Sometimes when the Tower dryer is filled with very wet grain for the first time (25% to 30%), the discharge system locks up. What caused this and how can I prevent this from happening in the future?
Wet grain is heavy and packs in around the sweep agitator finger. This prevents the sweep from moving. The grain in the cooling section must be recycled. Therefore, on initial fill, run the discharge at minimum speed so this grain does not get packed and lock up the sweep finger.
- If the safeties of the auxiliary equipment are connected to C5 & C6, check out the auxiliary equipment.
- Possible defective whisker switch (Profiles), mercury switch (Older profiles), or rotary bin switch (Towers).
The VFD does not run, even in local control. I have the proper voltage to the VFD and the keypad is illuminated. How do I fix?
- Check the 24vdc circuit breaker in the high voltage cabinet. Use a voltmeter to verify 24vdc is present.
With profile dryers, determine the RPMs of the metering rolls by observing the metering rolls stub shafts at the end of the dryer. Multiply this number by the appropriate factor:
- 8’ 74 bu x RPM = Bu/hr
- 12’ 111
- 16’ 146
- 20’ 182
- 24’ 220
My metering or sweep will run for a few seconds and then the dryer dies and the HMI screen displays a “Discharge Jam/Proximity Switch” warning.
- Verify that the metering rolls or sweep are not physically jammed or locked up.
- Verify the motor runs.
- Verify that the proximity switch is as close to the target surfaces as possible without touching.
- Check the cable connection at the proximity switch for tightness or moisture.
- Pass a piece of metal in front of the face of the proximity switch. If the switch is good, you will see a small light illuminate on the switch. Verify by observing on the Digital Inputs screen if “I0.6-Disch Prox” is green. If one or neither happens, replace the proximity switch.
Yes. Use terminals C3 & C4 (which are dry contacts found in the high voltage cabinet) as the command signal for the VFD you are adding. The speed signal for your VFD will be obtained from the dryer’s VFD. Consult your M-C dealer for proper connections.
- Yes, in manual or TruDry control. You will need to manually sample and test the moisture of the discharge grain with an external moisture tester.
Sometimes, the grain characteristics might cause a faster discharge rate than normal. Possible corrections:
- If equipped with 4 sweep arms, remove two.
- If equipped with two agitator fingers, remove one.
- Move the sweep fingers at the end of the sweep arms, back one hole each.
- The amount of time the sampler auger runs is controlled by the Mini Auger Timer, found in the high voltage cabinet. Set this timer to the maximum setting.
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