Specifications

Liebert Static Transfer Switch
10 Guide Specification
An audible alarm shall be activated when any of the alarms occurs. All alarms shall be displayed in text
form.
2.3 ACCESSORIES (OPTIONAL COMPONENTS AND SERVICES)
2.3.1 Programmable Relay Board
A Programmable Relay Board with eight sets of isolated Form C contacts shall be provided to indicate a
change of status of any of the alarm conditions. Any alarm can be programmed onto any channel or
channels. Up to two Programmable Relay boards can be installed in the STS2. Programming is performed
through the Touch-screen display. Each contact shall be rated 1 Amp @ 30 VDC or 250mAmp @ 125
VAC.
2.3.2 Input Contact Isolator Board
A Input Contact Isolator Board with eight relay inputs (normally open dry contacts) shall be provided for
owner alarm messages. The owner through the touch-screen display can program the alarm messages.
2.3.3 Comms Board
The STS shall be provided with a Comms Board that can communicate with a Liebert SiteScan
monitoring system and/or an external modem.
The STS shall be equipped with an RS-422 communication port for communication to a Liebert SiteScan
monitoring system using a 2-wire twisted pair for reliable communication up to 1000 meters (3281 feet).
Information available from the RS-422 port shall include the present switch status information, all
monitoring parameters, and all active alarms.
The STS shall be equipped with a modem interface for remote reporting of the present switch status
information, alarm history information, and the history of status screens that are triggered upon a major
alarm event. The monitoring system software shall also support an auto-dial feature that allows the system
to automatically dial programmed phone numbers by way of the modem to report designated alarm
conditions. (External modem is supplied by others)
2.3.4 Comms Board with Internal Modem
The STS shall be provided with a Comms Board that can communicate with a Liebert SiteScan
monitoring system and/or an internal modem.
The STS shall be equipped with an RS-422 communication port for communication to a Liebert SiteScan
monitoring system using a 2-wire twisted pair for reliable communication up to 1000 meters (3281 feet).
Information available from the RS-422 port shall include the present switch status information, all
monitoring parameters, and all active alarms.
The STS shall have an internal modem capable of dialing out from the STS to notify up to two remote
computers, terminals, PC’s, or pocket pagers when important events occur. The modem will also be
capable of accepting incoming calls, with the appropriate security, and connecting to a remote terminal,
computer or PC, to perform all those functions normally available on the front panel including viewing
monitoring screens.
2.3.5 Network Interface Card (NIC)
STS shall have an OpenComms Network card, which enables the STS to communicate to a network
management system (NMS). The Network Interface Card (NIC) will include internal hardware and