HDK-MT350_EN_06
33
Then proceed as follows:
Remedy fault
► Look up possible cause of the fault, and how to remedy the same, in the
table on page 60.
► Remedy fault.
► Repeat the start-up procedure.
Recommended operating modes in the individual phases
On successful conclusion of initial operation, the dryer can be operated in
different modes:
Compressor synchronisation control and
Dewpoint-sensing control
Compressor synchronisation mode
as well as
dewpoint-sensing control
can only
be started together. Compressor synchronisation has priority over dewpoint-
sensing control.
Compressor synchronisation
If compressor synchronisation is enabled, the dryer can only be operated in
conjunction with the compressor.
As soon as the compressor is switched off, the dryer is automatically set to
standby mode. In standby mode, the dryer remains switch on and is operational
as soon as the compressor is switched on again. For information on regeneration
see Page .
With dewpoint-sensing control
Dryers equipped with dewpoint-sensing control operated in variable cycle mode,
based on the measured dewpoint of the dried air at the compressed air outlet. As
soon as a certain dewpoint is reached, as the desiccant in the absorbing vessel is
saturated, the vessels are switched. The dewpoint at which a switchover is made
is preset at the factory.
When should I change cycle mode?
Cycle changes should be made during the pressure build-up phase and prior to
switchover; during this phase, the pressure in both towers is virtually at the same
operating pressure so that fast pressure build-up is prevented when the towers
are switched over.
During this period, only the adsorption LED is on in the diagram, and the digital
display shows step 4 or step 9 for the duration of 1 minute (see logic control
diagram; not displayed with dewpoint sensing).
During the pressure build-up phase, only one diode
Adsorption B1/B2
lights on
the flow diagram and both towers are at the same operating pressure.
► Set the ON/OFF switch to position
II
.
The programme continues the cycle.
