INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-820 / SD-1710
REV 1 – AUGUST 03,.2001
Page 18
SECTION 3
3.2.4 Alarms
** If any alarms options are supplied with dryer then a PLC will control the timing of the
dryer.
COMMON ALARM RELAY
Common alarm relay comes with any optional alarm. If any one of the alarms are
activated, the common alarm relay will also be activated.
SWITCHING FAILURE ALARM (OPTIONAL, INCLUDED WITH DDS OPTION)
Two pressure switches, sensing desiccant chamber pressure, are provided. An alarm
will be activated if both chambers remain at full pressure when regeneration is
required. Furthermore, if pressure in both chambers remain below set pressure, after
depressurization an alarm will be activated.
NOTE: Dryers equipped with DDS and operating in the DDS mode do not
depressurize during the purge cycle (and do not purge) when an
acceptable dew point is maintained. During this condition the switching
failure alarm is cancelled.
The alarm has a 1-minute delay.
HIGH HUMIDITY ALARM (OPTIONAL, INCLUDED WITH DDS OPTION)
The hygrometer provided has been programmed to initiate an alarm if the dryer outlet
dew point falls below the setting. An alarm light is provided.
NOTE: The alarm has a 20-minute delay when the dryer is first powered up, then
the alarm is instant if the condition exists.
IF THE HYGROMETER BOARD TO PROBE CONNECTION FAILS,
then a fault will observed by the hygrometer. The high humidity alarm light will flash on
and off. The dryer will go into a fixed cycle mode. The digital display will indicate “OPN”.
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