NWDC
IM 26 MAR 2014 © 2014 Novatec, Inc. All Rights Reserved
Page 38
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NWDC IM 26 MAR 2014
TROUBLE
PROBABLE REASON
CORRECTIVE ACTION
5. Material in hopper
not getting dried
properly.
Clogged Filters
Door gasket leaking or
damaged.
Leak in hose.
Hose connection loose.
Wrong process
temperature for material
being dried.
Hopper is running almost
empty.
See #6 below
Process main circuit
breaker tripped.
Inspect, clean/replace filters as necessary
Check all gaskets (filter cover, hopper
doors, and hopper lids) and repair or
replace damaged gaskets.
Replace hose
Tighten hose connections.
Add material to hopper and control the
level higher.
6. High dew point in
process air from
dryer into hopper.
High inlet temperature to
the wheel rotor (should
be less than 150°F per
the display).
Leaks in the system.
High moisture levels in
plastic resin being dried
in hopper, reducing the
drying performance.
Check the cooling water is flowing to the
cooling coil and make sure the
temperature is below 85°F and at the
proper flow.
Check the dryer system & hopper for any
air leaks & repair as required.
Reduce the moisture of the resin being
loaded into the hopper. Keep the resin
sealed until ready for use, to reduce the
amount of moisture being picked up by
the resin from the surrounding air.
7. Process blowers
not running.
Motor main circuit
breaker tripped.
Motor overload tripped.
Reset main circuit breaker.
Rectify fault reset overload and check
motor AMPS are in limit.
8. Dew Point Sensor
not working properly.
Not operating
High or erratic dew point
Check sensor wiring for tightness &
breaks.
Check sensor wiring and check tubing to
the sensor & sensor for tightness and air
leaks.
Replace the dew point sensor as required
(it should be replaced yearly)
9. Wheel rotor turning
but not indexing or
showing a RPH speed.
Rotor limit switch not
aligned properly.
Rotor drive motor
defective.
Align the limit switch it should be reset by
limit switch hump on each rotation.
Replace motor
NOTE:
When ALARM message is followed by a ?, press the message for more information.
