Aircel ABP Series, Руководство по установке и эксплуатации

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Blower Purge Desiccant Air Dryer | ABP Series
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VESSEL CHANGEOVER
Time Controlled
The PLC control system initiates the changeover procedure
when the timed regeneration and re-pressurization phases for
the off-line chamber are complete.
With the standard EMS (Energy Management Control System),
the Time Controlled or Dew point Controlled drying mode can
be selected at any time during the cycle.
Dew Point Controlled
The standard EMS (Energy Management control System)
initiates the changeover procedure when the timed
regeneration, re-pressurization, and the dew point drying
extension phases for the off-line chamber are complete.
When the dryer is in the Dew point Controlled mode, the
effluent dew point is continuously monitored to determine
if the drying period can be extended or if vessel changeover
is required. If a high dew point is sensed at dryer outlet,
changeover at the end of the re-pressurization results; if a
low dew point is sensed at dryer outlet, dew point extension
drying results.
Dew point extension drying can occur for up to 6 hours on
the on-line desiccant chamber. During this extended drying
period, dew point at the dryer outlet is monitored and if
the high value is sensed, an immediate vessel changeover
occurs. If this value is not sensed, vessel changeover occurs
at the end of the 6 hour drying extension period.
At each vessel changeover, the chamber that was in service
is regenerated. Time Controlled operation can be selected at
any time while in the Dew point Controlled mode.