Emerson VSG & VSSG Troubleshooting Guide download pdf (Page 53)

VSG/VSSG • Compact Logix PLC Manual •Vilter/Emerson • 35391CL

Calibration Procedure of Optical Actuators

Press down on the photochopper shaft to disen-

gage the brake, releasing tension from the motor

mount. Use the INC button to pulse the actuator

to where the slide is just off of the mechanical

stop and there is no tension on the motor shaft.

10. Quickly press and release the blue button on the

actuator again. The red LED will now flash at a

slower rate, indication that the minimum slide

valve position (zero position) has been set.

11. Use the INC button on the Control Panel panel

to drive the slide to its maximum “mechanical

stop” position. Do not continue to run the ac-

tuator in this direction after the slide valve has

reached the stop. Doing so may cause dam-

age to the actuator or the slide valve. Press

down on the photochopper shaft to disengage

the brake, releasing tension from the motor

mount. Use the DEC button to pulse the actua-

tor to where the slide is just off of its mechanical

stop and there is no tension on the motor shaft.

12. Quickly press and release the blue button on the

actuator one more time. The red LED will stop

flashing. The actuator is now calibrated and

knows the minimum and maximum positions

of the slide valve it controls. Now the capacity

or volume channel of the PLC can be calibrated.

13. Use the DEC button to move the actuator to-

wards its minimum position while watching the

millivolt readout on the Control Panel screen.

Discontinue pressing the DEC button when the

millivolt reading the “Current” window above

the “Set Min” button is approximately 500 mil-

livolts.

14. Now use the DEC and INC buttons to posi-

tion the slide valve until a value close to 300

millivolts is on the screen. Then, press the

“Set Min” button in the capacity or volume

slide valve window to tell the controller that

this is the minimum millivolt position. Note:

The value in the “Current Cap” or “Current

Vol” window has no meaning right now.

Do not touch wires, may cause an

electrical shock!

8. Note: The “Slide calibration” screen on the Con-

trol Panel has a “Current” window, which displays

twice the actuator output voltage. This value,

(the % volume and the % capacity) displayed in

the “Current Vol” and Current Cap” Windows are

meaningless until calibration has been completed.

9. Use the DEC button on the Control panel to drive

the slide valve to its minimum “mechanical stop”

position. Do not continue to run the actuator in

this direction after the slide valve has reached

the stop. Doing so may cause damage to the

actuator or the slide valve.

Remove Cover

Press Down On

Phot ochopper

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Emerson VSG & VSSG Troubleshooting Guide Page 53

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