MAINTENANCE
Page 21
MOUNTING
1) Remove the conductive nut from the vacuum interrupter
being replaced and attach it to the new vacuum
interrupter as shown in Fig. 10.
CONDUCTIVE NUT
0.5-1.0mm
2) Put the conductive collar on the upper part of the
vacuum interrupter (stationary terminal) and assemble
the vacuum interrupter.
3) Hold the vacuum interrupter and fasten bolt "B" (torque
to 120kg-cm or 102in-lb).
4) Push down the insulating flange and align the insulating
flange stud with the movable shaft of the vacuum
interrupter. Then, while turning the flange counter-
clockwise, insert it. (Install the insulating flange with only
3 to 4 turns, then stop).
Fig. 10
ADJUSTING THE MAIN CONTACT GAP OF THE VACUUM INTERRUPTER
1) With the control circuit energized, close the
vacuum contactor. Check that the armature is
attracted to the coil cores.
2) As shown in Fig. 11, turn the insulating flange until
the distance is 41.5mm or use the wear gauge
supplied.
3) With the adjustment made, hold the insulating
flange still with the hand and secure nut "A".
Note: -Arrange so that the movable conductor is
straight and flat.
-Check that the conductive nut does not rotate.
4) Turn off the control circuit power supply.
5) Operate manually to confirm that the vacuum
interrupters close simultaneously.
6) Operate the contactor electrically and check that
the main contact gap is 4mm +0.2mm. If
necessary, loosen nut “A” and turn the insulating
flange (clockwise or counterclockwise as
necessary) until the correct contact gap is
achieved. Then tighten nut “A”.
OPERATION CHECK
In a no-load condition, electrically operate the contactor through 20 operations to confirm normal
operation.
VACUUM
INTERRUPTER
WEAR
GAUGE
(SUPPLIED)
CONDUCTIVE
NUT
41.5mm
"A"
(M8 NUT)
INSULATING
FLANGE
Fig. 11 Adjusting the Main Contact Gap.
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