Appendix D - 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 manual.
2. Remove the electronics cover as described in Appendix B of this manual. The electronic canister
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 gauges, pin 10 is nearest to the pressure gauges.
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 turning 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 output 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)
page 31
AVID SmartCal valve positioner
Installation & operating instructions
