MAINTENANCE
Page 17
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)
