Emerson 10-30kVA Manuel D’Utilisation

There are three output dry contact relays at the X1 slot (see Figure 10 and Table 4).

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 10, is the remote EPO input interface. It is active when shorted from 

EPO-L to EPO-H.
If an external Emergency Stop facility is required, it is connected terminals EPO-L to EPO-H of the 

auxiliary terminal block (X2). It also is connected to the Normally Open remote stop switch between 

these two terminals using shielded cable (see Figure 10 and Table 5). If this function is not used, 

terminals EPO-L to EPO-H must be opened. 

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. Open 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 20-16AWG stranded 

J28.2

EPO_L

Emergency Power Off Low

J28.4

EPO_H

Emergency Power Off High

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