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Troubleshooting
Shut Down Alarms
If the red Acknowledge Alarm LED is solid, the alarm is a shutdown alarm.
The heater will shutdown automatically to prevent damage to the equipment
or personnel.
Possible cause
The process high temperature is not at
least 10°F (5.6°C) above the setpoint.
The RTD temperature probe is not
installed correctly.
The air lines are restricted or loose.
SSR has failed.
Output on the board has failed.
Process RTD is loose or has fallen out.
The process heater has failed.
The air lines are restricted or loose.
Output on the board failed “Open”.
Drying or setback setpoint is too low.
Solution
Increase the process high temperature.
Make sure the RTD temperature probe
tip is in the center of the hopper inlet
tube.
Straighten any crimps in the hoses.
Tighten any loose hoses.
Replace the SSR.
Replace the 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.
Replace the board.
Adjust the setpoint.
Add additional cooling, either a pre-
cooler or an after
cooler
, to the circuit.
Problem
A1 Process High
Temperature – If the process
temperature exceeds the
process high temperature set-
point, it shuts down the dryer.
Defaults are set to 385°F
(196.1°C) for 20 sec. for CP
HTCs, and 360°F (182.2°C)
for 20 sec. for HADs.
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 (1.7°C) over 20 sec.
(continued)
Troubleshooting l 6-5