Flowserve LY Series Limitorque - Manual (Page 25)

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11
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4. Retighten the Screw (piece #147) on the MDPI Dial Plate (piece #146).
Figure 5.12 – Aligning MDPI with Dial Window Retaining Plate
5.10.1 Setting the Potentiometer
If the LY actuator includes a Feedback Potentiometer used for remote valve position indication, use an
ohmmeter to calibrate the position of the potentiometer.
c WARNING: HAZARDOUS VOLTAGE. Turn power off before calibrating the Feedback
Potentiometer.
1. Using the Handwheel, position the actuator to mid-travel (valve at the 50% position).
2. Disconnect the Potentiometer Wiring Harness from where it is plugged in or connected to a
Terminal Strip.
3. Using an ohmmeter, verify that the potentiometer is in mid-travel. The resistance from each End
Connection to the Center Connection should be half of the full resistance of the Potentiometer.
Example: 1000 ohm potentiometer should read approximately 500 ohms from one of the End
Connections to the Center Connection.
Limitorque
PERCENT OPEN
0 50 100
L i m
i t o
r q
u e
#108 MDPI Retaining
Plate arrow
#146 MDPI Dial Plate
#147 Screw