Flowserve CENTURA Analog Output Options Calibration User Manual

Automax Valve Automation Systems

3-Position Control/Dribble Control

Installation, Operation and Maintenance Instructions

Flowserve Corporation 765 South 100 East Phone: [phone]
Flow Control Division Provo, Utah 84606 Facsimile: 801 489 2228

www.flowserve.com Email: [e-mail]

SR Limit Switch Method

CENTURA Analog Output Options Calibration and Operating Instructions

Electrical Specifications

Resistive feedback modules use a 1% linearity precision potentiometer operated by precision gears. The current feedback
option combines the potentiometer with a 4-20mA transmitter card.

4-20 mA Current Transmitter 0-1 K ohm resistive 0-5K ohm resistive 0-10 K ohm resistive
Voltage required: 6-30 Vdc 1 Watt max. Ioad 1 Watt max. Ioad 1 Watt max. Ioad
Input resistance: 750 ohms max Temp. range: 32 to Temp. range: 32 to Temp. range: 32 to

Temp. range: 32 to 158° F

NOTE: 1. Both resistive and current feedback signals are geared for quarter turn operation. Consult factory for other

2. The ‘TX’ option is a loop powered transmitter. For ‘TT’ options (transmitter with servo) see IOM for electronic

while circuits are alive. Disconnect supply circuit before opening.
Division 1 applications must be calibrated in a secured area.
Calibration

Resistive Feedback:

1. Remove cover and rotate actuator/valve to fail or start position.

2. Note desired resistance values at fail or start position.

3. Connect an ohmmeter to feedback terminals.

4. Using a 0.035 allen hex driver, loosen the set screw on the potentiometer gear. With a flat blade
screwdriver, rotate the end of the potentiometer shaft to yield desired resistance.

5. Alternatively, the jam nut holding the potentiometer to the bracket may be loosened. Slide the
potentiometer & gear away from the camshaft gear and rotate to desired resistance. Re-align and tighten.

6. Rotate actuator/valve to end position. Check that resistance increases (or decreases) over stroke and
that the potentiometer does not rotate passed maximum (or minimum) resistance.

7. Replace cover.

4-20 mA Current Transmitter:

Figure 1 shows a diagram of the transmitter board and all necessary current loop components for calibration.

1. The controller board action DIP switch selects direction. 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:

2. Rotate actuator/valve to mid position (45 degrees or 50%).

3. Using a 0.035 allen hex driver, loosen the set screw on the potentiometer gear. With a flat blade screwdriver, rotate the
end of the potentiometer shaft to yield desired resistance.

4. Alternatively, the jam nut holding the potentiometer to the bracket may be loosened. Slide the potentiometer and gear
away from the camshaft gear and rotate to desired resistance. Re-align and tighten.

5. Rotate actuator/valve to fail or start position.

6. Adjust controller board zero trim pot. to yield 4 mA.

7. 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 adjustment does not affect
span and vice versa.

10. Disconnect test equipment (if necessary), and replace cover.
Note: If

pots. This is accomplished by turning in one direction
turns. Repeat for other trim pot. Start calibration over at step

TYPE TX TYPE P2 TYPE P3 TYPE P4

@24 Vdc 158° F 158° F 158° F

rotations.
servo position.

Caution: To Prevent ignition of hazardous atmospheres, keep unit tight

Steps 2 through 4

transmitter adjustment gets difficult (i.e. trim pots do not have desired effect) start over by “centering” the trim

are

normally not necessary.

20

turns or until a clicking is heard. Turn in the opposite direction 10

2.

LME0011-1 (AUTO-68) 12/00

©

2000, Flowserve Corporation, Provo, Utah

Page 1 of 2

Automax Valve Automation Systems

3-Position Control/Dribble Control

Installation, Operation and Maintenance Instructions

Flowserve Corporation 765 South 100 East Phone: [phone]
Flow Control Division Provo, Utah 84606 Facsimile: 801 489 2228

www.flowserve.com Email: [e-mail]

SR Limit Switch Method

Figure 1 – 4-20 mA Transmitter Diagram

Troubleshooting

Output is not continuous throughout actuator/valve stroke
(experience a band of max. output)

Transmitter does not out 4 or 20 mA at desired end of
travel.

Transmitter module does not provide current signal or
provide constant signal.

Output not linear or does not track valve position/rotation

Problem

Probable Cause/Solution

Potentiometer is out of adjustment (see “Resistive
Feedback Calibration” or 4-20mA Current Transmitter
Calibration” steps 2-4).

Zero or span trim potentiometer is out of adjustment (see
4-20mA Current Transmitter Calibration).

Circuit Board LED not lit:

1. Loose or shorted signal connection (no loop power).

2. Controller board not responding (replace board)
Circuit Board LED lit:

1. Potentiometer disengaged.

2. Defective potentiometer or controller board. Replace
defective component.

Input signal not linear. Linkage or drive mechanism is
introducing non-linearity. Zero span trim potentiometer is
out of adjustment (see 4-20mA Current Transmitter
Calibration).

LME0011-1 (AUTO-68) 12/00

©

2000, Flowserve Corporation, Provo, Utah

Page 2 of 2