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©2013 Technical Marine Service, Inc. LC-100 V2.97
be externally powered the analog output circuit is electrically isolated from the rest of the
LevelCom 100. If the analog output does not work check the following:
Check the connections to the Analog Output terminals. Make sure the correct connector is
wired, and verify the polarity of the wiring. It may be that something is wired backwards in
the loop. Refer to the wiring diagrams in the installation section of the manual.
Check the jumpers on the sensor board and make sure that the analog output is configured
as self-powered or isolated. Refer to Figure 16 and Figure 15 for the proper jumper settings.
If the jumpers are in the wrong position, the output will not work.
If your machine has the LC100-A2 or –A3 sensor input circuit board, the analog output is
contained in a small circuit board attached to the sensor input board. There is an LED on the
analog output board next to the ZERO potentiometer that flashes to indicate that the board is
functioning. Refer to Figure 24 for location of this LED. If this LED is not flashing the analog
output module has probably failed, and should be replaced.
Digital Repeater Communication Troubleshooting
The Digital communication output is based on an RS-485 physical interface. It uses the
connector for the Analog Output to connect its signal wiring. If you are experiencing trouble
communicating with LevelCom 101 Repeaters using the digital communication option, check
the following.
There is an LED on the LC101-DC1 Digital Communication Interface board, mounted on the
sensor input board inside the LevelCom 100. If the interface board is functioning correctly,
this LED will flash. If this LED is not flashing the board may have a problem. A second
check for this is to enter the configuration menus and see if the DIGITAL COMMUNICATION
option is available under the OUTPUTS menu. The communication interface is automatically
detected when the LevelCom 100 is powered up. If the interface is not working, you will find
the ANALOG OUTPUT option under the OUTPUTS menu rather than the DIGITAL
COMMUNICATION option. In this case the communication interface board will have to be
replaced.
Check to see that the jumpers on the sensor board are set up correctly, see Figure 16 and
Figure 15. The jumpers need to be set as shown for Externally Powered Loop.
Make sure that the polarity of the wires in the connector is correct. You could try swapping
the polarity to see if things work.
If the jumpers are set correctly make sure all ID numbers are set up correctly on both the
LevelCom 100 and the LevelCom 101 Repeaters. If these check out, and if they were just
configured try cycling power to all machines. To check these configurations refer to page 62.
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