Honeywell Series 90 Benutzerhandbuch

63-2190—3

10

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.

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.

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)

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