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Programmable Logic Controller (PLC)
Incorrect Liquid Asphalt Temperature Display

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 Problem Cause Solution/Reference Control push buttons fail Output card failure Output relay failure Motor starts but stops when start button released Control relay failed Auxiliary contact failed Control power fuse blown Batcher gates not operating Batcher not selected AUTO Batcher open/close times not set Low air pressure Burner controlled by logic controller Temperature too high in baghouse 4-4-6.  Blending Controller WARNING Dangerous  voltages  are  present  in  some  of  the  circuits.    Extreme  caution  should be  used  in  making  requested  readings.    Only  qualified  personnel  should  attempt repair of equipment thought to be defective. No Display on the Monitor 1. Verify the connecting cable integrity. 2. Check that the display power-on indicator is lit. 3. If it is lit, replace the monitor. 4. If still no display on the new monitor, replace the CRT card in the blending controller rack. 5. If no audible beep when the power is turned on, measure the system logic DC voltage, +5 volt to Common on the terminal strip to the right of the feed I/O strip on the blending controller.  The measured voltage should be in the range of 4.78 page 4 - 9







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