OLCT 700/710 TP
OLCT 700/710 TP Instruction Manual
Rev. C.1
Page 25 of 45
Stability Fault - AutoSpan
If the sensor fails the signal stability criteria during AutoSpan sequence (Section 3.4), 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 mA 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 OLCT 700/710 should be considered as “Out-
of-Service” until a successful AutoSpan calibration is performed.
Clearing Fault - AutoSpan
If the sensor fails the signal stability criteria during AutoSpan sequence (Section 3.4), 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 mA 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 OLCT 700/710 should be considered as “Out-
of-Service” until a successful AutoSpan calibration is performed.
Open Heater Fault
If the sensor heater should fail and become electrically open, a “Heater Fault” will be declared. A “Heater
Fault” will cause a “Fault Detected” message to scroll once a minute on the display. The Modbus™ fault
register bit for Heater Fault will be set and will not clear until the fault condition has been cleared. If a
Heater Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.
Open Sensor Fault
If the sensor film should fail and become electrically open, a “Sensor Fault” is 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 OLCT 700/710 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 OLCT 700/710 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 OLCT700/710 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.
NOTE: If the 4-20mA output is not being used, the Green wire from the detector must be
connected to the Black wire at the (-) terminal on the Transient Protection Module to
ensure RS-485 communication is not disrupted by a 4-20mA Fault.
Input Voltage Fault
If the OLCT 700/710 is currently receiving an input voltage that is outside of the 11.5-28VDC range, an
“Input Voltage Fault” is declared. An “Input Voltage Fault” will cause the “Fault Detected” message to
scroll once a minute on the display. The fault register bit for Input Voltage Fault will be set and will not
clear until the fault condition has been cleared. If an Input Voltage Fault occurs, the 4-20mA signal will be
set at 0mA until the fault condition is resolved.
Содержание 700 TP Series
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