Operating and control elements
HDK-CNG_EN_03_2016
23
Operating and control elements
Control cabinet
Ex d control
cabinet
Control system
Cover with
protective
glazing
Ex e control
cabinet
Control cabinet
control
elements
Under the control cabinet is a switch box with controls. Using these controls, the
dryer can also be controlled in an Ex zone.
The main switch is the On/Off switch on the dryer.
In the ON position, the dryer is switched on. The main valves are
opened. The drain of the first filter is still in operation. The regen-
eration piping is drainig small gas flow back to the compressor.
In the 0ff setting, the power supply is interrupted and the dryer is
out of operation. The main valves are closed and de-energised.
That means that the dryer is closed in its main direction of flow
and no flow through thr dryer no flow to the regeneration piping..
With switch S1 and with the optional
dewpoint control
it is possible to
set the operating method of the dryer using either the
fixed
or the
variable
c
ycle
. When the
variable
c
ycle
is selected, synchronous
compressor operation is also selected.
With the menue button S2, it is possible to page between the
individual menus-levels and in different operator levels.
This means that the dryer can also be operated in an Ex zone. Refer
to section “
“ for details of how this button functions.
With the button S3, fault messages are acknowledged. Acknowledging
a fault message is not possible until the fault has been remedied. The
button continues to be used to confirm actions.
Whenever there is a fault on the dryer, lamp H1 lights up.
