Thermo AC-4000 - User Manual

Questions and Answers

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Edward RobinsonAug 3, 2025
What to do if the Thermo Controller displays "A/D Over Ranged" message?
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  William CraigAug 3, 2025
  If the Thermo Controller displays the message "A/D Over Ranged", it means the input from the loadcell has exceeded the A/D input range. Check for objects on the weightable that exceed the loadcell capacity. Also, the conveyor may be slowing or stopping, so display the speed on the front panel and readjust the speed potentiometer to correct the speed. Check the speed calibration constant and speed sensor. Other solutions include cleaning the machine, adjusting or replacing the timing belt (refer to Drive Belt Replacement and Adjustment Procedures in the weightable manual), lubricating bearings, or replacing them if defective (refer to Chain Drive Sprocket Replacement Procedures in the weightable manual), and retightening any loose set screws on the drive sprocket or motor timing gear.
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Morgan WatsonAug 18, 2025
How to fix a blank front panel on Thermo Controller?
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  Alyssa PetersenAug 18, 2025
  A blank front panel on the Thermo Controller with no lamps lit and no keyboard response can be caused by several issues. It may be due to incorrect DC voltage, requiring you to perform power supply troubleshooting procedures (refer to Table 4-2). It could also be a bad display, in which case you should replace the defective Display Module (refer to Display Module Replacement Procedures in this chapter). Other potential causes include a defective Analog Board (replace it following Analog Board Replacement Procedures in this chapter) or a defective front panel (replace it following Front Panel Replacement Procedures in this chapter). Also, check for objects between the loadcell and weightable.
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Eric DavisNov 9, 2025
Why does the Thermo Controller conveyor slow down or stop?
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  carlos37Nov 9, 2025
  The conveyor slowing down or stopping on the Thermo Controller can be due to several reasons. It could be caused by seizure of motor shaft bearings, in which case you should remove the drive motor and rotate the shaft, replacing the drive motor if the bearings are defective (refer to Motor Replacement Procedures in the weightable manual). Another cause could be a blown drive motor fuse due to motor overload or jam; check the drive motor fuses on the Distribution Board, clear any jam, or replace the defective drive shaft bearing (refer to Chain Drive Sprocket Replacement Procedures in the weightable manual), and install new fuses. A blown fuse could also indicate shorted wiring, so measure the motor wiring isolation with respect to chassis ground using an ohmmeter to locate and correct the ...
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William BarnesNov 24, 2025
What to do if Thermo Controller has no interlocks?
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  Mitchell AlvarezNov 24, 2025
  If the Thermo Controller shows no interlocks (using the Interlock Test menu), it could be due to several reasons. The interlock might be dirty, so try cleaning it. It could also be misaligned or have a blocked path; realign the interlocks or remove any blockage, using the visible red indicator light on the receiver as an aid. You can also troubleshoot the wiring by checking for +12 VDC between terminals TB4-17 and TB4-18 on the Junction Box Board; if the voltage is incorrect, perform the Power Troubleshooting checklist per Table 4-2. The interlocks might also be burned out or defective, requiring replacement (refer to Interlock system Replacement Procedures in the weightable manual). Other possible solutions include replacing the defective Analog Board (refer to Analog Board Replacement Pr...