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6.
With the mechanism closed, the moving contacts
should be within 1/16-inch of full engagement, as
measured between the top edge of the moving contact
insulator and the bottom edge of the contact box side
plate as shown in Figure 10. To obtain this dimension,
adjust the effective length of the insulated operating
link by adjusting the attaching point for the contact
arm assembly in the slotted hole of the link. Be sure
to retighten the elastic stop nut when adjustment is
completed.
Complete contact box assembly
To replace the complete contact box assembly proceed as
follows:
1.
Detach the opening springs and disconnect the toggle
link from the bell crank as described in "Moving Contact
Arm Assembly" section, Steps 1 and 2.
2.
Remove the hex nuts, lockwashers and flatwashers
that retain terminal leads to bushing rods.
3.
Remove four hex head machine screws with pre-
assembled lockwashers that secure the contact
structure to the head casting. Contact structure
removed from switch is shown in Figure 11.
4.
To replace contact structure:
A.
Slip toggle link over bell crank lever and secure
with C-ring.
B.
Attach contact structure to head casting with hour
hex head machine screws with lockwashers.
C.
Attach opening springs to toggle link.
D.
Install moving and stationary contact assemblies, if
necessary, as described previously.
E.
Attach terminal leads to bushing rods with flat-
washers, lockwashers and hex nuts.
Actuator mechanism
The actuator mechanism requires little attention. When the
switch is removed from service for its periodic maintenance
inspection, check the condition of the selector switch
contacts, and holding switch contacts if so equipped.
Also check the condition of the wiring, motor and cams.
Components of a standard actuator mechanism are shown
in Figure 12. Figure 13 shows the wiring diagram of the
switch actuator with the various accessory connections
shown in dotted lines.
Figure 12. Standard actuator mechanism with auxiliary
switch option.
Figure 13. Wiring diagram with accessory connections
indicated by broken lines.
TYPE NR OIL SWITCH MAINTENANCE INSTRUCTIONS MN230001EN February 2016
Pin
Elastic Stop Nut
Drive Lever
White Motor Lead To
Terminal G
Red Selector Switch
Lead To Terminal 2
Terminal Strip For
Customer Connections
S-3
2
M
SA
1
G
0
+
+
Legend
0
Auxiliary Circuit
1
Holding Circuit
G Ground
2
Closing Circuit
3
Opening Circuit
4
Auxiliary Circuit
M AC Motor
S-1 Selector-switch opening-circuit contacts
1
S-1 Selector-switch closing-circuit contacts
2
S-3 Auxiliary switch actuated directly from main shaft
SA Surge arrester
Operating Shaft Drive Lever
Drive Motor
Selector Switch
Black Selector Switch
Lead To Terminal 3
Closing Spring
5 Pin / 3 Conductor Or
6 Pin / 6 Conductor
Receptacle
S-2
S-3
S-1
1
1
2
S-1
1
2
3
4
+
+
+
9
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