Spirax Sarco AEL7 Series - Potentiometer; Installation of Potentiometer (1 - 6 kN)

IM-P713-01 CTLS Issue 1
32
AEL7 Series Electric actuator
5.3 Potentiometer
The potentiometer is used to provide a 0-10Vdc feedback of actuator (valve) position for VMD actuators and
to provide the internal position feedback for actuators fitted with a positioner card. For position feedback for
actuators fitted with a positioner card see Section 6.4.
For 1 – 6 kN actuators, the potentiometer operates via use of the same fixed feedback bar coupled directly
to the driving rod of main actuator spindle that is used to operate the auxiliary travel switches and therefore
requires the auxiliary switch transmitter plate to be installed in order to mount the potentiometer. For 8 – 20
kN actuators, the potentiometer operates via use of an adjustable stroke arm coupled directly to the driving
rod of main actuator spindle.
Caution
Before commencement of any work to inspect, install, commission, remove or modify the
apotentiometer, please read to Section 1 "Safety Information" and Section 4.1 "Electrical
Connection Safety Considerations".
5.3.1 Installation of Potentiometer (1 - 6 kN)
With the actuator spindle in the fully extended position, the power supply safely isolated and the actuator
cover removed:
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Check the potentiometer kit for compatibility, completeness and signs of damage. Reject any damaged
parts immediately
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Refer to Fig. 11 Potentiometer Installation and Adjustment (1 – 6 kN) for product orientation
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Remove circlip and pinion from the potentiometer
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Remove the lock nut and washer from the potentiometer
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Slide the potentiometer and spacer ring through the transmitter plate
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Loosely replace the washer and lock nut
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Slide the pinion onto the potentiometer shaft, taking care to ensure that the mesh with the stroke pinion
is correct
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Tighten the lock nut
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Connect the wiring harness to the potentiometer socket as detailed in Fig. 11 Potentiometer Installation
and Adjustment (1-6 kN)
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Using an insulated terminal screwdriver, carefully turn the potentiometer fully clockwise in order to zero
the device (confirm with a measurement instrument if necessary)