CRANE
CO.
280
N.
MIDLAND
AVE.,
STE
258,
SADDLE
BROOK,
NJ
07663
WWW.AVIDCONTROLS.COM
12/17/12
TECH-440/D.W.O. 23135
Page 43 of 55
Appendix D
Procedure to Check Transducer Operation
This procedure should only be used for trouble shooting
This procedure requires a 4-20mA current generator.
1. Mount the positioner and connect the pneumatics as described in section 3 of this manual.
2. Remove the cable that connects the inner canister to the pneumatic transducer assembly.
The electronic canister does not need to be removed.
3. Locate Pin 2 & Pin 4 on transducer pin connector (see figure below).
a.
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 current generator to Pin 2 and negative lead to Pin 4.
a.
Note:
make sure power on the current generator is turned off before connecting it
to the pins. Make sure the two leads are not shorting by both coming in contact
with Pin 3.
5. Turn the 4-20 mA generator on.
a.
Note:
the transducer operates between 0 and 3.3 mA. Therefore, make sure when
turning on the current generator the current is turned down within this range.
Applying a current greater than 3.3 mA can permanently damage the transducer.
6. Apply enough air supply 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 fully open and fully close the actuator. You should also be able
to control the position of the actuator by slowly 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)
