S&C Mark VI Instructions For Installation Manual page 40

WIRING AND ADJUSTING THE SWITCH OPERATOR
Step 59
Check the amount of unwind in the output
shaft:
a. Place the selector handle in the coupled
position. Operate the Mark VI CS-1A Switch
Operator electrically to open the Circuit-
Switcher and determine the amount of
overtravel in the opening direction by releas-
ing the motor brake and noting how far the
output shaft "unwinds."
b. Release the motor brake by unlatching the
manual operating handle and pivoting it rap-
idly, with a snap motion, toward its cranking
position. Then return the manual operating
handle to its storage position. There should
always be a certain amount of "unwind"
or relaxation of the output shaft (in both
the open and closed positions) to indicate
that Circuit-Switcher has been driven to a
positive-toggle position against its open (or
closed) stops.
If adjustment is needed:
a. Remove the motor-circuit fuseholder.
b. Increase the amount of "unwind" by decreas-
ing the opening-stroke travel-limit disc (to
increase travel) one indicator-plate number
at a time. See Figure 57. Keep in mind that
the direction of disc rotation is always the
same as that of the output shaft. The output
shaft should never have suffi cient "unwind"
when the switch operator is decoupled to
cause rotation of the travel-limit discs.
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