Emerson Liebert APS Installation Manual download pdf (Page 20)

12 Chapter 1 Installation

Liebert APM Modular UPS User & Installation Manual

1.7.4 Output Dry Contact Port

J5 is the output dry contact port, providing two relay output dry contact signals. The port is shown in Figure 1-12 and

described in Table 1-8.

BFP_C

BFP_S

BFP_O

Figure 1-12 Output dry contact port

Table 1-8 Description of output dry contact port

Position Name Description

J5.2 BFP_O

Bypass feedback protection relay (normally open), closed when bypass

silicon-controlled rectifier (SCR) is shorted

J5.3 BFP_S Bypass feedback protection relay common

J5.4 BFP_C Bypass feedback protection relay (normally closed), open when bypass SCR is shorted

1.7.5 Remote EPO Input Port

The UPS has an Emergency Power Off (EPO) function that can be operated by pressing a button 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 1-13 and described in Table 1-9.

J10

+12V

EPO NO

+12V

EPO NC

Figure 1-13 Remote EPO input port

Table 1-9 Description of remote EPO input port

Position 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 breaker when EPO is activated.

2. Pins 1 and 2 of J10 are shorted as default setting of UPS.

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Emerson Liebert APS Installation Manual Page 20