25
ESP-LXIVM Controller Troubleshooting Guide
Short Circuit
If there is a short circuit (can be caused by crossed red and black wires)
in the 2-wire path, the controller Alarm light will be illuminated and the
alarm will inform you the controller has switched to Short Finding Mode.
You must fix the short circuit before the controller will switch back to
normal irrigation mode.
2-Wire Path Diagnostics
1.
Disconnect each 2-wire path cable one at a time from the
controller IVM 2-Wire Interface Module until the controller exits
Short Finding Mode. Reconnect that 2-wire path cable, and if
the Short Finding Mode returns you know the short is on that
leg of the 2-Wire path.
2.
Refer to the as-built to see the location of the 2-wire path. Walk
the route of the 2-wire path cable and check for signs of recent
construction/digging.
3.
Find a device location about half-way down the 2-wire path
cable. Disconnect the splices. See if the controller is still in
Short Finding Mode. If the Short Finding Mode has cleared, the
problem is downstream of this location. If the controller is still
in Short Finding Mode, the problem is between this location
and the controller. Keep disconnecting segments of the 2-wire
path until you isolate the problem.
4.
Use a Clamp Meter to measure the Amp Draw of the 2-wire
path cable conductors at the last working device and the first
non-working device. Note any discrepancy in the readings. You
must know the number and type of each device downstream to
know what the mA reading up should be reading (see the Total
System Milliamp Draw section for more information).
5.
The problem may be caused by a device that was damaged by
a lightning power surge. The controller will exit Short Finding
Mode when the damaged device is disconnected from the
2-wire path.