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350-2100 cfm Dryers Chapter 7: Troubleshooting 54 of 58
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Material in drying hopper
cakes, or meltdown occurs.
A. Process temperature set
too high due to operator
error.
A. Check resin
manufacturer's data sheet
for proper drying
temperature. Make sure
plant personnel are aware
of the correct process
temperature Set Point.
B. High temperature alarm
not set properly.
B. See Section 5-5.
C. Process set point is out
of acceptable range.
C. Restore temperature
controller to factory pre-
sets. Auto-Tune if
necessary. See Sec. 6-11.
Poor Dew Point
Performance.
A. Burned out regeneration
heater.
A. Repair or replace.
B. Contaminated or worn
out desiccant.
B. Replace.
C. Leaking process air
hoses.
C. Repair or replace.
D. Dryer is being operated
beyond its capacity.
D. Check dryer and drying
hopper sizing.
E. Bad dew point sensor. E. Replace.
F. Fouled dew point
sensor manifold.
F. Clear obstruction. Air
should flow freely through
sensor.