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NWB & NWB-HC IM28 OCT 2014
Page 30
Instruction Manual NWB & NWB-HC IM 28 OCT 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 and 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.