Start-up
HDK350_EN_01_2005-05-10
39
►
Repeat the start-up procedure.
Changing cycle mode (optional)
When
can
I change cycle mode?
If the dryer has been successfully commissioned and is equipped with one of the
following options:
regeneration gas return for compressor synchronisation
or
dewpoint-sensing control
it can be set to
economy cycle
mode.
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 vessels is just below operating
pressure so that a fast pressure build-up is prevented when the vessels are
switched.
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).
Which cycle modes can I choose?
If the dryer is connected to a
compressor synchronisation system
and is
equipped with the
dewpoint-sensing control
option, these two optional devices
can only started together. The compressor synchronisation has thereby
precedence over the dewpoint-sensing control.
With regeneration gas return for compressor synchronisation (optional)
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.
The installed regeneration gas return ensures however that a regeneration cycle
started in one of the vessels is completed. Subsequently, the respective
expansion valve is closed. In standby mode, the control system remains on, and
the dryer is ready for the next switchover, which is made as soon as the
compressor is switched on.
With dewpoint-sensing control (optional)
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 drying agent in the absorbing
vessel is saturated, the vessels are switched.
The dewpoint at which a switchover is made is preset at the factory.
Summary of Contents for HDK 50/100
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