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5.1
MAINTENANCE PERIOD
5.2
DAILY INSPECTION
5.3
PERIODIC INSPECTION
Table 13
42
The maintenance period of the power regenerative unit is as follows.
Maintenance period: Within 18 months of shipping from the factory or within 12
months of being delivered to the final user, whichever comes first.
Check the following items with the system in operation.
S There should be no abnormal heat generation.
S The ambient temperature should not be too high.
S The cooling fan on the power regenerative unit should be operating normal-
ly.
Check the following items during periodic maintenance.
Always turn OFF the power supply before beginning inspection. Confirm that the
LED indicators on the front cover have all turned OFF, and then wait at least five min-
utes have elapsed before beginning the inspection. Be sure not to touch terminals
right after the power has been turned OFF. Doing so can result in an electric shock.
Periodic Inspections
Item
External terminals,
Are all screws and bolts tight?
mounting bolts connec
mounting bolts, connec-
Are connectors tight?
tors, etc.
Heatsink
Are the fins dirty of dusty?
Is there any conductive dirt or oil mist on
PCBs
the PCBs?
Is there any abnormal noise or vibration
Cooling fan
or has the total operating time exceeded
20,000 hours?
Is there any conductive dirt or oil mist on
Power elements
the elements?
Are there any irregularities, such as dis-
Smoothing capacitor
coloration or odor?
Inspection
Tighten loose screws and bolts firmly.
Reconnect the loose connectors.
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2×10
(4 to 6 kgScm
Clean off any dirt and dust with an air gun us-
ing dry air at a pressure of 39.2×10
58.8×10
Replace the boards if they cannot be made clean.
Replace the cooling fan.
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2×10
(4 to 6 kgScm
Replace the capacitor or power regenerative
unit.
Corrective Procedure
4
to 58.8×10
2
).
4
to
4
2)
Pa (4 to 6 kgScm
.
4
to 58.8×10
2)
.
4
Pa
4
Pa
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