Flowserve APEX 5000 Analog Feedback Options - Manual (Page 3)

B00063-0 (AUTO-71) 4/00 Page: 3 of 4
© 2000, Flowserve Corporation, Provo, UT
Automax Valve Automation Systems
Installation, Operation and Maintenance Instructions
4. Loosen (do not remove) potentiometer module
mounting screws (2). Push potentiometer away from
positioner shaft and turn to yield desired resistance.
5. Engage potentiometer gear and tighten mounting
screws.
6. Change positioner input signal to rotate
actuator/valve to end position. Check that resistance
increases (or decreases) over stroke and that poten-
tiometer does not rotate past maximum (or mini-
mum) resistance.
7. Replace cover.
4-20 mA Current Transmitter:
Figure 3 shows a diagram of the controller board and all
necessary current loop components for calibration.
1. The controller board action DIP switch selects direc-
tion. For 4 mA in the full clockwise direction, select
“D”. For 4 mA in the full counterclockwise direction,
select “R”. The factory setting is “D”.
Note: When adjusting factory or previously installed
transmitters, steps 2 through 4 should not be necessary.
2. Change positioner input signal to rotate actuator/
valve to mid position (45 degrees or 50%).
3. Loosen transmitter module mounting screws (2).
Push potentiometer away from positioner shaft and
turn to yield 12 mA.
4. Engage potentiometer gear and tighten mounting
screws.
5. Change positioner input signal to rotate
actuator/valve to fail or start position.
6. Adjust controller board zero trim pot. to yield 4 mA.
7. Change positioner input signal to rotate actuator/
valve to end position.
8. Adjust controller board span trim pot. to yield 20 mA.
9. The zero and span adjustments are interactive.
Repeat steps 5 through 8 until further zero adjust-
ment does not affect span and vice versa.
10. Disconnect test equipment (if necessary), and replace
cover.
Note: If transmitter adjustment gets difficult (i.e. trim pots
do not have desired effect) start over by “centering” the
trim pots. This is accomplished by turning in one direc-
tion 20 turns or until a clicking sound is heard. Turn in
the opposite direction 10 turns. Repeat for other trim pot.
Start calibration over at step 2.
Figure 3 – 4-20 mA Transmitter Diagram