30119-50 Rev. 2.2 | 23JUL2020
Page 37
TROUBLESHOOTING
7.0 TROUBLESHOOTING
Inaccurate Rate And Total Readings.
A. Check the gallons per revolution (GPR) and pulses per revolution (PPR) settings. The electronic register could be
programmed with incorrect GPR and PPR values.
B. Check that the input sensor cable’s shield wire is connected to the earth ground, per instructions on tag. Also, check the
connection of the shield wire on the outside instrumentation side of the output cable, per instructions on tag.
C. If there is known noisy process instrumentation close to the installation, such as variable frequency drives, use the
crimped green wire to connect any of the screws on the FlowCom’s canopy to a known good earth ground, such as a
copper rod inserted 4’ (four feet) into the ground.
No Optically-isolated Pulse Or Dry Contact Switch Output.
A. Verify that both the 4-20mA loop power and DC power to the optically-isolated pulse/dry contact switch are present and
connected to the correct output wires.
B. Check if the power source has the correct pulse voltage and current.
C. Make sure the ground wire inside the output cable is grounded on the instrument side.
D. Check whether a pull-up resistor is required to produce a signal.
No 4-20mA Transmitter Output.
A. Check that the negative side of the 24VDC (-24VDC) loop power supply is not connected to earth ground. To do this,
turn o the 24VDC power supply and use a standard ohm meter to verify that the -24VDC connection is not shorted to the
earth ground.
B. Check whether the 4-20mA loop is connected properly and powered.
C. Verify that the 20mA unit and full scale are set up in the program congurations.
Non-responsive Rate And Total Readings.
Check the connection between the sensor cable and the pulse input cable.
Blank LCD Display.
Check whether the 4-20mA loop is powered and/or the battery inside the canopy enclosure is installed properly.
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