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APPLICATION
The R7195A,B Motor Positioner is a single channel solid state
proportioning amplifier that will accept an output signal from a
controller to position a reversing control motor with a 135-ohm
or 1000-ohm feedback slidewire. Motors with slidewires that
have resistances other than 135 ohms or 1000 ohms will be
shunted to one of these two values.
The R7195A Motor Positioner is factory-adjusted to accept a 4
to 20 mA input. The R7195B Motor Positioner is
factory-adjusted to accept input from a 135-ohm
retransmitting slidewire.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
Motor Positioner
FEATURES
• Accepts 4-20 mA or 135-ohm signal to provide position
proportional control of M944 Modutrol® Motor without
balance relay and M940A,B Actionator.
• Heavy duty case.
• Mounts directly on M940 Actuator.
• Solid state design extends product life and reliability.
• Zero, span and deadband adjustments allow motor to
be field adjusted to various input ranges: i.e., split
ranging.
• Hard Manual feature allows operator to override the
controller (4-20 mA or 135-ohm input) action to open or
close fully the final control element.
• Reversing direction of motor can be accomplished by
simple wiring change of R7195.
• Output from one R7355 4-20 mA DialaTrol can operate
up to eight R7195 Positioners and associated M944 or
M940 Actuators.
• Output from one 135-ohm Series 90 Controller can
operate up to five R7195B Motor Positioners.
• Span and zero adjustment do not interact with each
other so each adjustment can be made independently
without having to readjust the other parameter.
• Can operate with motor feedback slidewire between
100 and 1000 ohms.
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Installation ........................................................................
Wiring ...............................................................................
Operation ..........................................................................
Service and Troubleshooting ............................................
R7195A,B
PRODUCT DATA
Contents
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Summary of Contents for Honeywell R7195A
- Page 1 • Output from one 135-ohm Series 90 Controller can operate up to five R7195B Motor Positioners. The R7195A,B Motor Positioner is a single channel solid state proportioning amplifier that will accept an output signal from a • Span and zero adjustment do not interact with each...
- Page 2 Honeywell, 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
- Page 3 (198) 6-9/16 (167) 3/4 (14) NPSM (2) M20786 Fig. 1. R7195A,B Motor Positioner approximate dimensions in in. (mm). INSTALLATION Procedure Refer to Fig. 1 and layout of the centers of the mounting hole locations on the mounting surface. When Installing this Product…...
- Page 4 Split Range Capability Wiring Motor Positioner to Motor Terminals See Fig. 2 and 3. Two R7195A Motor positioners can be wired to operate in series or can be used to split the range. One 1. Refer to wiring diagrams and documentation supplied...
- Page 5 R7195A,B MOTOR POSITIONER R7195A,B MOTOR POSITIONER GROUND R7195 NEUTRAL SUPPLY – TERMINALS TO 4-20 mA INPUT 135-OHM POTENTIOMETER INPUT M940A MOTOR M20790 Fig. 5. Connections to M940 Motor using common supply voltage. R7195A,B MOTOR POSITIONER GROUND R7195 NEUTRAL SUPPLY M944 G, S –...
- Page 6 R7195A,B MOTOR POSITIONER R7195A,B MOTOR POSITIONER GROUND R7195 NEUTRAL SUPPLY 120 VAC 24 VAC – 135-OHM M944B, E TERMINALS TO MODUTROL POTENTIOMETER 4-20 mA INPUT MOTORS INPUT M20792 Fig. 7. Connections to M944B,E Modutrol® Motors. OPERATION The controller output signal is transmitted to the balancing bridge portion of the motor positioner.
- Page 7 Q4 will fire to drive the motor to the open NOTE: The R7195 Motor Positioner is calibrated at the position. 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...
- Page 8 R7195A,B MOTOR POSITIONER a. Frequent re-positioning (hunting) of the motor. a. Shorted triac switches Q3 and Q4. b. Oscillation of the process variable around the b. Q3 and Q4 break over at less than rated voltage. setpoint. c. Q3 and Q4 do not fire.
- Page 9 R7195A,B MOTOR POSITIONER TRIAC OUTPUT CIRCUIT IS OKAY. REPLACE OR TROUBLESHOOT PRINTED WIRING BOARD USING SCHEMATICS. DID MOTOR DRIVE AT NORMAL SPEED? SHORT TERMINALS B TO W. REPLACE Q4. DID MOTOR DRIVE OPEN? REPLACE Q4. DID MOTOR DRIVE AT MEASURE...
- Page 10 R7195A,B MOTOR POSITIONER TRIAC OUTPUT CIRCUIT IS OKAY. REPLACE OR TROUBLESHOOT PRINTED WIRING BOARD USING SCHEMATICS. DID MOTOR DRIVE AT NORMAL SPEED? OPEN INPUT W. REPLACE Q4. DID MOTOR DRIVE OPEN? REPLACE Q4. DID MOTOR DRIVE AT MEASURE IS VOLTAGE...
- Page 11 63-2582...
- Page 12 R7195A,B MOTOR POSITIONER By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification to, the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries, from and against any liability, cost, or damages, including attorneys’...