Emerson VSG 4. Slide Valve Calibration Screen Compact Logix PLC, 5. Photo-chopper, Operation

Section 4 • Operation

Figure 4-4. Slide Valve Calibration Screen (Compact Logix PLC)

8.Quickly press and release the blue push button on the actuator one time. This places the actuator in calibration mode. The red LED will begin flashing rapidly.

CAUTION

DO NOT CONTINUE TO ENERGIZE THE ACTUATOR MOTOR AFTER THE SLIDE HAS REACHED THE MECHANICAL STOP. Doing so may cause mechanical damage to the motor or shear the motor shaft key. When the slide has reached the mechanical stop position, press the button in the center of the photochopper to release the brake, and thereby

release the tension on the actuator motor.

NOTE

The “Slide calibration” screen on the Control 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. Press down on the photo-chopper shaft to disengage the brake, releasing tension from the motor mount, see Figure 4-5. Use the INC button

Press down on

Photo-chopper

Figure 4-5. Photo-chopper

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 ac- tuator again. The red LED will now flash at a slower rate, indication that the minimum slide valve posi- tion (zero position) has been set.

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG 4 – 5