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Fig. 6. Range stop pin properly inserted.
SCREWDRIVER
Fig. 7. Lifting a range stop pin out of its slot.
Minimum Position Setscrew
Certain ML6131 models are equipped with two tapped holes
located in the plastic housing at the top of the actuator. These
holes can be used with the minimum position setscrew and
locknut inside the 4074ENJ Bag Assembly (see Fig. 6). The
setscrew provides for a 0° to 30° minimum position
adjustment.
NOTE: Before starting operation, note that the 1/4 in.
minimum position setscrew limits closing motion,
while the range stop pin limits opening motion.
RANGE STOP PIN
ACTUATOR PLATES
C W
C O M
C C W
M10246A
M2065
ML6131 DIRECT COUPLED ACTUATOR
1. Determine the direction of the desired closing rotation.
2. Move the actuator to the position fully opposite the
desired closing rotation (if cw closing rotation is desired,
move the actuator to the full ccw position).
3. Determine the correct hole for the setscrew using Fig. 8
and the results of step 1.
THIS SETSCREW
CORRESPONDS WITH
CLOSING IN THE
CW DIRECTION
Fig. 8. Setscrew location for ML6131.
CAUTION
Equipment Damage Hazard.
Improper hub positioning or hole selection can
permanently damage the device.
Avoid backdriving the actuator with the setscrew.
4. Remove the red cap from the desired hole. Leave the
other cap in position. The caps ensure that dust and
other impurities do not enter the gear train through
unused holes.
5. Thread the locknut fully onto the 1/4 in. setscrew.
6. Insert the setscrew into the desired hole, turning
clockwise until resistance is encountered or the locknut
contacts the housing.
7. If resistance is met before the setscrew is fully inserted,
stop and review the initial setup procedures as detailed
in steps 1 through 3.
8. Determine the angle of minimum position required for
the application. With the setscrew fully inserted, the
minimum position is 30°. With the setscrew fully out, the
minimum position is 0°.
9. Using the conversion of approximately 1.7 angular
degrees of shaft rotation per turn of the setscrew, back
the screw out of the housing and stop slightly short of
the calculated position. This allows the setscrew to be
set accurately while taking air flow measurements.
IMPORTANT
After initiating step 10, the setscrew cannot be
turned into the housing without returning the actuator
to the fully open position (as determined in step 1).
The actuator follows the setscrew without damaging
the housing only when backed out of the housing
(turned ccw).
5
THIS SETSCREW
CORRESPONDS WITH
CLOSING IN THE
CCW DIRECTION
M10247
63-2498—2
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