A: At start up: If NETB11 check for code 67
A: While running:
- Check that the WireRat® device is powered up (lights on modem illuminated solid) when the pivot is running in both directions
- Improve the grounding of pivot to code
- Check if the pivot has 11 wire at end tower and 10 wire at pad
- If the above solutions have not resolved the issue, call 800-961-9549 while the pivot is running, to have Net Irrigate's assistance in diagnosing the issue
A: At idle/intermittent:
- Check the cleanliness of the collector ring, Zimmatic pivots are prone to needing jumpers on the collector ring (Net Irrigate provides complimentary relays if required)
- Check that the WireRat® device is grounded well
- If NETB12WR, check the condition of the grounding block in the end tower junction block. If it's in poor condition, Use a self tapping screw and ground green wire to grounded metal in the pivot junction box. or replace grounding block
- If NETB11, check that the backplate has a solid connection to a grounded part of the pivot
- If NETB11, check to ensure that the screw that goes through the backplate is tight (bottom left corner)
- If NETB11, open up the unit and check that the fourth terminal is snug by wiggling the white wire. Also check for moisture in the unit, or if the lead to the circuit board is cracked
- Unhook the WireRat® device. Check the bond of neutral and ground at the end tower with an analog ohm meter. Use the same analog meter to check the ohms from the pad between neutral and ground at the x-2 on transformer. The meter should read < 100,000 ohms for NETTB11, and <50,000 for a NETB12WR. If the reading is different, try unhooking the rest of the 120 volt circuit, where span cable meets the terminal strip. While testing ohms from span cable white to ground. There could be three or four wires that hold down the needle. When / where this proves successful the Wire Rat will need to be tested from pad / first tower, by pulling the 120 volt circuit, white last. Test at first tower, if results from pad aren’t satisfactory. Find trouble on pivot. Check for loose neutral / grounds along the way.
A: Weather related: Lightning in the area of a poorly grounded pivot can cause false alarms.