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1.6 MAINTENANCE
1.6.1 Periodical Inspection
7200M3 requires very few routine checks .It will function longer if it is kept clean cool and dry, while
observing the precautions listed in “Location” (Par.1.3). Check for tightness of electrical connections,
discoloration or other signs of overheating. Use Table 1.7 as the inspection guide. Before servicing, turn
OFF AC main circuit power and be sure that CHARGE lamp is OFF.
Table 1.7 Periodical Inspections
Component
Check
Corrective Action
Loosened screws
Tighten
External
Terminals, Unit
Mounting Bolts,
Connectors, etc.
Loosened connectors
Tighten
Cooling Fins
Build-up of dust or dirt
Blow with dry compressed air of 392
×
10
³
to
588
×
10
³
Pa[57 to 85 1bs.. in² (4 to 6 kg.
cm²)]pressure..
Printed Circuit
Board
Accumulation of conductive dust
or oil mist
Clean the board.
If dust and oil cannot be removed, replace the
inverter unit
Cooling Fan
Abnormal noise or vibration.
Whether the cumulative operation
time exceeds 20,000 hours or not
Replace the inverter unit.
Power Elements
Accumulation of dust or dirt
Smoothing
Capacitor
Discoloration or odour
Replace the inverter unit.