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
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 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
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
21.Enable the “Slide
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
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 flow streams together down- stream of the oil temperature control valve. The valve can fully close (0%) diverting the entire oil flow 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%).
VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG | 4 – 7 |
