Flowserve StarPac 3 - Manual (Page 41)

41
StarPac Intelligent Control System FCD VLENIM0066-05 04/14
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6. Remove the two rotary position sensor-retaining screws and lift the sensor out of the housing.
7. Turn the new position sensor shaft until the dot on the side of the shaft is aligned with the wires on the side
of the position sensor (Figure 20).
Figure 20: Stem Position Sensor Orientation
8. Insert the position sensor into the shaft with the wires pointing toward the main PCB assembly. Turn the
position sensor clock-wise until bolting slots align with the housing screw holes and the wires on the sensor
protrude over the main PCB assembly.
9. Carefully center the position sensor on the shaft bore, insert and tighten the screws. Do not over-tighten.
10. Route the wires along the side of the position sensor and reconnect to the main PCB assembly.
11. Re-install the main PCB assembly following the instructions found in section 14.15 of this manual.
12. Re-install the keypad. Insert the two retaining screws and tighten evenly, using a Phillips a screwdriver. Do
not over-tighten.
13. Reinstall all covers.
14. Reconnect power and air supply to the positioner and perform a stroke calibration.
14.15 Main PCB Assembly Replacement
The main printed circuit board (PCB) assembly contains the circuit board and processor that perform control functions
of the positioner. The main PCB is to be replaced as a unit. None of the components on the main PCB are serviceable.
To replace the main PCB assembly, refer to Figure 20 and proceed as outlined below. The main PCB assembly consists of three
boards. The top board will have to be separated from the assembly. The bottom two boards will not have to be separated and will
remain together.
Housing
Stem
Position
Sensor
Feedback
Shaft
Bearing
Stem Position
Sensor Dot
Sensor
Cable