Honeywell ML6131 - Manual (Page 7)

ML6131 DIRECT COUPLED ACTUATOR
7 63-2498—2
Auxiliary Potentiometers
The 200976 Auxiliary Potentiometer mounts on the face of
certain ML6131A actuators as shown in Fig. 11. The
potentiometer shaft has a slipping collar, which means that if
one of the two limits of the potentiometer is exceeded, the
collar will continue to rotate, causing no damage to the
potentiometer itself. To mount the potentiometer on the
actuator:
1. Turn the potentiometer to align the shaft key with the
slot in the potentiometer drive.
2. Tilt the potentiometer slightly so the key faces down
toward the slot.
3. Insert the potentiometer into the slot, and push down so
the potentiometer is flush with the actuator body and the
bracket is aligned over the screw hole.
4. Insert the screw provided into the hole and fasten
securely.
IMPORTANT
Failure to follow the calibration procedures can result
in improper resistance values at desired stroke.
To Calibrate the 200976A,C:
IMPORTANT
Remove the range stop pins and minimum position
setscrews prior to calibration.
1. Drive the actuator fully closed (0°) to fully open (90°)
and back again to the fully closed position. This must be
done to receive the correct resistance readings at the
appropriate degree of stroke.
2. Check the resistance values of the potentiometer with
an ohmmeter at intervals in the stroke while referring to
the table in Fig. 11 and resistance information provided
in the Specifications section.
3. Replace the range stop pins and/or the minimum
position setscrews using the appropriate procedures.
Fig. 11. ML6131 with field-addable potentiometer.
60
45
45
60
CW
CCW
COM
M10251B
MOTOR
POSITION RW
RESISTANCE RB
RESISTANCE
FULLY CW
24V (COM-CW)
FULLY CCW
24V (COM-CCW)
0 OHMS
0 OHMS
500 OR
2000 OHMS
AUXILIARY POTENTIOMETER
MOTOR
ROTATION
AUXILIARY POTENTIOMETER LEADS
RW OHMS RB OHMS
CCW INCREASE
DECREASE
DECREASE
INCREASE CW
FIELD-ADDABLE AUXILIARY POTENTIOMETER
500 OR
2000 OHMS
B
R
W