HDK-MT350_EN_06
25
Connecting the external signalling lines
In respect of compressor synchronization
The control system is equipped with a digital input as standard for compressor
synchronisation. Regeneration of the dryer during compressor synchronisation is
controlled with the switch S1 on the pc-board of the control system (for switch S1
see Fig. below).
To install the external lines, proceed as follows:
► Connect the signalling line to the potential-free busbar connection of the
compressor to terminals 1 and 2 on the control board (see circuit diagram).
Regeneration in compressor synchronisation mode
Dryers are delivered with the switch S1 set to position OFF at the factory
If switch S1 is in the OFF position, any regeneration process which has been
started, is always continued until completed.
If the switch S1 is in the ON position, dryer regeneration will stop when the
compressor stops. On restarting the compressor, regeneration will continue from
the point at which it was interrupted. An interruption in regeneration is practical
only for short compressor no-load times.
It is recommended to complete regeneration for longer compressor no-load
times. A regeneration gas return facility is required to remove moisture from the
desiccant.
