Emerson Liebert NX User Manual download pdf (Page 22)

Single Module UPS Installation

1.8.4 Output 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

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 0.5-1.5mm

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

EPO - NCEPO - NO

X2X1

BFP_C

J21 J25 J28

BFP_S

BFP_O

INV_O

INV_S

INV_C

ACF_C

ACF_S

ACF_O

J13

+12V

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Emerson Liebert NX User Manual Page 22