6-12 l Troubleshooting
Problem
Process Protection
Differential - If the difference
between the process tempera-
ture exiting the process heater
and the temperature of the air
entering the hopper is greater
than 175°F {97°C} for longer
than 180 seconds it shuts down
the dryer.
Possible cause
The air lines between the dryer and hop-
per are restricted or loose.
The dryer is located too far away from
the hopper.
The process RTD is loose or has fallen
out.
The process blower is not running.
The process hose is not insulated.
Solution
Check for air flow blockages or loose
hoses between the outlet of the dryer and
the inlet of the hopper. Straighten any
crimps in the hoses. Tighten any loose
hoses.
The dryer and the hopper should not be
located more than 10 feet {3 m} apart.
Check the process RTD and tighten if
needed.
Correct the cause of the non-functioning
blower.
Insulated hose is required for high dry-
ing temperatures.
Shutdown Alarms
If the red Acknowledge Alarm LED is blinking, the alarm is a shutdown
alarm. The dryer will shutdown automatically to prevent damage to the
equipment or personnel. Note that once the Acknowledge Alarm button is
pressed once, the blinking red LED becomes solid.
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