External Control Board And Digital I/O; Main Board Confi Guration - Carel pR300T Mode D'emploi

ENG
6. EXTERNAL CONTROL BOARD
AND DIGITAL I/O
Fig. 6.a
This type of confi guration uses an external board to manage parallel compression, without being connected
to the main board via serial cable.
Theoretically this solution can be used with any pRack controller: Compact, pR100, pR100T, pR300, pR300T.
Nonetheless, it is recommended to use a controller for transcritical systems, i.e. pR100T or pR300T.
Main board confi guration
When the control conditions concerning fl ash valve opening percentage and gas cooler outlet temperature
are right, the parallel compression activation signal is sent via a digital output. The DO used can be set on
screen Cca13:
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