22 S&C Instruction Sheet 719-500
Adjusting the Switch Operator
Adjusting the Auxiliary Switches
The auxiliary switch, which is permanently coupled to the
motor, includes eight contacts (terminals 11 through 26).
(If the optional position-indicating lamps are included,
six contacts are available: terminals 13 through 18 and
terminals 21 through 26.) These contacts are provided so
external circuits can be established to monitor switching
operations.
Each contact is operated by a cam-actuated roller. The
cams are individually adjustable in 4.5-degree increments
and can be positioned so roller engagement occurs at the
desired point in the operating cycle.
The “standard” configuration for the auxiliary switch
consists of four “a1” contacts (terminals 11 through 18) and
four “b1” contacts (terminals 19 through 26). Thus, with the
switch operator in the
Open
position, the “a1” contacts are
open and the “b1” contacts are closed. Conversely, with the
switch operator in the
Closed
position, the “a1” contacts
are closed and the “b1” contacts are open. A contact is
closed if its roller is disengaged from a cam. Conversely,
a contact is open if its roller is engaged by a cam. See
Figures 12 and 13.
Any auxiliary-switch contact being used must be
checked for proper operation after the switch operator
travel-limit discs have been adjusted. Check the auxiliary-
switch contacts for both
Open
and
Closed
positions of the
switch operator. To adjust the auxiliary switch contacts,
refer to Figures 12 and 13 and Figure 14 on page 24 and
proceed as follows:
STEP 1�
With the selector handle in the
Coupled
position,
operate the switch operator to the fully
Closed
position (manually or electrically).
STEP 2�
Remove the motor-circuit fuseholder.
STEP 3�
Determine which “a1” contacts are not in the
Closed
position. A contact is closed if its roller is
disengaged from a cam, and conversely, a contact
is open if its roller is engaged by a cam.
STEP 4�
For the “a1” contacts that are not in the
Closed
position, raise (or lower) the corresponding cam
toward its adjacent spring until the cam is sepa-
rated from the teeth of the inner gear. Rotate the
cam until it is in a position so that when lowered
(or raised) it will be disengaged from the roller.
Lower (or raise) the cam, making sure the teeth
are in mesh with the inner gear and that the cam
is disengaged from the roller.
STEP 5�
Reinsert the motor-circuit fuseholder.
Travel-Limit switch, auxiliary
switch and extra auxiliary switch
(Catalog number suffix "-Q")
Extra auxiliary switch
(catalog number suffix
"-W" or "-Z")
Figure 12� Open front view of switch operator "standard"
contact configuration�
Figure 13� Adjustment of cams on auxiliary switch�
Roller
Inner gear
Cam
(lowered
toward
adjacent
spring)
Adjacent
spring
