Emerson Liebert APM 90 - 3.2.6 Remote EPO Input Port

24 Chapter 3 Electrical Installation
Liebert APM 90 Integrated Modular UPS User Manual
Table 3-6 Description of output dry contact port
Port Name Description
J5.2 BFP_O Bypass feedback protection relay (normally open), closed when bypass SCR is shorted
J5.3 BFP_S Bypass feedback protection relay center
J5.4 BFP_C Bypass feedback protection relay (normally closed), open when bypass SCR is shorted
3.2.6 Remote EPO Input Port
The UPS has the EPO function that operates by a switch on the operator control and display panel of the UPS or
by a remote contact provided by the user. The EPO switch is under a hinged, plastic shield.
J10 is the remote EPO input port. The port is shown in Figure 3-12 and described in Table 3-7.
J10
EPO-NO
+12V +12V
+12V
EPO-NC
Figure 3-12 Remote EPO input port
Table 3-7 Description of remote EPO input port
Port Name Description
J10.1 EPO_NC EPO activated when shorted to J10.2
J10.2 +12V EPO activated when shorted to J10.1
J10.3 +12V EPO activated when opened to J10.4
J10.4 EPO_NO EPO activated when opened to J10.3
EPO is triggered when pins 3 and 4 of J10 are shorted or pins 2 and 1 of J10 are opened.
If an external EPO facility is required, pins 1 and 2 or 3 and 4 of J10 are reserved for this function. The external
EPO facility is also connected to the normally open or normally closed remote stop switch between these two
terminals using shielded cable. If this function is not used, pins 3 and 4 of J10 must be opened or pins 1 and 2
of J10 must be shorted.
Note
1. The UPS EPO action shuts down the rectifiers, inverters and static bypass. But it does not internally disconnect the
input power supply. To disconnect all power to the UPS, open the upstream input switch when EPO is activated.
2. Pins 1 and 2 of J10 are supplied factory-shorted.
3.2.7 RS485 Port, RS232 Port And Intellislot Port
The RS485 and RS232 ports provide serial data and are intended for use by authorized commissioning and
service personnel in UPS commissioning and service.
The three Intellislot ports are used to install optional communication cards at site, including relay card,
Modbus card, SIC card and UF-RS485 card. For details, refer to Chapter 8 Option.