COVER HS Series – User manualCOMEX S.A. 25J8BAT_LOW_NCBAT_LOW_NOGNDFigure 2-30 Interface Bat_LowTable 2-6 Description of interface terminalsPin Description PurposeJ8.1 BAT_LOW_NCRelay indicating low battery voltage - normally closed (J8.1and J8.3). Opening it means a warning about low batteryvoltage.J8.2 BAT_LOW_NO Relay indicating low battery voltage - normally open (J8.2 andJ8.3). Its closure means a warning of low battery voltage.J8.3 GND Common pin for NO / NC signals.2.11.6 Output signal - event warningConnector J9 is a signal that one or more warnings appear on the UPS. Occurrence of at leastone alarm on the UPS causes the relay contacts to close or open. Below the interface descriptionand description of the connection.J9ALARM_NCALARM_NOGNDFigure 2-31 Alarm interface