1592001830 XC645D GB r3.4 04.09.2017.docx XC645D 37/50
19.2 Flood protection function
To ensure the maximum safety of the plant, a relay is activated when the compressors can’t be
switched on since they are blocked due to safety times or for other issues or stopped for
maintenance.
This output can be used to block the liquid injection to the cabinets to avoid to flood the suction
collectors.
The relay will be disabled once the compressors can restart (see scheme ).
To enable this function set one relay by the parameters oA2 or oA3 or oA4, as flood protection,
EI oA4 = Liq, and then connect it to the external device that blocks the cabinet injection.
NOTE: the relay set as flood protection is automatically activated even when the controller is in
stand-by mode.
NOTE
If the compressors are activated in fix sequence, (Sty = no), and the compressor that has to be
activated is locked by safety timers, the relay set as flood protection is switched on till the safety
timers are over.
19.3 Suction superheat monitoring
Controller can monitor the suction superheat, and signal situations of low superheat, with a pre-
alarm and alarm thresholds.
According to the settings, compressors can be stopped in case of low superheat alarm, to
preserve compressor integrity.
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