Detcon FP-624D-HT - Manual (Page 34)

Model FP-624D-HT
FP-624D-HT Instruction Manual Rev. 1.1 Page 30 of 44
Sensor Voltage Fault
If the voltage across the sensor bridge (See Figure 3) is greater than 3.5VDC or less than 1.8VDC, a “Sensor
Voltage Fault” will be declared. A “Sensor Voltage Fault” will cause a “Fault Detected” message to scroll
once a minute on the transmitter display. If a Sensor Voltage Fault occurs, the 4-20mA signal will be set at
0mA and the “Sensor Voltage Fault” bit will be set 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 sensor display. If a Processor Fault
occurs, the 4-20mA signal will be set at 0mA and the “Processor Fault” bit will be set 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 sensor display. If a Memory Fault
occurs, the 4-20mA signal will be set at 0mA and the “Memory Fault” bit will be set until the fault condition is
resolved.
4-20mA Loop Fault
If the detector measures a 4-20mA loop load resistance > 1000 ohms, a “4-20mA Fault” is declared. A “4-
20mA Fault” will cause the “Fault Detected” message to scroll once a minute on the sensor display. If a Loop
Fault occurs, the 4-20mA signal will be set at 0mA and the “4-20mA Fault” bit will be set until the fault
condition is resolved.
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 sensor display. If an Input Voltage Fault occurs, the 4-20mA signal will be set at 0mA and the
“Input Voltage Fault” bit will be set until the fault condition is resolved.
Temperature Fault
If the detector is reporting currently an ambient temperature that is outside of the –40ºC to +75ºC range, a
“Temperature Fault” is declared. A “Temperature Fault” will cause the “Fault Detected” message to scroll
once a minute on the sensor display. If a Temperature Fault occurs, the 4-20mA signal remains operational,
but the ‘Temperature Fault” bit will be set.
AutoSpan 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 sensor display. If an
AutoSpan Reminder Fault, the 4-20mA signal remains operational, but the “Auto Span Fault” bit will be set.