect.
4. LOAD STEPS switches - The load in amps is
marked above each actuating switch. A load step
may be turned ON or OFF before or during a test
but will load the unit only when the MASTER
LOAD switch is ON. NOTE: For DC loads, if the
polarity is not correct the load step switches will
not activate the load.
5. ANALOG METERS - Monitors load characteristics
DC and AC, Volts, and Amps.

LOAD BANK OPERATION

All tests start with control panel switches in the OFF
position.
CAUTION
Before energizing any load, verify that load voltage
does not exceed rated voltage of load bank.
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The unit is energized by turning the POWER switch
ON. This also energizes the cooling fan motor.
CAUTION
Do not attempt operation if fan is not running. Fan
inlet and exhaust must be unrestricted. The opera-
tion of the fan is vital to the safe operation of this Load
Bank. If BLOWER FAIL indicator light comes on and
stays on for more than a few seconds without the load
dropping out, shut off the POWER switch at once.
Remove all power to the unit and check for proper
operation of fan safety circuit. Failure to correct cool-
ing air loss condition will result in destruction of the
Load Bank. Refer to the Load Bank Safety section
of this manual.
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OPERATION

OPERATING INSTRUCTIONS

1. Connect Load Bank to 120 volts, single phase, 60
Hz power source.
2. Connect a wire from the Load Bank frame ground
stud to power source frame.
3. Connect power source frame to a good earth
ground.
4. Connect appropriate power source leads to Load
Bank.
5. With POWER and MASTER LOAD switches in the
OFF position, start the generator.
6. Place the POWER switch in the ON position.
The red POWER lamp will light.
7. Position the LOAD STEPS switches for the
desired load.
8. Turn on the MASTER LOAD switch to apply
desired load. Load steps may be added or delet-
ed at any time.
9. Use analog meters to monitor applied load.
10. After running tests, remove the load by turning off
the MASTER LOAD switch. Residual heat may
be removed from the Load Bank by allowing the
blower to run a few minutes after load is removed.
Although not required for maintaining Load Bank
integrity, this procedure may guard operating per-
sonnel from possible burn injuries.
DO NOT allow objects to enter or block screens.
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11. Place the POWER switch to the OFF position.
12. Shut down all power sources to the Load Bank.
13. Disconnect the power source cables to the Load
Bank.
MASTER LOAD 750
WARNING
DO NOT touch the exhaust screen
during operation. The screen will
become hot from the exhausted heat
and may cause a serious burn.
Refer to the Load Bank Safety sec-
tion of this manual.
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