Troubleshooting falls into three phases and the following three procedures explain how you should go about
locating the problem. Walking through each procedure in turn should ensure efficient troubleshooting.
Procedure 8.2. Phase I: Checking for Problems at the Controller
1. Measure the current at the point where the two-wire path is connected to the controller. Measure both
wires in the two-wire path separately, one at a time. Make a note of your readings as you'll use these
for comparison if you need to locate a faulty branch in the field.
• If one of the cables connected to the Ranger Converter 3000 loops back to the controller, you must
open the loop before measuring.
• If more than one non-looped cable is connected to the Ranger Converter 3000, you can readily
determine which cable holds the short - it will be the one with the highest current reading. You can
easily disconnect the paths by using the line switch (see Section 3.1.7, “Connecting the Two-wire”
[14]).
• If more than one non-looped cable seem to hold a short, detach all of them and connect and fix one
cable at a time.
• If there is a significant difference between the reading on the two wires in a two-wire, the one wire
might have a leak to earth or to the chassis of the Ranger Converter 3000.
2. If all readings in the previous step seem OK, or maybe even a bit lower than expected, you could be
looking at an error in the controller itself. To find out if this is the case, detach all two-wire paths connected
to the controller and check the power and current reading: If it is around 32-35V and 0-3mA the controller
is OK - otherwise it is defective.
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