Maintenance
Avtron Model LPH400 • Resistive Load Bank
Part Number LPH400D30693-1
5-2
THREE MONTHS OR 500 HOURS
1.
Remove access panels and screens.
2.
Inspect the load resistors for mechanical breakdown which is demonstrated by excessive
sagging of the elements. Replace with new resistor elements, support rods, and insulators
as required.
3.
Inspect for broken ceramic insulators. Replace with new ceramic insulators if any cracks
are found. Minor chips (less than 1/8" diameter) are acceptable and not cause for
replacement.
4.
Inspect for loose hardware or loose connections. Tighten where required.
5.
Inspect all connections for oxidation or corrosion. Clean the connection or replace the
hardware where required.
6.
Verify that the airflow switch works properly.
7.
Inspect all contactors to make sure that the contacts are not severely pitted or corroded.
The contacts must move freely and be properly seated.
8.
Clean all dirt and debris out of the Load Bank. This can be accomplished by blowing the
inside of the unit with clean, dry compressed air.
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W A R N I N G
Use only clean, dry compressed air (not to exceed 40 PSI). Eye
protection must be worn when cleaning with compressed air. Do
not direct compressed air against skin.
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9.
Inspect all the wiring for any sign of insulation failure, especially where wiring is close to
resistor case sheet metal or element support rod or clip.
10.
Care must be taken in repairing or replacing current transformers. If one is found to be
defective, mark all leads before removing to ensure connecting new C.T. properly, since
proper phasing is important.
11.
Inspect for any signs of heat stress on connections. This could be caused by loose
hardware or corroded connection. Repair or replace as condition warrants.
