Eaton STS 2000A - 6.2 Ethernet Connection; 6.3 Dry Contact Signals; 6.3.1 Dry Contact Output Signals; 6.3.2 Dry Contact Input Signals

32 Eaton Static Transfer Switch 2000A 3-Pole Installation and Operation Manual 164001127—Rev 01
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The Monitor PCB has an Ethernet port and cable. The Ethernet cable hangs down from the Monitor with a an
RJ45 jack connection that is close to the Contractor Board.
Use the Settings screen to set Ethernet parameters (11.2 Ethernet). The Ethernet connection allows you to
run TCP/IP, Modbus TCP/IP, HTTP for the web server, SNMP, SNTP for time synchronization, and SMTP for
email summary alarm alerts. Chapter 11 System Setup: Networking describes configuration for these options.
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Contractor Board remote relays signal status and alarms through closed dry contacts, shown in Table 1. There
are three predefined relay lists. Remote relays can be customized during setup to turn on for other points in the
STS points list.
Table 1. Output Dry Contact Signals, Remote Relays
Remote Relays
Basic Contractor Board
(Default List)
Enhanced Contractor Board
List 1 List 2
Relay 1 Summary Alarm Summary Alarm Summary Alarm
Relay 2 Load is on Source 1 Load is on Source 1 Load is on Source 1
Relay 3 Load is on Source 2 Load is on Source 2 Load is on Source 2
Relay 4 Output is OK Source 1 is on Bypass Source 1 is on Bypass
Relay 5 Not Available Source 2 is on Bypass Source 2 is on Bypass
Relay 6 Not Available Source 1 is Available STS cannot switch
Relay 7 Not Available
Source 2 is Available Auto Retransfer is inhibited
Relay 8 Not Available Output is OK STS is on the Alternate Source
(not the Preferred Source)
NOTE: Closed dry contacts signal the conditions shown in this table.
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Table 2 lists dry contact signals to the STS from an external source, such as the BMS.
• Remote EPO shuts down the STS.
• Remote Select S1 or Remote Select S2 causes the STS to switch to that designated source.
• Building Alarm 1-8 are input signals for various building sensors, such as fire, temperature, cooling failure,
or under floor water. The name of the Building Alarm is specified in the points list. A building alarm causes
a point to be activated in the points list, but causes no other action.
Customer Communications Connections