Start-up
A190-930TX_EN_03_ 2009-02-06 37
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 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.
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.
How do I change cycle mode?
► Wait until the dryer has reached the pressure build-up phase (phase prior to
switchover).
One LED for Adsorption B1/B2 is on in the flow diagram.
► Set the ON/OFF switch to position II.
The programme continues the cycle.
ON/OFF switch
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