AEC AP Series Large Dehumidifying Dryer - Manual (Page 79)

Large Dehumidifying Dryers Controls 78
Alarm Text Abbreviations
The 5.4” touch screen limits the amount of characters that are visible on the alarm banner and
alarm history displays. The following list displays text that is commonly abbreviated and its
expanded description.
CLS = CLOSE
OPN = OPEN
OVLD = OVERLOAD
REDUN. = REDUNDANT
PH = PROCESS HEATER
ISO = ISOLATION CONTACTOR
DH = DRYING HOPPER
Temperature Alarms
The AP1+ checks for high low and fail to change (loop break) alarm conditions on the
regeneration inlet temperature and the drying hopper process supply air temperature. It also
checks for high temperature on the dryer exit and the pre-cooler (or after-cooler) if the option
is installed.
A high temperature alarm is generated when the actual temperature rises above a pre-set
limit, or when the difference between the actual temperature and a controlling set point (if
one exists) is greater than a calculated limit. High temperature alarms are always treated as
critical alarms.
A low temperature alarm is generated when the actual temperature falls below a pre-set limit,
or when the difference between the actual temperature and a controlling set point (if one
exists) is less than a calculated limit. Low temperature alarms are always treated as non-
critical alarms.
A loop break alarm is generated when a controlled temperature fails to rise by X degrees
every Y seconds while its heaters are consuming power. The setting values associated with
loop break alarms are automatically calculated following the completion of an auto-tune.
Loop break alarms are always treated as critical alarms.