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MAINTENANCE
RECOMMENDED INSPECTION AND
MAINTENANCE TYPES
NOTE:
Refer to the SAFETY section of this
manual for important information.
1. Acceptance Inspection
This inspection confirms that the contactor is
complete, correct as specified and undamaged
from shipment. The procedure for this inspection
is outlined in the RECEIVING, INSPECTION
AND HANDLING section of this manual.
2. Patrol Inspection
Inspection is made of the condition of the
contactor while it is energized. Check that no
unusual sounds or smells exist externally. Check
for any abnormal discoloration due to
overheating. Inspect for signs of damage to the
insulation frame, OPEN/CLOSE indicator and
other components.
Inspection Frequency: Once every 6 months
3. Periodic Inspection
Inspection is performed with the contactor de-
energized. The lubrication of sliding and rotating
parts is checked and the mechanism is lubricated
if needed.
Inspection Frequency: Once every 1-2 years or
every 20,000 operations (normal).
NOTE:
Refer to Table 2 for the schedule of
Periodic Inspections.
4. Unscheduled Inspection
Inspections are implemented as required.
Inspection Frequency: As needed
NOTE:
The inspection frequency and points to
be inspected may vary from the above
recommendations depending on the
status of use, frequency of switching and
other factors.
Table 1 - Tightening Torque
Screw Nominal
Diameter
Tightening Torque
M4
15-20 kgf-cm (13-17 in-lb)
M5
30-40 kgf-cm (26-34 in-lb)
M6
50-65 kgf-cm (43-56 in-lb)
M8
120-150 kgf-cm (9-11 ft-lb)
M10
250-315 kgf-cm (18-23 ft-lb)
M12
450-565 kgf-cm (32-41 ft-lb)
