Emerson VSG & VSSG Specifications download pdf (Page 78)

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Section 6 • Instrument Calibration

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

Figure 6-6. Slide Calibration Screen (Not in Calibration Mode)

The slide calibration screen allows the user to calibrate

slide valve actuators.

Slide Calibration Overview:

• Must be logged in as “SUPER” to calibrate slides.

• Press “Enter Slide Calibration” To Activate Slide

Calibration Mode, see Figure 6-7. (Machine MUST be

stopped to enter slide calibration mode. Machine will

not be allowed to start if slide calibration is active.)

• Use up/down pushbuttons to move slide actuators.

• Table in slide calibration screen indicates the correct

rotation of the slide valve command shaft.

• Enter minimum and maximum raw values in numeri-

cal entry ﬁ elds.

Slide Calibration Screen

Both the capacity and volume slide actuators should be

calibrated when one or more of these have occurred:

• Compressor unit starting up for the ﬁ rst time.

• A new actuator motor has been installed.

• There is an error code ﬂ ashing on the actuator’s

circuit board - an attempt to recalibrate should be

made.

• The range of travel is not correct and the command

shaft travel is physically correct.

• The compressor is pulling high amperage, the cali-

bration of the volume slide should be checked.

• An actuator does not unload below 5%, or an actua-

tor that doesn’t move.

• Something is not working properly such as the actua-

tors, RTDs or transducers.

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Emerson VSG & VSSG Specifications Page 78