Liebert S3 Options User Manual

2          Introduction

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Power Supply*

Yes (if installed 

separately)

—

—

—

Remote Status Panel

No

—

—

Yes

Programmable Relay 
(2 boards max.)

Yes (one for each 

board installed)

1 connection

—

—

Input Contact Isolator
(w/ Power Supply) *

Yes

1 connection

—

Included on board

DC Ground Fault Alarm*

Yes

—

1 channel

—

SNMP (Ethernet or 
Token Ring)

Yes

1 connection

—

—

Internal Modem

Yes

1 connection

—

—

* These options require complete shutdown of the UPS system if installing or already installed. (See 1.1 - Opening the 
UPStation S3.) All other options can be installed while the UPS is on bypass.

Notes:
1.

You must install a mounting rack if an option you intend to install requires a mounting slot. The mounting rack has five 
mounting slots.

2.

If a DC Ground Fault Detector is installed, an Input Contact Isolator is also required. The Input Contact Isolator has eight 
input channels and a power supply.

3.

The SNMP (Ethernet or Token Ring) and Internal Modem options each use one logic connection. Two logic connections 
are available, therefore, some option combinations are not possible.

4.

Only one logic connection is required for any combination of one or two Programmable Relay boards and/or an Input 
Contact Isolator.

5.

Up to three Remote Status Panels can be connected to an UPStation S3. One Power Supply and a Programmable Relay 
option are required.

6.

Options requiring a Power Supply option can use the power supply mounted on the Input Contact Isolator option if one is 
installed.