Page 82
©2013 Technical Marine Service, Inc. LC-100 V2.97
Pressing the appropriate button energizes the associated relay. This is useful for testing the
function of the relays and the condition of the relay contacts. It is a useful utility when wiring
to external alarm systems or control devices. The ESCAPE key is used to exit this utility.
The HORN item is used to test the installed Sonalert device in the LevelCom 100. It is useful
only if the horn option is installed. The ESCAPE key is used to exit this utility.
The DISPLAY item is used to test the entire display. When activated the character display
will show a rotating pattern that lights all segments in a digit including the decimal point. The
UP key will cause the bar graph to light starting from the bottom to the top. The DOWN key
will cause the bar graph lights to go out starting from the topmost lit segment down to the
bottom. The alarm setpoints will remain lit when they are in the dark part of the bar graph,
and they will be dark when they are in the lit part of the bar graph. The ESCAPE key is used
to exit this utility.
The BUTTONS item is used to test the front panel buttons. When active the display will
show the name of the last button pressed. This is useful if there is the possibility that one or
more of the buttons have failed. Simultaneously press the ENTER key and the ESCAPE key
to exit this utility.
If the machine has the analog output option installed there will be another utility available
called AN OUT. This is used for calibration and testing of the analog output. There are five
menu items in this utility. When the display shows ZERO, pressing ENTER forces the analog
output to 4 mA. When the display shows SPAN, pressing ENTER forces the analog output to
20 mA. These are intended for use in calibrating the analog output. These two functions are
used while adjusting the analog output span and zero pots found on the Sensor board in the
LevelCom 100. The 25%, 50%, and 75% items work the same way forcing the analog output
to 8 mA, 12 mA, and 16 mA respectively. They are useful for verifying the linearity of the
analog output, and are also useful for testing the field devices driven by the analog output.
Again it is the responsibility of the operator to use this utility in a safe manner. If the analog
output is used as a control output the controlled process must be secured before using this
utility.
If the LevelCom 100 is configured to communicate with LevelCom 101 digital repeaters there
will be a menu item available called DIGITAL COMMUNICATION. Under this item are a
number of utilities for troubleshooting the digital communication interface.
Finally the last item in this menu is the FIELD CAL procedure already described in the
calibration section on page 72.
Analog Output Troubleshooting
The analog output is a 4-20 mA output. The output may be run as a self-powered output (in
which case the LevelCom 100 provides power) or as an externally powered. When set up to
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