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3a) Malfunctioning operator interface terminal or communications cable.
4a) Malfunctioning 24 volt DC power supply.
5a) Malfunctioning hi-limit temperature controller.
b. POSSIBLE SOLUTIONS;
1b) Verify that fuses 7, 8, 9, and 10 are good.
Check that ALL fuse holder L.E.D. (light emitting diode) indicators are not lit.
• If ALL fuses are good, go to paragraph #2b below, paragraph #3b below, paragraph #4b
below, or paragraph #5b below and on page 60.
• If a fuse is bad, check the corresponding circuit, replace the fuse and test.
2b) Malfunctioning PLC (Programmable Logic Controller).
• If PLC power is off, a “LINE FAULT MESSAGE” will be displayed on the operator interface
terminal.
NOTE: Call the ADC Service Department at (508) 678-9000.
3b) Malfunctioning operator interface terminal.
• Check power supply voltage to the operator interface terminal. It should be 24 volts DC.
• Check that the interface cable to both the PLC and the operator interface terminal are secure.
NOTE: Call the ADC Service Department at (508) 678-9000.
4b) Malfunctioning 24 volt DC power supply.
• Verify that the power supply’s red “ON” light is illuminated.
• Verify that 110 volt AC supply is available and correct.
• Verify that the 4-40 mA (4-40 milliampere) transmitters or operator interface terminal are not
causing the power supply to fail.
• If the previous checked items are “OK,” replace the power supply.
5b) Malfunctioning hi-limit temperature controllers (HLS1 or HLS2).
• HLS1 - exhaust temperature hi-limit
• HLS2 - intake temperature hi-limit
HLS1 and HLS2 are monitored by a six (6) channel hi-limit temperature controller that once
triggered must be manually reset.