Installing the electrical connection
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HDK-CNG_EN_03_2016
Installing the supply cable
The components of the dryer have been connected to the control cabinet at the
factory. You only need to connect the control cabinet to the electrical supply
cable.
► Ensure that the cross-section of the electrical supply cable corresponds to
the power rating of the dryer and the electrical voltage provided by the
customer (pay attention to the electrical circuit diagram at the same time).
► Connect up the cables in accordance with the electrical circuit diagram.
► In all phases the dryer must be protected against short circuits by means of
fuses.
► In order to relieve cable strain, re-tighten the union.
Connecting the external signalling lines
In respect of compressor synchronisation
The controller is fitted as standard with a digital input which makes the dryer
regeneration dependent on operation of the compressor.
Following compressor contact, operation of the compressor and dryer
regeneration run synchronously: When the compressor is stopped, the dryer
regeneration also stops. When the compressor restarts, regeneration also
restarts.
To install the external lines, proceed as follows:
► Connect the signalling line to the potential-free busbar connection of the
compressor in accordance with the electrical circuit diagram).
For operational monitoring
Here there is the option of connecting the dryer to a fault signalling system via a
potential-free operation signalling contact. Messages such as:
Dryer on (contact made)
Power supply disconnected (no contact)
Dewpoint alarm (only with
dewpoint-sensing control
option, no contact)
can be displayed centrally, e.g. in a control room.
To install the external lines, proceed as follows:
Connect up the lines in accordance with the electrical circuit diagram.
Remote control of the dryer
The dryer can be monitored externally and the regeneration can be started or
stopped.
Therefore the dryer must be set to „Remote“.
For installation proceed as follows:
► Connect the signal line of the potential-free contact of the compressor
according to the wiring diagram.
Check bolt connections
Before the initial start-up:
► Check all unions and bolt connections as well as the terminals in the control
cabinet for secure seating; re-tighten if necessary.
