Service and troubleshooting
EST3 Installation and Service Manual 8.71
Table 8-40: Addressable analog diagnostic table interpretation
Table Name Description Possible causes
Device Type
Fault
The wrong device type for the
current configuration.
Photo detector installed for ion detector
Ion detector installed for photo detector
Monitor module installed for control
module
Control module installed for monitor
module
Two device addresses are transposed.
Unexpected
Fault
A device is reporting at an
unconfigured address.
All unconfigured addresses
are polled at startup and at
10-minute intervals thereafter.
If the total number of Communicating
Devices is correct, and a Communication
Fault is reported, the Unexpected Fault
device should be set to the address listed
as a Communication fault.
Duplicate Device
Fault
Two or more devices have
the same address.
If the total number of Communicating
Devices shown in the table is correct, a
device has been assigned the same
address as a configured device.
If the total number of Communicating
Devices is too low, and a Communication
Fault is reported, the device in the
Communication fault table is addressed at
the location shown in the Duplicate Device
table.
Communication
Fault
Missing device. Wiring error or device not installed
If Communicating Devices table short by
one and Duplicate Device fault exists, then
address shown in Comm Fault table is
addressed at location shown in Duplicate
Device table.
OR
If Communicating Devices table OK and
Unexpected Fault exists, then the
Unexpected Fault device should be set to
the address shown in the Communication
Fault table.
Open Fault Module field wiring is open. Circuit incorrectly wired or connector loose
Defective detector or isolator base
Broken conductor
Device not installed on circuit
Device not entered into SDU databases
Short Fault Module field wiring is shorted. Circuit incorrectly wired
Defective detector, detector base, or
module
Nicked insulation between conductors
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