6
Troubleshooting
Shutdown Alarms
If the red Acknowledge Alarm LED is blinking red, the alarm is a shutdown
alarm. The dryer will shutdown automatically to prevent damage to the
equipment or personnel. Note that when the Acknowledge Alarm button is
pressed once, the blinking red LED becomes solid.
Problem
Process High Temperature –
If the process temperature
exceeds the process high tem-
perature setpoint, it shuts
down the dryer. Defaults are
set to 385°F {196°C} for
20 seconds.
Process Temperature Loop
Break – If the process tem-
perature is outside of the oper-
ator 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.
Possible cause
The process high temperature setpoint is
not at least 10°F {6°C} above the drying
setpoint.
One of the process solid state relays has
failed.
The air lines are restricted or loose.
The process setpoint is too low.
The process heater output on the control
board has failed.
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 too low.
Setback setpoint is too low.
Solution
Reset the process high temperature set-
point at least 10°F {6°C} above the dry-
ing setpoint.
Replace the solid state relay.
Straighten any crimps in the hoses.
Tighten any loose hoses.
Set the process setpoint higher or install
an optional precooler.
Replace the control board.
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 pre-
cooler.
Adjust to higher setting or a add pre-
cooler.
Troublesho oti ng l 6-5
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