American Dryer Corp MLG-460 manual Possible Solutions

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.

59