Coulter Electrode Functions; Testing Cable And Wiring Continuity - Veris U3 Operating Instructions Manual

Coulter Electrode Functions-

Each coulter electrode on the implement is part of a pair, and each pair has a distinct function.
a) Coulters 2 & 3 are the 0-2' receptors.
b) Coulters 1 & 4 are the "charged" coulters that inject the voltage into the soil. If you are getting no
(or intermittent) readings -- continuity to one of these two coulter-electrodes is likely the cause.
If the continuity ohm test indicates a problem on a channel, you will need to determine where the
interruption is located. Listed below are detailed instructions on how to determine exactly where a
continuity or isolation problem is located:
A. Testing Cable and Wiring continuity:
1. Once a high resistance reading on a channel is confirmed, determine whether the problem is in the
wiring or in the coulter-electrode. To test all cable and wiring, place one ohmmeter lead in the Test
Box terminal pin for that channel and the other on the corresponding coulter wire terminal bolt.
Grasp connector and move back and forth during this test – vibration from rough fields can weaken
the contacts, causing intermittent breaks in continuity during operation that might not show up in a
static test. Repeat process on all coulter-electrodes.
2. If you see <2 ohms on all, test the coulter electrodes as explained in B below.
3. If you see a > 2ohms reading on any channel, separate weather pack connector and insert one
ohmmeter lead in the end of wiring harness and the other lead in the corresponding terminal on the
Test Box. If reading is < 2 ohms at that point, the problem is not with the wiring harness or signal
cable extension. It is most likely in the terminal connector wire. Check resistance in it by placing
one ohmmeter lead on the coulter wire terminal bolt and the other lead in the end of the terminal
wire socket. Replace connector wire (PN 14226) as necessary.
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Pub# OM20-U3-pH