Trouble Shooting And Error Messages - NovaTec NovaWheel NWB- DC+ Series User Manual

21.0 TROUBLE SHOOTING and
ERROR MESSAGES
Trouble
1. Unit not running
2. Material in hopper melts. Process temperature controller set too high
3. Reactivation (regener-
ation) temperature too
high.
4. Reactivation (regenera-
tion) heat too low (Rotor
not fully reactivating.)
5. Material in hopper not
getting dried properly.
6. High dew point in
process air from
dryer into hopper.
7. Process blowers not
running.
8. Dew Point Sensor not
working properly.
9. Wheel rotor turning but
not indexing or showing
a RPH speed.
NOTE: When ALARM message is followed by a ?, press the message for more information.
Probable Reason
Control main circuit breaker tripped.
Main power off.
Control power interrupted.
for material being dried.
Temperature probe not installed in process
air stream.
Process blower rotating in wrong direction.
Temperature sensor connection loose or
reversed.
Reactivation temperature set too High.
Reactivation thermostat setting too low
Reactivation temperature controller set too
Low
Reactivation heaters faulty.
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
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 perfor-
mance.
Motor main circuit breaker tripped.
Motor overload tripped.
Not operating
High or erratic dew point
Rotor limit switch not aligned properly.
Rotor drive motor defective.
Corrective Action
Reset the breaker.
Check line and main.
Check per item as per electrical wiring
diagram.
Check set temperature for proper drying
process temperature.
Ensure temperature probe is installed in the
dryer outlet, or in the hopper inlet.
Change blower rotation.
Correct the connection.
Check set-temperature on NWB-DC+
controller. It should be 380°F (190°C)
Adjust thermostat for proper reactivation
heat at around 380° F (190°C)
Check set temperature on NWB-DC+
microprocessor controller. It should be
380° F. (190°C)
Replace heaters.
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.
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.
Reset main circuit breaker.
Rectify fault reset overload and check motor
AMPS are in limit.
Check sensor wiring for tightness and breaks.
Check sensor wiring and check tubing to the
sensor and the sensor for tightness and air
leaks.
Replace the dew point sensor as required
(it should be replaced yearly)
Align the limit switch it should be reset by
limit switch hump on each rotation.
Replace motor
27