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Blending Controller - TM-5-3895-374-24-2_764
Blending Controller Fails to Respond

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 to 5.22 volts DC. 6. If out of range, continue monitoring the voltage and unplug the CRT, BLEND & FEEDER cards. 7. If still out of range, replace the POWER SUPPLY card. 8. Plug in the CRT card. 9. If now out of range, replace the CRT card. 10. Plug in the BLEND card. 11. If now out of range, replace the BLEND card. 12. Plug in the FEEDER card. 13. If now out of range, replace the FEEDER card. If in range, replace the SINGLE BOARD COMPUTER (SBC) card and repeat tests beginning at step 5. Incorrect Liquid Asphalt Temperature Display Inspect all sensor cables and connections. 1. Measure the sensor DC output voltage at terminals 9 (+) and 10 (-) on the BLEND I/O strip.  The voltage scaling factor should be within the range of (0.0 to 1.1 volt DC) per 100° F. 2.    If the voltage is 1, go to PROCEDURE 3, SENSOR EXCITATION VOLTAGE. 3.    If the measured voltage is out of the expected range, re-calibrate the probe according to the users manual. 4.    If  the  measured  voltage  is  out  of  the  expected  range,  disconnect  the  asphalt  temperature  probe  from  the  AC TEMPERATURE  PROBE  AMPLIFIER  and  measure  its  resistance.    The  theoretical  resistance  should  be  100 ohms plus 0.214 ohms per degree F above 32 degree F.  (IE at 300F --- 100 + 270 * .214 = 158 ohms) 5.    If the measured resistance equals the theoretical resistance within 10% replace the AC TEMPERATURE PROBE AMPLIFIER and re-calibrate the sensor according to procedures in the operators manual. 6.    If the measured resistance does not equal the calculated resistance within 10%, replace the temperature probe and re-calibrate the sensor according to procedures in the operators manual. page 4 - 10







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