Flowserve Position Transmitter - Manual

Position 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
or
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 reading, 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