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ESP-LXIVM Controller Troubleshooting Guide
B
NOTE: A majority of field wiring issues are caused by poor wire
splices. Use only WC20 Splice Kits. All splices should be made in
splice boxes.
B
NOTE: If the 2-wire path is Looped, disconnect the loop half way
out before troubleshooting.
Broken Wire (Open Circuit) List Not Responding
If there is a broken wire causing an open circuit in the 2-wire path, you
will notice one or more stations are not running even though they are
programmed to operate. If the system is using flow sensing, you will
receive a low (zero) flow alarm for each disconnected 2-wire station.
Controller Diagnostics
1.
Turn the dial to Test All Stations / Check System. Select 2-Wire
Diagnostics.
2.
Select the List Not Responding. The results will indicate that
one or more devices have an open circuit and you will be
prompted to Check Wiring. Go to the location of the 2-wire
devices that are not responding and check all wire splices.
2-Wire Path Diagnostics
1.
Note the “List Not Responding” displays and corresponding
wire paths.
If you notice that all the 2-wire devices that are not
responding are in a single leg of the 2-wire path, the open
circuit exists between the last working 2-wire device and
the first non-working 2-wire device. Check the splices at that
location first. Also look for signs of recent construction/digging
between the working and non-working 2-wire devices.
B
NOTE: If 2-Wire mapping is not done, the wire path column will
not include any information.
2.
Turn the controller dial to 2-Wire Diagnostics; Select Short
Finding; Turn Short Finding Mode On. 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 discrepancies 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).