42
5.1
MAINTENANCE PERIOD
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.
5.2
DAILY INSPECTION
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.
5.3
PERIODIC INSPECTION
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.
Table
13
Periodic Inspections
Item
Inspection
Corrective Procedure
External terminals,
mounting bolts connec
Are all screws and bolts tight?
Tighten loose screws and bolts firmly.
mounting bolts, connec-
tors, etc.
Are connectors tight?
Reconnect the loose connectors.
Heatsink
Are the fins dirty of dusty?
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2
×
10
4
to 58.8
×
10
4
Pa
(4 to 6 kg
S
cm
2
).
PCBs
Is there any conductive dirt or oil mist on
the PCBs?
Clean off any dirt and dust with an air gun us-
ing dry air at a pressure of 39.2
×
10
4
to
58.8
×
10
4
Pa (4
to
6 kg
S
cm
2)
.
Replace the boards if they cannot be made clean.
Cooling fan
Is there any abnormal noise or vibration
or has the total operating time exceeded
20,000 hours?
Replace the cooling fan.
Power elements
Is there any conductive dirt or oil mist on
the elements?
Clean off any dirt and dust with an air gun using
dry air at a pressure of 39.2
×
10
4
to 58.8
×
10
4
Pa
(4 to 6 kg
S
cm
2)
.
Smoothing capacitor
Are there any irregularities, such as dis-
coloration or odor?
Replace the capacitor or power regenerative
unit.