User guide

Alarms
• Shutdown (A#): The dryer has automatically shut down because it has detect-
ed a serious problem that could damage your material or dryer.
• Passive (P#): The dryer continues to operate, but warns of a problem that could
prevent correct drying of your material. If ignored, this problem could lead to a
condition that will shut down the dryer.
Problem
A2 - Process Temperature
Loop Break – If the process
temperature is outside of the
operator entered deviation,
alarm band (see Process High
Temperature Deviation passive
alarm) and the process tem-
perature is not moving
towards the setpoint at a rate
greater than specified, it shuts
down the dryer. Defaults are
set at 3°F {2°C} over 20
seconds.
A3 - Process Heater High
Temperature – The snap
switch in the process heater
tube opens due to excessive
temperature.
Possible cause
Process RTD is loose or has fallen out.
The process heater has failed.
The air lines are restricted or loose.
The process blower is not running or is
running in the wrong direction.
The process heater output on the board
has failed or the output fuse has failed.
Process setpoint is set too low.
Setback setpoint is set too low.
There is an air flow blockage or loose
hoses.
The process blower is not running or
running in the wrong direction.
Solution
Check the process RTD and tighten if
needed.
Check the heater fuses, and resistance
across each leg of the process heater.
Straighten any crimps in the hoses.
Tighten any loose hoses.
Correct the cause of the non-running
blower or reverse the rotation of the
blower.
Replace the board or the fuse for the
output.
Adjust to higher setting or add a
precooler.
Adjust to higher setting or add a
precooler.
Locate and remove any airflow
restrictions.
Tighten any loose hoses.
Correct the cause of the non-running
blower (blown fuse, etc.) or reverse the
rotation of the blower. See Installation
section entitled, Checking for proper air
flow.
6-6 l Troubleshooting
When supplied for central drying applications, these shutdown alarms are not available.
(continued)