Detcon FP-700 User Manual
Page 30
Model FP-700
FP-700 Instruction Manual
Rev. 3.0
Page 26 of 40
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 RS-485 communication is not disrupted by a 4-20mA Fault.
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.