Honeywell Series 90 Auxiliary Switch Adjustment, Modutrol IV Motor Operation, Motor Type

SERIES 90 MODUTROL IV™ MOTORS

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.

Motor Type	Signal	Resulting Action
Non-Spring Return	Open W and short	drives open
or Spring Return	R to B
	Open B and short	drives closed
	R to W
	Jumper R-W-B	drives to midstroke
	None	stops (none)
Non-Spring Return	Power Loss
Spring Return	Power Loss	spring returns
		(closed)

T1

T2 R

B

W

M17626

Fig. 10. Attaching a shunt resistor to TRADELINE motors.

Table 7. Cam Arrangements.

Motor	Inner	Outer
	Cam	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

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