Emerson VSG, VSSG manual 2. Actuator Assembly, Operation

Section 4 • Operation

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Actuator

Assembly

Actuator

Plastic Cover

Red LED

Blue

Calibrate

Button

Figure 4-2. Actuator Assembly

•There is an error code flashing 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.

To calibrate optical actuators, continue with the follow- ing steps:

1.Stop compressor unit and allow to cool.

2.Remove screws securing actuator cover to actuator assembly. As a reference see Figure 4-2.

CAUTION

Wires are attached to the connector on the actuator cover. Handle actuator cover with care to prevent damage to wires. Failure to comply may result in damage to equipment.

3.Carefully lift actuator cover from actuator assembly

and tilt towards Turck connectors. Raise cover high enough to be able to press the blue calibration but- ton and be able to see the red LED on the top of assembly.

4.On the main screen of the PLC, press “Menu” then press the “Slide Calibration” button to enter the slide calibration screen, see Figure 4-3.

5.Logging on with high-level access will prompt the Calibrate button to appear, see Figure 4-4.

6.Press Calibrate button to initiate calibration mode. The Calibrate button turns green and Set Max and Set Min buttons appear.

NOTE

If the INC (increase) and DEC (decrease) buttons do not correspond to increase or decrease shaft rotation, swap the blue and brown wires of the “power cable”. This will reverse the rotation of the actuator/command shaft.

7.Press INC and DEC to move the slide valve and check for the correct rotation, see Table 4-1.

NOTE

When the actuator is in calibration mode, it outputs 0V when the actuator is running and 5V when it is still. Thus, as stated earlier, the actuator voltage will fluctuate during calibration. After the actuator has been calibrated, 0V output will correspond to the minimum position and 5V to the maximum position.

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG 4 – 3