Liebert NX UPS System Output Dry Contacts, Output dry contact relays, +12V J13 J21, J28

Single Module UPS Installation

1.8.4Output Dry Contacts

There are three output dry contact relays at the X1 slot (see Figure 5 and Table 6)

Figure 5 Output dry contacts and EPO wiring

+12V

X1

J13

J21 J25

J28

X2

BFP C BFP S BFP O

INV C INV S INV O ACF C ACF S ACF O

EPO - NO EPO - NC

Table 6	Output dry contact relays
Position		Name	Description
J13.2		BFP_O	Bypass feedback protection relay; normally open; closed when bypass SCR is shorted
J13.3		BFP_S	Bypass feedback protection relay center
J13.4		BFP_C	Bypass feedback protection relay; normally closed; open when bypass SCR is shorted
J21.2		INV_O	Inverter mode relay; normally open; closed when UPS is in inverter mode
J21.3		INV_S	Inverter mode relay center
J21.4		INV_C	Inverter mode relay; normally closed. Opened when UPS is in inverter mode
J25.2		ACF_O	Main input fault relay; normally open. Closed when main input is in fault
J25.3		ACF_S	Main input fault relay center
J25.4		ACF_C	Main input fault relay; normally closed. Open when main input is in fault

NOTE

All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm2

(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.

14