Maretron FPM100 - Manual (Page 18)

FPM100 User’s Manual
Page 14 Revision 1.3
5 Troubleshooting
If you notice unexpected operation of the Maretron FPM100, follow the troubleshooting
procedures in this section to remedy simple problems.
Symptom Troubleshooting Procedure
No Pressure
data visible on
NMEA 2000
®
network.
1. Ensure that the FPM100 is properly connected to the NMEA 2000
®
network.
2. Ensure that pressure transducers are properly connected to the
FPM100.
3. Ensure that each channel that you wish to monitor is configured as
“Pressure/Vacuum”and that instance numbers are configured
correctly.
4. Ensure that the FPM100 has the appropriate NMEA 2000 PGNs
enabled.
Inaccurate
pressure output 1. Ensure that the “Pressure at 4mA” and “Pressure at 20mA”
configuration items are set to appropriate values for the pressure
transducer.
2. Check that the vent tube from the pressure transducer (only present
on some transducers) is not kinked or blocked.
3. Remove the pressure transducer from the tank opening and ensure
that the pressure port on the transducer is not clogged.
No Tank Level
data visible on
NMEA 2000
®
network.
1. If operating in the NMEA 2000
®
Mode, check the connection to the
NMEA 2000
®
interface (see Section 2.5.1) and tighten if necessary.
2. Ensure that power is supplied to the NMEA 2000
®
network. Proper
network power can be checked by measuring the voltage at an open
tee between NET-S and NET-C. The voltage should be between 9 and
16 volts.
3. Ensure that both trunk line terminators are in place. Proper network
termination can be checked by removing network power and
measuring the resistance at an open tee between NET-L and NET-H
signals. The resistance should read approximately 60 ohms (two 120
ohm terminators in parallel equals 60 ohms).
Inaccurate tank
level output 1. If operating with a rectangular tank, ensure that the tank depth is
programmed properly (see Section Error! Reference source not
found.).
2. If using custom calibration, re-calibrate the FPM100 (see Section
3.3.5.2).
3. Check that the vent tube from the pressure transducer is not kinked or
blocked.
4. Remove the pressure transducer from the tank opening and ensure
that the pressure port on the transducer is not clogged.
Zero pressure
readings when
pressurized 1. Ensure that the “Pressure at 4mA” and “Pressure at 20mA”
configuration items are set to appropriate values for the pressure
transducer.
2. Check the cable connection to the pressure transducer to see whether
a wire has become loose, or the cable has been cut.