Emerson 208V, 10-30kVA 2.3.4Output Dry Contacts, 2.3.5EPO Input-Optional Firmware Before M200

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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