Sterling SDA 1000-5100 ユーザーズマニュアル

Large Dehumidifying Dryers 

Troubleshooting 

50 

Process heaters are faulty.  

Replace. 

Desiccant beds are  contaminated.   Replace desiccant.  
Material being dried differs from 
material specified at the time of 
purchase.  
 

Drying systems are designed for 
the material that was originally 
specified. Different materials may 
need a longer residence time or 
different drying temperature. 

Break in flex hose to/from drying 
hopper. 

Inspect for air leaks; replace if 
necessary. 

Loss or reduction in 
drying capacity. 
 

Blower fins filled with dust or 
contaminants. 

Remove blower side plate, clean 
baffles, replace. Replace filter 
elements. 

Process temperature set too high 
due to operator error.  
 

Check resin manufacturer's data 
sheet for proper drying 
temperature. Make sure plant 
personnel are aware of the correct 
process temperature Set Point. 

High temperature alarm not set 
properly.  

See Section “Temperature Screen 
Setup”

on page 29. 

Material in drying 
hopper cakes, or 
meltdown occurs. 
 

Process set point is out of 
acceptable range. 
 

Restore temperature controller to 
factory pre-sets. Auto-tune if 
necessary. 

Burned out regeneration heater. 

Repair or replace.  

Contaminated or worn out 
desiccant. 

Replace. 

Leaking process air hoses. 

Repair or replace. 

Dryer is being operated beyond its 
capacity. 

Check dryer and drying hopper 
sizing.  

Bad dew point sensor. 

Replace.  

Poor Dew Point 
Performance. 

Fouled dew point sensor manifold.  Clear obstruction. Air should flow 

freely through sensor.