Electrical Connections

2.3.4Output Dry Contacts

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

Figure 10 Output dry contacts and EPO wiring for firmware before M170

+12V

X1

J13

 

 

J21

 

 

 

 

 

BFP C

BFP S

BFP O

INV C

INV S

INV O

Table 4 Output dry contact relays

 

J25

 

ACF C

ACF S

ACF O

J28

EPO-H EPO-L

X2

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. 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 for maximum runs between 82 and 164 feet (25-50m), respectively.

2.3.5EPO Input—Optional

Firmware Before M200

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.

Table 5 EPO input contact relays

Position

Name

Description

 

 

 

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 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.

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Emerson 10-30kVA Output Dry Contacts, EPO Input-Optional Firmware Before M200, Output dry contact relays

10-30kVA specifications

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