23 ESP-LXIVM Controller Troubleshooting Guide
Table of
Contents
Field Wiring Diagnostics
The ESP-LXIVM Controller includes multiple diagnostic functions to help
you determine the cause of a field wiring issue.
Tools and Equipment
• An accurate “as-built” showing wire path and 2-wire device locations,
the number and type of the 2-wire devices on each wire path, and
2-wire addresses
• Filled out LX-IVM Controller Programming Guide with 2-wire
addresses and station/MV/sensor assignments
• A Volt/Ohm Meter (multi-meter) capable of reading 0 to 50 volts AC/
DC and resistance from 0 to 1,000,000 Ohms
• A Clamp Meter for measuring AC current with a precision of 1.0 mA
(milliamp)
• Wire tracing and fault finding equipment
• Spare system components and tools including: spare IVM-SOL, IVM-
SEN device, WC20 Splice Kits and wire strippers
Total System Milliamp Draw
Before troubleshooting a field wiring issue, calculate the expected total
system draw in milliamp (mA). This value can be compared to actual
readings during troubleshooting.
• Each IVM-SOL, IVM-OUT draws 0.67mA
• IVM-SEN draws 6 mA
• Add up the total devices of each type for each wire path and
calculate the wire path mA draw
• Add the mA for each wire path together for the total system mA
draw
Field Wiring Issues
Field wiring issues are typically caused by a broken wire, a short circuit or a
ground fault in the 2-wire path. Refer to the section that best describes the
observed symptoms to troubleshoot.
• Broken Wire (Open Circuit)
• Short Circuit
• Ground Fault
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