4
Cam Adjustment–Group 9:
MAR/DCR10, 50, 90–Part Turn Models
(new style)
Cam adjustments (if required), as follows:
Open (counter-clockwise) direction of travel:
a.
Loosen setscrew on Cam 2 (and Cam 4 for auxiliary
switches) to give the cam(s) a finger tight grip on the shaft.
Rotate cam(s) in a clockwise direction away from the
switch.
b.
Manually move the actuator to the full “open” (CCW)
position.
c.
Rotate Cam 2 (and Cam 4) counter-clockwise until it
engages the switch roller and the switch just “breaks”.
You should hear a light click.
d.
Tighten the setscrew on Cam 4.
e.
If auxiliary switches were provided, rotate Cam 4 about 2
degrees in the counter-clockwise direction. Then tighten
the setscrew. This will ensure that Switch 4 “makes” when
the actuator reaches the full open position.
f.
If travel is not correct, repeat steps (a) through (e).
Close (clockwise) direction of travel:
a.
Loosen setscrew on Cam 1 (and Cam 3 for auxiliary
switches) to give the cam(s) a finger tight grip on the
shaft. Rotate cam(s) in a counter-clockwise direction
away from the switch.
b.
Manually move the actuator to the full “close” (CW)
position.
c.
Rotate Cam 1 (and Cam 3) clockwise until it engages the
switch roller and the switch just “breaks”. You should hear
a light click.
d.
Tighten the setscrew on Cam 1.
e.
If auxiliary switches were provided, rotate Cam 3 about 2
degrees in the clockwise direction. Then tighten the
setscrew. This will ensure that Switch 3 “makes” when the
actuator reaches the full open position.
f.
If travel is not correct, repeat steps (a) through (e).
Replace the cover and tighten all flange bolts.
Replace manual de-clutching knob and tighten setscrew.
The actuator is now ready for electrical operation
Cam Adjustment–Group 9: MAR/DCR10,
50, 90–Multi-Turn Models
Cam adjustments (if required), as follows:
Open (counter-clockwise) direction of travel:
a.
Manually operate the actuator in the “open” (CCW)
direction of travel and note the direction of rotation of the
cams: either clockwise or counter-clockwise as view from
above the cam stack.
b.
Loosen setscrew on Cam 1 (and Cam 3 for auxiliary
switches) to give the cam(s) a finger tight grip on the shaft.
c.
Rotate Cam 1 (and Cam 3) in the same direction as
noted in step (a) until it engages the switch roller and the
switch just “breaks”. You should hear a light click.
d.
Tighten the setscrew on Cam 1.
e.
If auxiliary switches were provided, continue to rotate
Cam 3 about 2 degrees in the same direction. Then tighten
the setscrew. This will ensure that Switch 3 “makes” when
the actuator reaches the full open position.
f.
If travel is not correct, repeat steps (a) through (e).
Close (clockwise) direction of travel:
a.
Manually operate the actuator in the “close” (CW) direction
of travel and note the direction of rotation of the cams:
either clockwise or counter-clockwise as view from above
the cam stack.
b.
Loosen setscrew on Cam 2 (and Cam 4 for auxiliary
switches) to give the cam(s) a finger tight grip on the shaft.
c.
Rotate Cam 2 (and Cam 4) in the same direction as
noted in step (a) until it engages the switch roller and the
switch just “breaks”. You should hear a light click.
d.
Tighten the setscrew on Cam 2.
CAM 4
CAM 3
CAM 2
CAM 1
Switch 4
Switch 3
Switch 2
Switch 1
CAUTION
To prevent ignition of hazardous atmospheres, do not
remove actuator cover while curcuits are live.
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