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Dryer Master DM510
Operations Manual
Appendix 2: Troubleshooting - Control
The DM won’t go into Automatic
First make sure that the green Ready light is lit. If the light is not lit then the DM does not yet have
enough accurate information to take over control. If you have been running for more than two dryer
loads and the Ready light has still not come on call the Dryer Master Support Center.
Trying to go into Automatic when the system is not READY will provide the operator with a message
to indicate the reason why the system will not go into Automatic
Why won
’
t the DM go Ready?
There are a couple of possible reasons. The first thing to do is to make sure that there are no alarm
lights lit (the red LEDs on the top left of the panel). The DM can not go Ready if any critical alarm is
active.
Next to go Ready the DM has to meet a few conditions. First the current outlet moisture has to be
within 2 % of the moisture setpoint (target) and second the predicted outlet moisture (by the Dryer
Master model) must be within 2% of the actual moisture, [You can check the predicted exit moisture
by pressing Support, then Diagnostics, then Up Arrow. The bottom number in the PEM column is the
predicted exit moisture] and of course no alarms can be on.
Note even if the DM Ready light goes on you should always check that the suggested rate on the
screen is reasonable before going into Automatic.
Why does the DM speed up / slow down when I go to auto ?
Often when you first start up for the day the first grain that comes out of the dryer can be over dried
after having sat in the dryer for a while. So if you are running below target for the first hour and then
go into automatic the DM is going to want to run above target for a while to have some under dried
grain to mix with the over dried grain and give you your overall target moisture once everything has
tempered in the bin. If you don't want this to happen at start up then start with a lower target
moisture and then move it up gradually to where you want it to be. In this way the DM will not try to
compensate as much for your over dried grain.
In the same way, if you have been running above target for a while and then switch to Automatic the
DM will want to slow down to come below target to give you an average moisture that is close to
target.
The DM uses rate manipulation to reduce the variation at the outlet to get more grain dried closer to
target. These rate changes are more dramatic when the difference between the inlet and outlet
moistures is small.
