Electronics International MVP-50T, Installation Instructions Manual

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7.11 Annunciator Problem:
An Annunciator, displayed on the MVP screen, is monitored with a temperature or resistive fuel level channel on the
EDC. The voltage into a temperature channel must be limited to 2.5 volts. When measuring voltages above +2.5 volts
a VI-221 Module should be used in series with the temperature channel to drop the voltage to an acceptable level. The
voltage into a resistive fuel level channel should be limited to 18 volts.
An Annunciator will be one color for a low voltage and another color a high voltage. The colors are set in the “4.
Redlines, Limits and Color Setup” screen. Note: The color white will be displayed as black or off. You can also set the
trip level at which the Annunciator changes color. The trip level is displayed in sensor counts so you will need to get a
sensor count reading with the Annunciator on and then off. Set the trip level between the on and off value.
A. Symptom: The Annunciator is not changing colors.
1. Problem: Mis-wired.
a) Action: Check that the voltage on the appropriate EDC pin changes from high to low and back to
high as the Annunciator is cycled.
2. Problem: The MVP is set up incorrectly.
a) Action:
Check the "Start" and "End" setting in the “4. Redlines, Limits and Color Setup” screen.
Check the probe selected in the “1. EDC Input to Function Mapping” screen is "Volts 0-2.5."
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