Teledyne 700 IR Series Instruction Manual page 37

Stability Fault – AutoSpan
If the detector fails the signal stability criteria during AutoSpan sequence (Section 0) the "Stability
Fault" will be declared. A "Stability Fault" will cause a "Fault Detected" message to scroll once a
minute on the display and drop the milliamp output to 0mA. The Modbus™ fault register bit for
Stability Fault will be set and will not clear until the fault condition has been cleared. The detector
should be considered as "Out-of-Service" until a successful AutoSpan calibration is performed.
Clearing Fault – AutoSpan
If the detector fails the signal stability criteria during AutoSpan sequence (Section 0) the "Clearing
Fault" will be declared. A "Clearing Fault" will cause a "Fault Detected" message to scroll once
a minute on the display and drop the milliamp output to 0mA. The Modbus™ fault register bit for
Clearing Fault will be set and will not clear until the fault condition has been cleared. The detector
should be considered as "Out-of-Service" until a successful AutoSpan calibration is performed.
Sensor Fault
If the plug-in IR sensor, or the supporting electronics, fails to meet the required minimum or
maximum working signal parameters a "Sensor Fault" will be declared. A "Sensor Fault" will
cause a "Fault Detected" message to scroll once a minute on the display. The Modbus™ fault
register bit for Sensor Fault will be set and will not clear until the fault condition has been cleared.
If a Sensor Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.
Processor Fault
If the detector has any unrecoverable run-time errors, a "Processor Fault" is declared. A
"Processor Fault" will cause a "Fault Detected" message to scroll once a minute on the display.
The Modbus™ fault register bit for Processor Fault will be set and will not clear until the fault
condition has been cleared. If a Processor Fault occurs, the 4-20mA signal will be set at 0mA
until the fault condition is resolved.
Memory Fault
If the detector has a failure in saving new data to memory, a "Memory Fault" is declared. A
"Memory Fault" will cause the "Fault Detected" message to scroll once a minute on the display.
The Modbus™ fault register bit for Memory Fault will be set and will not clear until the fault
condition has been cleared. If a Memory Fault occurs, the 4-20mA signal will be set at 0mA until
the fault condition is resolved.
4-20mA Loop Fault
If the detector detects a condition where the 4-20mA output loop is not functional (high loop
resistance or failed circuit function) a "4-20mA Fault" is declared. A "4-20mA Fault" will cause
the "Fault Detected" message to scroll once a minute on the display. The Modbus™ fault register
bit for Loop Fault will be set and will not clear until the fault condition has been cleared. If a Loop
Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.
NP700IRIMEN
Revision E.0
INFRARED GAS DETECTOR FOR COMBUSTIBLE AND CO
700 IR Series
2
GASES
USER MANUAL
31