Beko DRYPOINT AC 410, Инструкция по установке и эксплуатации

Страница: 33 / 56

EN
Installation and operating manual
DRYPOINT
®
AC 410 – 495 | DRYPOINT
®
AC 410 – 495 MS 33
4.4.3. Time control
In time control mode, the adsorption cycle for an adsorber is set to 5 minutes.
This adsorption time results from a regeneration time of 4 minutes and a pressure build-up time of 1 minute for the
regenerating adsorber.
1
0
1
0
Y1
Y2
0 min 5 min / 0 min 10 min / 5 min
4 min 4 min 1 min 1 min
0 min
4.4.4. Dew point control (optional)
With dew point control, the adsorption cycles of cold-regenerated adsorption dryers can be adjusted on the basis
of the actual operating conditions. This normally results in longer adsorption cycles, while the regeneration time
remains the same, so that less regeneration air is used.
The user chooses the operating mode (time control or dew point control) at the text display.
The criterion for the extension of the adsorption cycle is the pressure dew point at the dry air outlet of the
adsorption dryer. This pressure dew point is determined by a dew point sensor.
With dew point control, a processing window is defined in the control programme. The two switching points define
the time during which dew point control is to be activated.
Standard settings for switching points: A = - 48 °C; B = -43 °C. Switching point B is automatically set by the control
system.
These settings are always applied, if there are no special customer requirements (e.g. pressure due point must be
< -60 °C).
In dew point control mode, the adsorption dryer continues adsorbing moisture in one of the two adsorber vessels,
until the pressure dew point at the dry air outlet reaches the value set for switching point B.
When switching point B (= -43 °C) is reached, the system continues operation with time mode cycles (5 minutes
adsorption, 4 minutes regeneration, 1 minute pressure build-up), until the set pressure dew point is reached at
switching point A (= -48 °C). Subsequently, the control switches back to dew point-controlled cycles until the
pressure dew point at the dry air outlet reaches again the value set for switching point B.
During the stand-by phase (with load-controlled extended cycle), the regenerated container remains under
operating pressure, so that the adsorber can be switched over instantly from regeneration/stand-by to adsorption.
The current stand-by time is shown on the display.
4.5. Alarm states
If an alarm occurs, the control switched to safety mode. This is indicated on the display ("safety mode", only in
version with dew point control). Press the MODE button to call up the associated fault message, indicting the cause
of the problem. If more than one fault occurred at the same time, repeatedly press the MODE button to view the
individual fault messages.
Adsorber 1 → Adsorption
Adsorber 2 → Regeneration
Adsorber 2 → Adsorption
Adsorber 1 → Regeneration