EST EST3X - Page 238

Chapter 7: Service and troubleshooting
228 EST3X Technical Reference Manual
Trouble Table c
olumn Description Possible causes
Unexpected Fault
The device is reporting at an
unconfigured address
If the total number of communicating
devices equals those installed and a
communications fault is reported, the
unexpected fault
device should be set to
the address listed in the
Communications Fault column
Communication
Fault
The device is missing • There is a wiring error or the device
is not installed
•
If the total number of communicating
devices is
one less then the number
of installed devices and a duplicate
fault exists, the address shown in
the Communications Fault column is
addressed at the location shown in
Duplicate Fault column
•
If the total number of communicating
devices equals those installed and
an unexpected fault exists, the
unexpected fault device should be
set to the address shown in the
Communications Fault column
Open Fault
An open is detected in the
field wiring
• The loop is incorrectly wired or the
connector is loose
• The detector or isolator base is
defective
• The conductor is broken
• The device is not installed on the
loop
• The device is not defined in the
3-SDU
Ground Fault
The device has a ground fault There is a ground fault on the field
wiring side of the device
Sho
rt Fault A short is detected in the field
wiring
• The loop is incorrectly wired
• The detector, detector base, or
module is defective
• The insulation is nicked between
conductors
Compatibility Fault
An incorrect device type is
installed
Incompatible devices are intermixed on
the loop
Dirty Head
The detector needs cleaned The detector is dirty
Maint Alert
Perform device maintenance The device requires maintenance