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Section 4 • Operation
3.
Carefully lift actuator cover from actuator assem-
bly and tilt towards Turck connectors. Raise cover
high enough to be able to press the blue calibration
button and be able to see the red LED on the top of
assembly.
4.
On the main screen of the PLC, press "Menu", then
"Instrument Calibration" button to enter the in-
strument calibration overview screen, then press
"Calibrate Slides" button to enter the slide calibra-
tion screen, see Figure 4-8.
5.
Logging on with high-level access will prompt the
"Enter Slide Calibration Mode" button to appear.
6.
Press "Enter Slide Calibration Mode" button to initi-
ate calibration mode. The Slide Calibration button
turns green and Set Max and Set Min buttons ap-
pear, see Figure 4-9.
7.
If the compressor unit is starting for the first time
or a new actuator was installed, connect connec-
tors of power cable and position transmitter cable
to new actuator.
If the UP (increase) and DOWN (decrease) buttons do
not correspond to increase (INC) or decrease (DEC)
shaft rotation, swap the blue and brown wires of the
"power cable" in the control panel. This will reverse the
rotation of the actuator/command shaft.
8.
Press UP or DOWN to move the slide valve and
check for the correct rotation, see Table 4-1.
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.
9.
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 photo-
chopper to release the brake, and thereby release the
tension on the actuator motor.
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
NOTE
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.
10. Use the DOWN button on the Control panel to drive
the slide valve to its minimum "mechanical stop"
position. Release the DOWN button when the slow-
ing of the motor rotation and a winding sound from
the actuator motor is noted.
11. Press down on the photo-chopper shaft to disen-
gage the brake, releasing tension from the motor
mount, see Figure 4-10. Use the UP button to pulse
the actuator to where the slide is just off of the me-
chanical stop and there is no tension on the motor
shaft.
12. 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.
13. Use the UP button on the Control panel to drive the
slide to its maximum "mechanical stop" position.
Release the UP button when the slowing of the mo-
tor rotation and a winding sound from the actuator
motor is noted.
14. Press down on the photo-chopper shaft to disen-
gage the brake, releasing tension from the motor
mount. Use the DOWN 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.
15. 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 chan-
nel of the PLC can be calibrated.
16. Use the DOWN button to move the actuator to-
wards its minimum position while watching the mV
readout on the Control Panel screen. Discontinue
pressing the DOWN button when the mV reading
the "Current" window above the "Set Min" button
is approximately 500 mV.
17. Now use the DOWN or UP buttons to position the
slide valve until a value close to 300 mV is on the
screen. Then, press the "Set Min" button in the ca-
pacity or volume slide valve window to tell the con-
troller that this is the minimum mV position. Note:
The value in the "Current Cap" or "Current Vol" win-
dow has no meaning right now.
NOTE
4 – 11
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Table of Contents
Troubleshooting
