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Start-up
K-MT 1-4/D3
29
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:
◊
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 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 control system remains on, and the dryer is ready for the next switcho-
ver, which is made as soon as the compressor is switched on.
Note:
The compressor synchronisation controller is a higher-level controller than the
pressure dew point controller. When both options are in place, the compressor
synchronisation controller is treated as the prime controller.
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 drying agent in the absorbing chamber is saturated, the cham-
bers 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 fl ow diagram.
Set the ON/OFF switch to position
II
.
The programme continues the cycle.
