Output Dry Contacts; Emergency Power Off Input; Figure 4 Output Dry Contacts And Epo Wiring For Firmware Before M162; Figure 5 Epo Wiring For Firmware M200 Or Later - Emerson Liebert NX 400V User Manual

1.8.4

Output Dry Contacts

There are three output dry contact relays at the X1 slot (see Figure 4 and Table 6)
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 50m (82-164 ft.) respectively.
Figure 4 Output dry contacts and EPO wiring for firmware before M162
X1
J13
Table 6 Output dry contact relays for firmware before M162
Position Name
J13.2 BFP_O
J13.3 BFP_S
J13.4 BFP_C
J21.2 INV_O
J21.3 INV_S
J21.4 INV_C
J25.2 ACF_O
J25.3 ACF_S
J25.4 ACF_C
Figure 5 EPO wiring for firmware M200 or later
1.8.5

Emergency Power Off Input

The UPS has an Emergency Power Off (EPO) function that operates by a button on the control panel
or by a remote contact provided by the user. The EPO button is under a hinged, clear plastic shield.
The X2 slot, shown in Figure 4, is the remote EPO input interface. The EPO has an NO/NC contact
point that becomes active when shorting terminals X2: 3 and 4 or open terminal connection X2: 2 and 1
If an external emergency stop facility is required, it is connected terminals X2: 1&2 or X2: 3&4 of the
auxiliary terminal block (X2). It also is connected to the normally open or normally closed remote stop
J21
Description
Bypass feedback protection relay; normally open. Closed when bypass SCR is shorted.
Bypass feedback protection relay center
Bypass feedback protection relay; normally closed. Open when bypass SCR is shorted.
Inverter mode relay; normally open. Closed when UPS is in inverter mode.
Inverter mode relay center
Inverter mode relay; normally closed. Open when UPS is in inverter mode.
Main input fault relay; normally open. Closed when main input is in fault.
Main input fault relay center
Main input fault relay; normally closed. Open when main input is in fault.
J28
EPO-NO
J25
X2
EPO-NC
14
Single Module UPS Installation
2
+12V
X2
J25
EPO-H EPO-L