Specifications

10/31/02 Tech-304/DWO 14195 Page 32 of 39
Appendix C
Procedure to Check Transducer Operation
(This procedure should only be used for trouble shooting)
1. Mount the positioner and connect the pneumatics as described in section 3 of this man-
ual.
2. Remove the Display Board as described in Appendix B of this manual. The electronic can-
ister does not need to be removed.
3. Locate Pin 2 & Pin 4 on transducer pin connector. (See Figure Below)
Ref.: Pin 1 is furthest from the pressure gages, Pin 10 is nearest to the to the pressure
gages.
4. Connect positive lead of the signal generator to Pin 2 and connect negative lead to Pin 4.
Note: Make sure power on the signal generator is turned off before connecting it to the
pins.
Note: Make sure the two leads are not shorting by both coming in contact with Pin 3.
5. Turn on the 4-20 mA signal generator.
Note: The transducer operates between 0 and 3.3 mA. Therefore, make sure when turn-
ing on the current supply’s power the current is turned down within this range. Applying a
current greater then 3.3 mA can damage the transducer.
6. Apply the supply air to the positioner.
7. The transducer consists of a spool that will channel air between the two output ports of the
positioner. As the current is raised air is removed from Output Port 2 and applied to Out-
put Port 1 of the positioner.
8. To check the operation of the positioner, raise and lower the current between 0 and 4 mA.
This should allow you to open and close the actuator. You should also be able to control
the position of the actuator by adjusting the current supply at an intermediary (idle) current
somewhere between 0 and 3.3 mA.
To Pin 2
(Red +)
To Pin 4
(Black -)
4-20 mA
Signal
Generator
(Do Not Exceed
3.3 mA)
*