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VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG
Section 4 • Operation
11. Use the INC button on the Control panel to drive
the slide to its maximum “mechanical stop” posi-
tion. Do not continue to run the actuator in this di-
rection 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. Use the DEC button to pulse the ac-
tuator 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
fl ashing. 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.
13. Use the DEC button to move the actuator towards
its minimum position while watching the mV
readout on the Control Panel screen. Discontinue
pressing the DEC button when the mV reading the
“Current” window above the “Set Min” button is
approximately 500 mV.
14. Now use the DEC and INC 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.
15. Use the INC button to rotate the actuator towards
its maximum position while watching the mV read-
out on the controller screen. Discontinue press-
ing the INC button when the mV reading in the
“Current” window is approximately 4800 mV. You
are nearing the mechanical stop position.
16. Pulse the INC button to carefully move the slide
valve until the mV readout “saturates”, or stops in-
creasing. This is around 4800 mV Record mV maxi-
mum reading.
17. Pulse the DEC button until the mV just start to de-
crease. (This is the point where the channel drops
out of saturation). Adjust mV value to 300 mV be-
low recorded maximum mV.
18. Press the “Set Max” button.
19. Press the “Main” button to complete calibration
and exit the “Slide Calibration” screen. The con-
troller will automatically energize the actuator and
drive it back to its minimum position (below 5%) for
pre-start-up.
NOTE
Now the “Current Cap” or the “Current Vol” value will
be displayed in the window on the “Main” screen and
the “Slide Calibration” screen.
20. Gently lower the plastic cover over the top of the
actuator to where it contacts the base and O-ring
seal. After making sure the cover is seated prop-
erly, gently tighten the four #10 screws. Caution:
The plastic cover will crack if the screws are over
tightened.
21. Enable the “Slide Non-Movement Alarm” by going
to the “Setup” menu and choosing “Alarm Enable”
for the “Slide Non-Movement Option”.
22. Repeat procedure to calibrate other slide valve
actuator.
Oil Temperature Control Valve (Oil
Mixing Valve) Operation
Initial Position
The temperature control valve is in the closed position
when initially installed.
With the temperature control valve de-energized, the
valve is set to its initial position. The temperature con-
trol valve will be in the closed position with the actuator
indicator displaying CLOSED.
When the temperature control valve is energized, the
valve will rotate to fully OPEN.
Operation
With the compressor not running, when electrically en-
ergized, the PLC will turn the temperature control valve
to fully open (100%).
When the compressor starts, the valve remains fully
open (100%) until the oil injection temperature rises
above the control setpoint. When the oil injection tem-
perature rises above the control setpoint, the oil temper-
ature control valve will begin to close. The hot oil from
the oil separator begins to divert to the oil cooler, mix-
ing the hot and cooled oil fl ow streams together down-
stream of the oil temperature control valve. The valve
can fully close (0%) diverting the entire oil fl ow stream
to the oil cooler.
As the oil injection temperature drops below the set-
point, the oil temperature control valve begins to open
so that the oil injection temperature does not become
too cold.
When the compressor stops, the valve returns to fully
open (100%).