Flowserve SMB Series Electric Actuators - Manual (Page 27)

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SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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4.6 Position Indication
4.6.1 Local Position Indicator
NOTE: The local dial position indicator displays valve position. The position indicator can only be
adjusted when the actuator is mounted on the valve. See Figures 7.1-7.3 (SMB-000), 7.4-7.8 (SMB-
00), 7.9-7.12 (SMB-0 through 4), 7.13-7.16 (SMB-5).
To set the position indicator:
1. Disconnect all incoming power and open or remove the Limit Switch Compartment Cover.
2. Place the valve in the fully “close” position.
3. Loosen the round head machine screw that holds the pointer in place, move the pointer to the
“C” position, and retighten the screw.
The indicator is now set.
4.6.2 Remote Position Indicator
(50 ohm or 1000 ohm Potentiometer)
The SMB or SB actuator with a potentiometer installed, transmits a 0-10 VDC output signal to a
remote position indicator (meter). The potentiometer is powered by 120 VAC.
To set the potentiometer:
NOTE: The pinion has been disengaged to prevent damaging the potentiometer prior to setting the
valve.
1. Set the potentiometer by turning the pinion until the desired reading is obtained.
2. Loosen the hex nut on the back of the potentiometer and slide the potentiometer in the direction
of the idler pinion until the pinions are engaged.
3. Do not force the engagement of the pinions.
4. Retighten the hex nut on the back of the potentiometer.
5. Do not engage the pinion until the actuator and valve positions have been set.
To calibrate the potentiometer:
1. Position the valve at 50% of full travel.
2. Read the resistance from the wiper to either end of the potentiometer.
3. To set the potentiometer to the proper value, loosen the set screw on the potentiometer shaft
pinion and rotate the potentiometer shaft to a reading of ~500 ohms for the 1000-ohm potenti-
ometer, or ~25 ohms for the 50-ohm potentiometer.
4. Tighten the set screw.
5. Run the actuator to the fully CLOSED position.
6. Adjust the CLOSED position setting to a value at or above 0 ohms.
7. Run the actuator to the fully OPEN position.