Honeywell R7195A, Product Data

R7195A,B MOTOR POSITIONER

7

63-2582

Fig. 9. External wiring diagram.

Heating Application # 1:

When the temperature at the sensor is above the range of the 

controller, the controller output will be above the proportioning 

range of the controller. For example: the controller output 

signal will be less than 4 mA for a 4-20 mA range controller; 

motor positioner triac Q3 will fire to drive the motor to the 

closed position.

Heating Application # 2:

When the temperature at the sensor is below the range of the 

controller, the controller output will be below the proportioning 

range of the controller. For example: the controller output will 

be greater than 20 mA for a 4-20 mA range controller. Motor 

positioner triac Q4 will fire to drive the motor to the open 

position.

Heating Application # 3:

When the temperature at the sensor is within the 

proportioning range of the controller; Q3 triac will fire as the 

sensor temperature rises above the controller setpoint to drive 

the motor in the closed direction. Q4 triac will fire as the 

temperature at the sensor drops below the controller setpointt 

to drive the motor in the open direction.

In each case the motor will move until a new balance point is 

reached such that the error voltage between the input signal 

and the slidewire signal is zero.

SERVICE AND TROUBLESHOOTING

Calibration Procedure

NOTE: The R7195 Motor Positioner is calibrated at the 

factory for a 4-20 mA input signal for the R7195A 

and a 135-ohm potentiometer input for the R7195B. 

Therefore, do not calibrate the motor positioner 

unless the input signal desired is something other 

than 4-20 mA (R7195A) or 135 ohms (R7195B).

To calibrate the positioner, refer to Fig. 9.

For the span and zero adjustment check, do the following:

1.

Connect the input source (4-20 mA or 135-ohm 

potentiometer) to terminals R, B and W.

2.

Set the input to the minimum value of span. Adjust the 

zero potentiometer (P3) to balance out the motor and 

the minimum limit.

3.

Set the input to the maximum value of span. Adjust the 

span potentiometer (P1) to balance out the motor at the 

maximum limit.

Deadband Adjustment

The deadband adjustment (P2) will be set at the mid position 

to provide precise control of the process for most process 

applications. Some processes may require deadband 

adjustment to achieve stable control. Unstable process 

conditions may be characterized by:

(P1) SPAN ADJUST

(P2) DEADBAND ADJUST

(P3) ZERO ADJUST

M202794

GROUND

NEUTRAL

HOT

GROUND

R7195 SUPPLY

HOT

ROTOR SWITCH

CCW
CLOSE

CW
OPEN

MOTOR
WINDINGS

Q4

Q3

LIMIT
SWITCHES

NEUTRAL

G

GROUND

MOTOR
SUPPLY

COMMON

4-20 mA INPUT

MOTOR

B

W

R

CW

135-OHM

POTENTIOMETER INPUT

R7195A,B
MOTOR POSITIONER

5

4

6

G

L2

L1

2

3

1

B

W

R