Detcon FP-624D - Manual (Page 28)

Model FP-624D
FP-624D Instruction Manual Rev. 1.2 Page 24 of 42
sensors that are operated on a common fixed bridge voltage platform. The range of bridge voltages required
for Detcon sensors is generally between 2.5 – 2.9VDC.
NOTE: The “Set Bridge Voltage” function is executed during factory calibration of every FP-
624D sensor. In the field, this menu item is only needed when a replacement plug-in sensor is
being installed, when mating a new FP-624D transmitter with an existing plug-in sensor or
when remote mounting the sensor away from the transmitter.
The menu item appears as: “Set Bridge Voltage”.
From the Set Bridge Voltage text scroll, hold the magnet over PGM1 or PGM2 until the “▼” prompt appears
and continue to hold the magnet in place for an additional 7-8 seconds (until the display starts to scroll
“Setting Bridge”). The transmitter will then display “WAIT”. During the 1-minute sequence, the transmitter
will display the three-digit number that corresponds to the bridge current as it is being adjusted.
At
conclusion, the display will scroll “Set Bridge Voltage”. The new bridge voltage can be viewed in the “View
Sensor Status” menu.
Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Set Bridge Voltage” 4 times and then return to Normal
Operation).
3.5.6 Signal Output Check
Signal Output Check provides a simulated 4-20mA and Modbus output. This simulation allows the user to
conveniently perform a functional system check of their entire safety system. This signal output simulation
also aids the user in performing troubleshooting of signal wiring problems.
The menu item appears as: “Signal Output Check”.
From the “Signal Output Check” text scroll, hold the magnet over PGM1 or PGM2 until the “▼” prompt
appears and then hold continuously for an additional 10 seconds.
Once initiated, the display will scroll
“Simulation Active” until the function is stopped. During simulation mode, the 4-20mA value will be
increased from 4.0mA to 20.0mA (in 1% of range increments at about a 1 second update rate) and then
decreased from 20.0mA to 4.0mA. The value of the Modbus concentration register (40002) will also be
increased and decreased in the same manner.
NOTE: Signal Output Check stays active indefinitely until the user stops the function. There
is no automatic timeout for this feature.
To end simulation mode, hold magnet over PGM1 or PGM2 for 3 seconds. The display will either move to the
prior menu item or move to the next menu item respectively.
Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds.
3.5.7 Restore Factory Defaults
Restore Factory Defaults is used to clear current user configuration and calibration data from memory and
revert to factory default values. This may be required if the settings have been configured improperly and a
known reference point needs to be re-established to correct the problem.
This menu item appears as: “Restore Defaults”.