Dwyer Mark User Manual

Page 10

INSTALLATION PROCEDURE
1. Unscrew cover. Keep threads clean and free from damage.
2. Switches are set at factory when in counterclockwise

position. Index marks should appear as shown (Mark 1
only). Set screws, or holes in manual cams, (#2, 4 and 6) on
Closed switches will be directly above index marks.

2 Switch Unit #1 Open #2 Closed
4 Switch Unit #1, 3 Open #2, 4 Closed
6 Switch Unit #1,3,5 Open #2,4,6 Closed

3. Attach appropriate Drive Yoke onto two pins using a #6-32

screw provided. (Note: Coupling is a special spring temper
yoke or solid metal block. Do not attempt to fabricate your
own yokes.)

4. Attach mounting bracket (127-003 is shown) to switch

housing using 1/4˝ screws provided.

5. With actuator shaft rotated to its counterclockwise position,

spread the Drive Yoke and slip it down onto the square (or
rectangular) part of the actuator shaft. Attach bracket with
two hex cap screws. Before tightening screws, operate
control slowly with a wrench or power, and observe that
drive shaft and drive yoke are concentric and perpendicular
in complete stroke. Adjust position as required, and tighten
all the mounting screws. Check concentricity and
perpendicularity. Readjust per above steps as necessary.

ADJUSTMENT PROCEDURE
A. Using a wrench or power, rotate the actuator shaft to extreme clockwise position. All switches should change to their

opposite function.

B. The cam can be relocated and repositioned by loosening the set screw. To adjust manual cams, grasp cam on

knurled segment of cam surface. Simply rotate the cam on spline attached to the shaft. Feeling or sound of clicks
indicates 6º incremental adjustments. Stop rotating and release pressure on cam when it is at proper actuation
point. This allows cam to engage spline. Check the circuit to verify contact at proper point. Rotate shaft. Repeat
steps above as necessary. Lock manual cam on spline by tightening set screw provided for additional security.

C. Screw on cover and tighten against o-ring seal until cover does not turn.

See Pages 19-25 for wiring procedure, intrinsic safety parameters, relevant warnings and schematics.

MARK 1 AND 4 DIRECT DRIVE INSTALLATION