Operating and control elements
HDK-CNG_EN_03_2016
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Control elements on the switch cabinet
The dryer can only be controlled in an Ex-protected zone with the controls on the
switch cabinet. For this, controls are located under the control switch cabinet.
These controls function as follows:
Menu key S2 runs through the individual menu items.
—
By pressing the S2 key for longer (>2s) it is possible to
change between the individual menu levels.
—
By briefly pressing the S2 key, the sub-menus of the selected
level are called up.
Faults are acknowledged by pressing key S3 (>3s) for longer.
To start/stop the dryer using the controls on the switch cabinet, use the following
keystroke combination:
► Press and hold down key S3, and at the same time press menu key S2.
The choice between local and remote control is performed via the
menu
Customer Setting
in the relevant sub-menu (refer to page 61 for details of menu
layout).
To enable the remote function, the desired
alternative must be shown in brackets.
Press the
key to return to the screen status.
Note:
With keys S1 and S2 parameter settings can be made. To change the
factory settings, the Ex zone must be cancelled and the cover with
protective glazing must be removed.
Other display elements
Vessel pressure gauge
On both vessels, pressure gauges are fitted which show the operating
overpressure. The operating overpressure indicates the operating phase of the
relevant vessel:
During adsorption the pressure gauge should indicate the nominal operating
overpressure.
During regeneration the indication of the pressure gauge on the regenerating
vessel
—
During the expansion phase, reduce from positive operating pressure to
compressor inlet pressure (CIP)
—
During the dehumidification phase, display the compressor inlet pressure.
During the pressure build-up phase the indication on the pressure gauge should
again rise to operating overpressure level.
