TLA100 User’s Manual
Page 10
Revision 1.2
Symptom
Troubleshooting Procedure
No tank level
output
1. If operating in the
NMEA 2000
®
Mode
, check the connections to the
NMEA 2000
®
interface (see Section 2.3.2) and/or the connection to the
resistive tank sender (see Section 2.3.1.2) and tighten if necessary.
2. If operating in the
NMEA 2000
®
/ Analog Gauge Mode
, then check the
connections to the NMEA 2000
®
interface (see Section 2.3.2) and/or
the connection to the analog gauge (see Section 2.3.1.1) and tighten if
necessary.
3. 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.
4. 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. Remember, the accuracy of most analog gauges/resistive tank
senders is at best plus or minus 10%. The inaccuracies are due to
both the analog gauge and the resistive tank senders. Although the
TLA100 is a precision instrument, it is only as good as the resistive
sender, which may not be as accurate as you like. Avoid low cost
resistive tank senders if you desire good accuracy.
2. If using a standard resistive tank sender (American standard 240-30
ohm, European standard 10-180 ohms), make sure you have correctly
configured the TLA100 for the appropriate standard (see Section
3.5.1).
3. If using a standard resistive tank sender (i.e., American or European),
you may want to consider custom calibration (see Section 3.5.2). The
standard sensor values assume that your tank is empty when the float
is bottomed out (i.e., one end of the resistive range) and that the tank
is full when the float is all the way up (i.e., the other end of the resistive
range), which may not be the case if, for example, the tank drain is
above the bottom of the tank. Custom calibration will use actual
minimum and maximum resistive values instead of assuming that the
tank is full and empty at the standard resistive extremes.
4. If using custom calibration, re-calibrate the TLA100 (see Section
3.5.2).
5. If operating in the
NMEA 2000
®
/ Analog Gauge Mode
, ensure correct
analog gauge resistive values have been configured or programmed
into the TLA100 (see Section 3.3.1)
Figure 5 – Troubleshooting Guide
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