Yetter AIR ADJUST 2940 Operator's Manual page 40

2940 Air Adjust Cab Controller Operation
Main Menu: This screen will allow you to navigate to the setup and service screens. Selecting EXIT will return you to the
main operating screen.
Setup: Currently this screen has one option, to select & edit the Dump Valve Delay.
- Dump Valve Delay: This screen allows you to adjust the dump valve delay time. Press the ENTER button to go into the edit
mode & then adjust the time with the SCROLL UP/DOWN buttons. The time value will have .25 second resolution & will be
adjustable from 0-60 seconds. Pressing ENTER again will exit the edit mode. Generally, no more than 2.5 seconds is
needed. (see page 44 for proper setting)
- Setting the Dump Valve Delay:

Ensure all dump valves & harnesses are plugged in securely & that dump valves are functioning properly

Adjustments will be made in increments of .25 seconds.

When the dump valve delay is properly set, the residue managers should react as follows: with sufficient tank pressure, AIR
ON displayed, command RU to 30psi, RD to 35psi, & WT to 37psi. Press the Roman numeral I button & all residue managers
will raise. Press the Roman numeral I button again & all residue managers should drop to half travel & then settle into
position. If the residue managers don't go to half travel, more dump valve delay is needed. If the residue managers go further
than half travel, less dump valve delay is needed. It is best to have a second person looking as well.

Access the dump valve delay screen on your cab controller.

Adjust the dump valve delay by .25 seconds at a time in the desired direction (more or less), revert to home screen.

Press the Roman numeral I button & observe residue managers to see if more adjustment is needed.

Keep adjusting as needed
SEE PAGE 44 TO SEE WHAT SETTING THE DUMP VALVE DELAY SHOULD BE FOR YOUR SITUATION
Service: This screen has (3) selections to choose from, HOUR METERS, MAINTENANCE, and FAULT STATUS.
- Hour Meters: This screen will contain (2) hour meters, air compressor hours, which only increments if the compressor is on,
& total system hours, which only increments if the air system is enabled (AIR ON). There will also be a field that shows duty
cycle; this is a cumulative value calculated by dividing compressor hours by system hours which equals the percentage of
time the compressor has run in reference to how many hours the system has been enabled. The percentage shown by the
duty cycle should be less than 20%. If not, perform the leak check. (See pages 44)
- Maintenance: This screen is static & has a text description indicating basic maintenance info.
- Fault Status: J1: This screen contains real time read outs of command & feedback voltage readings for each pin present in
the connector labeled J1.
- Fault Status: J2: This screen contains real time read outs of command & feedback voltage readings for each pin present in
the connector labeled J2
- Fault Status: J3: This screen contains real time read outs of command & feedback voltage readings for each pin present in
the connector labeled J3
- Fault Status: J4: This screen contains real time read outs of command & feedback voltage readings for each pin present in
the connector labeled J4
Warning – Compressor Run Time: This screen will be displayed if the compressor has been running continuously for 15
minutes. Evaluate the system for leaks or other issues before continuing. When all issues are fixed, press ENTER to
clear the screen & resume normal operation.
Warning – Check Fault Screens: If a fault is detected, this screen will be displayed. Contact a service representative at
Yetter, & have the fault screens ready, to review voltage readouts for diagnostics. This warning will remain displayed until the
ENTER button is pressed.
Air System On: The state of this displayed text tells the operator if the system is operating or not. The Air System will be ON
if the ENTER button is pressed on the main operating screen (screen 1). At this point the indicator will turn from red to green.
It will maintain ON until ENTER is pressed again, turning the indicator back to its original color. Remember to switch the air
system off, before removing power to the controller. The system is ON when the indicator is green; also the text on the
screen will read "AIR ON" (vs. "AIR OFF").
Compressor Sump Dump: This dumps any water that has built up in the compressor tank or water separator. This function
is programmed to open the valve for 5 seconds every hour to dump the moisture. The Compressor Sump Dump valve can
also be activated by holding the "Scroll Down" button while on the Main Operating Screen for 8 seconds. The valve will
remain open as long as the button is pressed, releasing the button will close the valve.
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