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6-8 l Troubleshooting
Shut Down Alarms
Problem
A49 Process Protection
High Temperature – If the
process protection temperature
exceeds the process protection
high temperature setpoint, it
shuts down the dryer. Defaults
are set to 600°F (315.6°C) for
10 sec.
A50 Process Protection
Differential Temperature – If
the process protection differen-
tial temperature exceeds the
process protection differential
temperature setpoint, it shuts
down the dryer. Defaults are
set to 295°F (146.1°C) for
180 sec.
A51 Process Protection RTD
Integrity – If the process RTD
is faulty, it shuts down the
dryer.
Possible cause
The Process RTD temperature probe is
not installed correctly.
The air lines are restricted or loose.
The process protection differential tem-
perature setpoint is not at least 37°F
(3°C) above the drying setpoint.
The Process RTD temperature probe is
not installed correctly.
The air lines are restricted or loose.
The connection in the electrical enclo-
sure for the process protection RTD is
loose.
The connection of the RTD plug on the
control board is loose.
The process protection RTD has failed.
Solution
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.
Reset the process protection differential
temperature setpoint at least 37°F
(3°C) above the drying setpoint.
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.
Check the RTD plug connection and
tighten if needed.
Check the plug connection and tighten if
needed.
Replace the process protection RTD.
Central
When supplied for central drying applications, these shut down alarms are not available.