AEC WD 350 through WD3000 Dehumidifying Dryers User Manual
Page 22
350-2100 cfm Dryers
Chapter 4: Control Panel
21 of 58
;
The alarm mode and value are factory-set to track 25°F below the process setpoint.
The alarm value is a deviation above the process setpoint.
;
This alarm is informational. If the alarm light stays lit for an extended period of
time, check for blown fuses or possible burnt-out heaters.
;
When the temperature at the thermocouple returns within limits, the alarm clears
automatically.
;
This alarm is delayed on initial start-up to avoid nuisance alarms.
;
The alarm range may be altered. See Section 5-5.
PROCESS BLOWER FAILURE ALARM
;
This indicator lights if pressure switch 2PS detects a loss of process blower air
pressure.
;
All heaters are shut-off until the alarm is cleared.
REGEN BLOWER FAILURE ALARM
;
This indicator lights if pressure switch 1PS detects a loss of regeneration blower air
pressure.
;
All heaters are shut-off until the alarm is cleared.
HIGH REGEN AIR TEMPERATURE ALARM
This indicator lights when the thermocouple below the regeneration heater assembly senses
an abnormally high temperature.
Note: Do not adjust the factory setpoint of 3CNTL, the
1
16
DIN panel-mounted
temperature controller inside the enclosure.
The regeneration heaters are shut-off until the temperature falls below the alarm point. The
regeneration blower will continue to run and cool the heaters and desiccant bed.
The alarm light will clear automatically when the temperature drops below the alarm point,
and the heaters will re-energize automatically.
LOW REGEN AIR TEMPERATURE
This indicator lights if the regeneration bleed temperature has not reached the factory setpoint
of 150
°F within 30 minutes of the start of bed regeneration.
The panel meter (2CNTL) and the PLC monitor the regeneration bleed temperature.
This alarm is informational, and does not affect the regeneration process.
This alarm may indicate a very wet desiccant bed or, if the light does not go off within an
hour, malfunctioning or burnt out regeneration heaters. For more details on the regeneration
monitoring system, see Section 5-7.
CRITICAL ALARM SILENCE
Press this button to turn off the audible alarm and flashing beacon when a critical, operation
stopping alarm occurs.
The alarm will repeat every five minutes unless the problem causing the alarm has been
resolved.