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NOTE: Series 3 Motors are shipped with auxiliary switch
cams that permit acceptance of 220736A,B Inter-
nal Auxiliary Switch Kits. Refer to Form no. 63-
2228 for 220736A,B Installation Instructions.
Auxiliary Switch Adjustment
1. Remove the top cover from the motor to gain access to
the motor terminals and auxiliary cams.
2. Disconnect the controller from the motor.
3. Connect a potentiometer to the motor as shown in Fig. 6.
4. Using the potentiometer, drive the motor to the position
where the auxiliary equipment is to be switched.
5. For a 1° switch differential, check continuity of the auxil-
iary switch contacts R-B and rotate the cam as follows:
a. If the contacts are open, rotate the cam clockwise
until the R-B contacts close.
b. If the contacts are closed, rotate the cam counter-
clockwise until the R-B contacts open.
6. For a 10° switch differential:
a. Spring return models: rotate the cam approximately
180° so that the slow-rise portion of the cam actu-
ates the switch. Then check continuity of the auxiliary
switch contacts R-B.
b. Non-spring return models: check continuity of the
auxiliary switch contacts R-B.
7. Rotate the cam as follows:
a. If the contacts are open, rotate the cam counter-
clockwise until the R-B contacts close.
b. If the contacts are closed, rotate the cam clockwise
until the R-B contacts open.
8. Check for proper auxiliary equipment differential and
switching by driving the motor though the full stroke in
both directions.
9. Disconnect the potentiometer, reconnect the controller,
and replace the motor top cover.
NOTE: Changing the differential from 1° to 10° reverses
the switching action. For example, with a 10° dif-
ferential, switch contacts R-B make and R-W
break on a counterclockwise (closed) rotation.
With a 1° differential, switch contacts R-W make
and R-B break on a counterclockwise (closed)
rotation.
OPERATION
Use Series 90 Modutrol IV Motors for standard Series 90
operation (See Table 12):
1. Two potentiometers, one in the controller and one in the
motor, along with the motor resistor network, form a
bridge circuit. As long as the value of the controlled
medium remains at the setpoint, the circuit remains bal-
anced and the motor does not run.
2. When the controlled medium value changes, the control-
ler potentiometer wiper moves, unbalancing the bridge
circuit.
3. The imbalance is amplified and the microcontroller then
drives the motor in the direction necessary to correct the
controlled medium change.
4. As the motor shaft rotates, it turns the feedback potenti-
ometer, rebalancing the bridge circuit, stopping the
motor.
Table 12. Modutrol IV Motor Operation.
Motor Type
Non-Spring Return
Open W and short
or Spring Return
R to B
Open B and short
R to W
Jumper R-W-B
None
Non-Spring Return Power Loss
Spring Return
Power Loss
Fig. 12. Attaching a Shunt Resistor to TRADELINE Motors.
Table 13. Cam Arrangements.
Motor
M9174B1027
M9174C1025
M9174C1033
M917C1041
All Other M91XX
11
SERIES 90 MODUTROL IV
Signal
Resulting Action
drives open
drives closed
drives to midstroke
drives closed
stops (none)
spring returns
(closed)
Inner
Cam
Blue
Blue
Blue
Blue
Blue
™
MOTORS
M17626
Outer
Cam
Blue
Blue
Blue
Blue
Red
63-2631—07
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