Flowserve Position Transmitter User Manual

P osition Transmitter Calibration Instructions

For use with non-UEC controls only; to use with UEC-3 controllers, please see bulletin 440-12000, UEC-3 Operation Manual

Feedback potentiometer 1K ohms

4mA Adjust 20mA Adjust

Power ON indicator

4-20mA +VE

4-20mA -VE

4-20mA Output

-VE

LK2 and LK3 jumpers. For actuator equipped with UEC-3 or UEC-3-MPC 24VDC input, move jumpers to “DC” position. For actuators equipped with 18VAC input, move jumpers to “AC” position.

+VE

Power Supply:

24VDC 4 OVDC 6

18VAC 4 OVAC 6

6 4 2 1

Specification

Output signal

• 4-20mA

Input potentiometer

• 1K (ohms)

Temperature rating

• -40 to +85°C

Linearity error

• ±1% max.

Loop resistance

• 370 (ohms) max.

Power

• 18 VAC or 24 VDC ± 10% (LK2 and LK3 must be set appropriately)

Important note

Analog inputs must not be connected to earth ground on +VE or -VE terminal.

Calibration procedure

1. Position the actuator to mid-travel (valve at 50% Position).

2. Disconnect the potentiometer wiring harness from the PT20SD board and measure the resistance from each End connection to the center connection on the potentiometer.

3. To set the potentiometer to the correct resistance r eading, loosen the setscrew that retains the spur gear on the potentiometer shaft and rotate the shaft until a reading of 500(ohms) is acheived.

4. Tighten the setscrew and reconnect the wiring harness to the PT20SD.

5. Run the actuator fully CLOSED.

6. Calibrate ZERO position by adjusting the zero potentiometer until a 4mA output signal is read at terminals +VE and -VE.

7. Run the actuator fully OPEN.

8. Calibrate SPAN position by adjusting the span potentiometer until a 20mA output signal is read at terminals +VE and -VE.

9. Repeat steps 5 to 8 and fine-tune as necessary.

PT20SD

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