Page | 78
Dryer Master DM510
Operations Manual
In Local mode the dryer speed control and the DM speed control do not
read the same.
Call the DM support Center and we will help you retune the calibration of the dryer motor speed
control and the DM
The DM takes a long time to get Ready
Check to see that the following settings are correctly implemeted:
“
Dryer discharge off rate
”
and
“Burner
off temperature
”
. If these are not correct the DM may not have known the dryer was off and
kept calculating numbers for its model. This means the model will need a dryer load or two to
correct its information.
To check the Settings:
a)
Press the Settings key
b)
Press “1” for Supervisor set
-up
c)
Enter the password “123”
d)
Press “1” f
or Control Limits.
e)
Check the “Dryer discharge off rate”. It should never be “0”. It
should be above zero, but
below where you would run the dryer while drying. So for example if you usually run at a
rate of 20-
60, set the value at ”5”
f)
Check the Burner off temperature. This should be set about 30F below the low temperature
you would dry at. So if you normally dry at 180F, set it at 150F. It must also always be above
ambient temperature and well above the plenum temperature after the cool down cycle.
Appendix 3: Troubleshooting - Moisture Sensors
The inlet sensor is reading 1% too high. Should I calibrate?
No. As long as the inlet reading is within 1-2% of actual that is fine. The DM is most concerned with
the
change
in the inlet moisture not the actual reading. If you calibrate quite frequently the DM will
think that these are real changes and react accordingly.
The outlet moisture keeps moving up and down. Why?
All kernels do not come out of the dryer at the same moisture. This is the normal variation that you
normally don't see if you only take hourly samples. By continuously looking at the real time
moistures as they move up and down the DM is able to have more accurate averages with which to
make control decisions. You may also see that moisture variations tend to be more pronounced on
round tower dryers as the different columns may dry and unload at different rates.
