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6.6.5 ALARMS AND THEIR FUNCTIONS
There are several alarms detected by the DPC™ to alert the user of an out of
tolerance condition. Once each alarm is detected, a description of the alarm will
appear in the screen and the remote alarm contact will close. Note that during the
alarm condition, the SELECT DISPLAY button may be depressed to scroll through
the available parameters. After approximately 30 seconds, the alarm screen will
reappear, provided the alarm condition persists.
The alarm names and description of each are described in detail below. Note that
some alarms will enunciate only after a prescribed alarm delay. Refer to the
TECHNICIAN MODE section of this manual for factory default alarm delay periods
.
HIGH TEMPERATURE ALARM (HITEMP ALARM)
When the thermal mass (glycol) temperature in a HeatSink™ dryer (separator
temperature for NonCycle dryers) reaches the factory alarm set point, after an
alarm delay, the alarm will be activated. This alarm condition may not necessarily
damage the dryer when subjected to long-term exposure. It may, however, have a
significant impact on downstream processes and thus should be investigated upon
detection. Note that this alarm will not shut down the dryer. This alarm will activate
the remote alarm contact and reset automatically once the alarm condition is
rectified.
LOW TEMPERATURE SAFETY ALARM (LOWTEMP ALARM)
If the dryer chiller temperature falls to or below the factory set point and remains at
or below this set point for the factory delay time, the alarm routine will activate.
This alarm condition may cause damage to the dryer when subjected to continuous
or long-term exposure. Note that this alarm will shut down the dryer after a
response time delay. This alarm will activate the remote alarm contact and reset
automatically once the alarm condition is rectified.
HIGH PRESSURE CUTOUT ALARM (HPCO ALARM)
If the discharge pressure of the refrigerant is determined to be above the set point,
the alarm routine will activate. This alarm condition may cause damage to the
dryer when subjected to continuous or long-term exposure. Note that this alarm will
shut down the dryer after a response time delay. The operator must depress the
RESET button in order to clear the alarm and restart the refrigeration system
.
LOW PRESSURE CUTOUT ALARM (LO PRESS CO)
If the suction pressure of the refrigerant is determined to be below the set point of
the LPCO alarm, the DPC alarm routine will activate. This alarm condition may
cause damage to the dryer when subjected to continuous or long-term exposure.
Note that once cleared, the compressor will restart automatically. However, if two
successive low-pressure conditions are determined, this alarm will shut down the
dryer after a response time delay and will display the alarm condition. The operator
must depress the RESET button in order to reinstate the compressor.
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