Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 46)

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9.4.5.3 Control card – HYDROVAR SINGLE Inverter (not for HV 4.150 – HV 4.220)
The control card is connected to the power unit via a ribbon
cable on terminal X8.
The display is connected to terminal X9
The display can be mounted in normal position (0°) or
upside down (180°).
X5- Status- Relays
X3- Digital / Analogue –I /O
RS485 - Terminal