Emerson VSG & VSSG Specifications download pdf (Page 81)

6 – 9

Section 6 • Instrument Calibration

Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM

Figure 6-9. Photo-chopper

Press down on Photo-

chopper to release tension

from motor shaft.

16. Quickly press and release the blue button on the

actuator one more time. The red LED will stop

ﬂ ashing. The actuator is now calibrated and knows

the minimum and maximum positions of the slide

valve it controls. Now the capacity or volume chan-

nel of the PLC can be calibrated.

17. Use the down arrow button to move the actuator

towards its minimum position while watching the

mV readout on the screen. Discontinue pressing

the down arrow button when the mV reading is ap-

proximately 500 mV.

18. Now use the down arrow and up arrow buttons to

position the slide valve until a value close to 300 mV

is achieved. Then, press the “Set Min” button in the

capacity or volume slide valve window to tell the

controller that this is the minimum mV position.

19. Use the up arrow button to rotate the actuator to-

wards its maximum position while watching the

mV readout on the controller screen. Discontinue

pressing the up arrow button when the mV reading

of approximately 4800 mV is achieved.

20. Pulse the up arrow button to carefully move the

slide valve until the mV readout “saturates”, or

stops increasing. This is around 4800 mV Record

mV maximum reading.

21. Pulse the down arrow button until the mV just start

to decrease. (This is the point where the channel

drops out of saturation). Adjust mV value to 300

mV below recorded maximum mV.

22. Press the “Set Max” button.

23. Press the “Calibration Main” button to complete

calibration and exit the “Slide Calibration” screen.

The controller will automatically energize the ac-

tuator and drive it back to its minimum position

(below 5%) for pre-start-up.

NOTE

Now the current ‘Capacity” or the current ‘Volume”

value will be displayed on the Main screen and Slide

Calibration screen.

24. Gently lower the plastic cover over the top of the

actuator to where it contacts the base and O-ring

seal.

CAUTION

Do not over tigten screws. Failure to comply may

result in damage to equipment.

25. Check and make sure the cover is seated properly,

then gently tighten the four #10 screws.

26. Repeat procedure to calibrate other slide valve

actuator.

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Emerson VSG & VSSG Specifications Page 81

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