Emerson 40-200KVA Mode D'Emploi

Electrical Connections

3.3.5 EPO Input—Optional

The UPS has an Emergency Power Off (EPO) function operated by a button on the control panel or by

a remote contact provided by the user. The local EPO button is under a hinged, clear plastic shield.
The X2 slot, shown in Figure 8, is the remote EPO input interface. The EPO has a 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 and 2 or X2: 3 and 4

of the auxiliary terminal block (X2). It also is connected to the Normally Open or Normally Closed

remote stop switch between these two terminals using shielded cable (see Figure 8 and Table 5). If

this function is not used, terminals X2: 3 and 4 must be opened and X2: 1 and 2 must be closed.

Figure 8

EPO wiring

Table 5

EPO input contact relays

Position

Name

Description

J28.1

EPO_NC

EPO Activated when opened to J28.2

J28.2

EPO_NC

EPO Activated when opened to J28.1

J28.3

EPO_NO

EPO Activated when shorted to J28.4

J28.4

EPO_NO

EPO Activated when shorted to J28.3

NOTE
The Emergency Stop action within the UPS shuts down the rectifier, inverter and static

bypass. It does not internally disconnect the input power supply. To disconnect ALL power to

the UPS, open the upstream feeder breaker(s) when the remote EPO is activated.

NOTE
Normally Closed EPO – X2: 1,2, these terminals are supplied factory-linked on the monitor

board and must remain installed if using NO contacts.

NOTE
All auxiliary cables of terminal must be double-insulated. The wire must be 600V, 18-16 AWG

stranded for maximum runs between 82 and 197 feet (25-60m), respectively.

EPO - NO

EPO - NC

J28

NOTE: The black square

indicates Pin 1.