NWB & NWB-HC IM28 OCT 2014
Page 29
Instruction Manual NWB & NWB-HC IM 28 OCT 2014
14.0 TROUBLE SHOOTING and ERROR MESSAGES
TROUBLE
PROBABLE REASON
CORRECTIVE ACTION
1. Unit not running
Control main circuit
breaker tripped.
Main power off.
Control power
interrupted.
Reset the breaker.
Check line and main.
Check per item as per electrical wiring
diagram.
2. Material in hopper
melts.
Process temperature
controller set too high
for material being
dried.
Temperature probe not
installed in process air
stream.
Process blower rotating
in wrong direction.
Temperature sensor
connection loose or
reversed.
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.
3. Reactivation
(regeneration)
temperature too
high.
Reactivation
temperature set too
High.
Check set-temperature on NWBDC
controller. it should be 380°F (190°C)
4. Reactivation
(regeneration) heat
too low (Rotor not
fully reactivating.)
Reactivation
thermostat setting too
low
Reactivation
temperature controller
set too Low
Reactivation heaters
faulty.
Adjust thermostat for proper
reactivation heat at around 380° F
(190°C)
Check set temperature on NWBDC
microprocessor controller. it should be
380° F. (190°C)
Replace heaters.
