GE BreakMaster Installation And Maintenance Manual page 21

BreakMaster Load Interrupter Switch
4. Cam Adjustment Procedure
a. Make adjustments with all control power off.
b. Loosen the cam set screws until flush with the cam surface. The cams should rotate freely.
c. Using the manual handle, operate the interrupter switch to the closed position, rotate the BG cam in the
direction of the switch motion to close and set the cam 1/8" past the BG microswitch "click".
d. Using the manual handle, operate the interrupter switch to the open position, rotate the BJ cam in the direction
of the switch motion to open and set the cam 1/8" past the BJ microswitch "click".
5. Verify Cam Adjustment
a. Verify the direct drive solenoid coil is disconnected.
b. Energize control power. Initiate the electrical operator.
When the motor starts to run:
1. Verify motor rotation.
2. Using the manual handle, throw the switch manually. The motor should be stopped when the primary switch
has operated.
3. Repeat this procedure in both directions. Fine cam adjustment may be required until the above operation is
satisfactory.
After you have followed Points 1 through 5, you are ready to test the electric motor operator utilizing the Direct
Drive Motor Assembly.
• Simply remove the lock out interlock jumper at Terminals M3 and M4.
• Reconnect the coil wiring at the solenoid.
• Then remove and store the manual handle.
• Now you will be ready to activate the motor drive through remote devices.
If you find the motor operator cutting off prior to the spring mechanism discharging in the intended direction,
adjust the particular cam and microswitch position so as to let the motor operator drive forward slightly longer.
If you find the operator overdriving, adjust the cam to cut the motor drive off earlier.
If Steps 4 and 5 are properly followed, there should be no need for adjustment under an electric operation.
Again, the importance is stressed of properly setting the cams prior to testing in the coupled position with the
motor drive assembly. Incorrect setting will cause damage. Please call GE if you have any questions.
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When the interrupter switch has a "shunt trip"
feature, the BK cam must be adjusted. With the
switch in the "shunt trip" position, rotate the BK cam
until the high point compresses the microswitch
The motor operator is designed to charge the spring assembly and travel the
operator assembly only to the point where the spring loaded mechanism opens
or closes the interrupter switch.
The motor drive does not physically open or close the switch contacts.
NOTE
and the contact "clicks."
!
REMEMBER