Near Intersection of I-35 & I-90 Southern Mn. | OK, since the Vol/min is zero, your problem lies with the "flow" side of things. Something is wrong with the 440, the wiring or the flow meter itself.
Here's how the wiring should go. The flow meter cable consists of three wires. One wire is signal ground from the 440, it is the braided outer portion of the cable. A braided outer shield like this is used to provide ground and also shied the inner wires from electrical interference. Inside the braided CoAx are two other wires. One should be 5V which is coming from the circuit board in the Raven 440 and goes out to provide 5V power to the circuitry in the flow meter sensor. The third wire is the actual signal wire coming out of the flow meter sensor and eventually leads to the 440. This signal wire is "pulled up" to 5 V by a "Pullup Resistor" but can be temporarily shorted to ground by the circuitry in the flow meter. The spinning turbine within the flow meter has magnets on it which trigger a Hall effect device that briefly shorts the signal line to ground
Mechanically this would be quite similar to the old baler counter. The arm on the bale counter is normally UP since it is connected to a spring but the arm on the knotter can temporarily push the lever down to register a bale, once the knotter arm has passed the spring pulls the arm back UP in preparation for the next bale. Without the spring, the bale counter might work sometimes but sometimes not. This is the same situation with the flow meter. Raven has a pull-up in the 440 and also in the flow meter. Sort of like a spring on both ends.
This is why the Raven "paper clip" test is suggested. By temporarily shorting the signal wire to ground and then releasing it you have created a pulse (tripped the bale counter). With a meter cal of 1, this will register a gallon in the total volume. providing all the switches are ON. Actually with a meter cal of one, you get many counts since your have created several grounds and the system is fast and catches them even though you don't realize it.
If you use a meter you can check the status of these wires by observing the voltage between them. If the connector at the hitch is the single 16 single pin AMP connector, Put the back probe of the meter on Pin 11, then put the red probe on Pin 12. The meter should show 5V, this shows that the 5V supply from the 440 internal voltage regulator is present at that point at least. This is the Power/Ground pair that the flow meter circuitry lives on. Next leave the black probe in Pin 11 and put the red probe in Pin 13. Pin 13 is the signal line which should also be at 5V if the pullup in the 440 is working properly.
If you do not get those reading there, the problem is forward, either in the display cable or the 440 itself. If you do get those readings, then the problem is rearward, either in the implement cable or the flow meter itself. Notice I'm suggesting the old troubleshooting technique again of splitting the problem in two parts.
If the meter readings are not correct at the hitch disconnect point, then the problem is forward either with the display cable of the 440 itself. Since the display cable is fairly new, the problem would seem to be within the 440 itself. It may need repair.
One other thing, although it is not as important as it used to be, Raven still suggests that the large red and white wires for the display cable go directly to the battery. This is insure that the intercanal voltage regulator is getting a good healthy supply of 12 Volts. If you are not connected directly to the battery or even if you are, I would check over those connections.
Good luck.
Edited by tedbear 4/19/2024 07:32
|
Raven console cable pinout - no voltage to flowmeter TEDBEAR!
