Honeywell Modutrol IV Motors Series 90 - Manual (Page 10)

SERIES 90 MODUTROL IV™ MOTORS
63-2190—3 10
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. 7.
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
auxiliary 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
counterclockwise 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
actuates 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
counterclockwise 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° differential,
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 6):
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
balanced and the motor does not run.
2. When the controlled medium value changes, the
controller potentiometer wiper moves, unbalancing the
bridge circuit.
3. The imbalance is amplified and energizes switching to
drive the motor in the direction necessary to correct the
controlled medium change.
4. As the motor shaft rotates, it turns the feedback
potentiometer, rebalancing the bridge circuit, stopping
the motor.
Table 6. Modutrol IV Motor Operation.
Fig. 10. Attaching a shunt resistor to TRADELINE motors.
Table 7. Cam Arrangements.
Motor Type Signal Resulting Action
Non-Spring Return
or Spring Return
Open W and short
R to B
drives open
Open B and short
R to W
drives closed
Jumper R-W-B drives to midstroke
None stops (none)
Non-Spring Return Power Loss
Spring Return
Power Loss spring returns
(closed)
Motor
Inner
Cam
Outer
Cam
M9164D1009, M9174D1007 Red Blue
M9175D1014
M9172W1004
Red Red
ALL OTHER M9164, M9172, M9175 Blue Red
M9161, M9171
M9184, M9194
M9185, M9186
M9484, M9494
ALL OTHER M9174
Blue Blue
T1
T2
R
B
W
M17626