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6-10 l Troubleshooting
Passive Alarms
If the amber Acknowledge Alarm LED is blinking, the alarm is a passive alarm.
The dryer continues to operate, but this problem could prevent correct drying of
your material. Note that once the Acknowledge Alarm button is pressed once, the
blinking amber LED becomes solid.
Problem
P1 Process Temperature
Deviation – The process tem-
perature exceeds the deviation
band as entered for the speci-
fied time. Default values are
43°F (6°C) for 5 sec.
P2 Process Low
Temperature – The process
temperature is less than the
low temperature setpoint for
the specified time. Default
values are 70°F (21.1°C) for
20 sec.
P3 Regen Temperature
Deviation – The regeneration
temperature exceeds the devi-
ation band for the specified
time. Default values are 43°F
(6°C) for 5 sec.
Possible cause
One of the solid state relays (SSRs)
failed in the closed position.
The process RTD is loose or has fallen
out.
The air hose connections are loose.
Precooler water is too cold, or the water
flow rate is too high.
The process RTD is loose or has fallen
out.
Process heater has failed.
One of the solid state relays (SSRs)
failed in the closed position.
The regeneration RTD is loose or has
fallen out.
The air hose connections are loose.
Solution
Replace the failed solid state relays
(SSR).
Check the process RTD and tighten if
needed.
Tighten all air hose connections.
Check water temperature and flow
settings. Adjust as necessary.
Check the process RTD and tighten if
needed.
Check the heater fuses and resistance
across each leg of the process heater.
Replace the failed solid state relays
(SSRs).
Check the regeneration RTD and tighten
if needed.
Tighten all air hose connections.
Central
When supplied for central drying applications, these passive alarms are not available.