Model FP-700
FP-700 Instruction Manual
Rev. 5.1
Page 29 of 46
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 ITM 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 ITM 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 sensor 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 ITM 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. If the 4-20mA current loop is still out of tolerance, contact Detcon at
, or contact Detcon customer service.
NOTE: If the 4-20mA output is not being used, the Green wire from the sensor must be
connected to the Black wire at the (-) terminal on the Transient Protection Module to
ensure proper sensor operation.
Input Voltage Fault
If the detector 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 ITM 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.
Temperature Fault
If the detector is currently reporting an ambient temperature that is outside of the –40C to +75C range a
“Temperature Fault” is declared. A “Temperature Fault” will cause the “Fault Detected” message to scroll once
a minute on the ITM display. The Modbus™ fault register bit for Temperature Fault will be set and will not
clear until the fault condition has been cleared. If a Temperature Fault occurs, the 4-20mA signal remains
operational.
AutoSpan Reminder Fault
If 180 days has elapsed since the last successful AutoSpan, an AutoSpan Fault will be generated. An “AutoSpan
Fault” will cause the “Fault Detected” message to scroll once a minute on the ITM display. The Modbus™ fault
register bit for AutoSpan Reminder Fault will be set and will not clear until the fault condition has been cleared.
If an AutoSpan Reminder Fault occurs, the 4-20mA signal remains operational.
