Eaton STS 2000A, Installation And Operation Manual

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30 Eaton Static Transfer Switch 2000A 3-Pole Installation and Operation Manual 164001127—Rev 01
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Figure 11. Figure 11 Basic Contractor Board
The Basic Contractor Board connections ( Figure 11 ) are as follows:
Dry Contact Remote Relays: Programmable NO or NC dry contacts for external output of specific internal
alarms or status:
1. Relay 1 : Summary Alarm – signals when there is any active alarm on the STS.
2. Other Relays :
Relay 2 : Load on S1
Relay 3 : Load on S2
Relay 4 : Output OK
NOTE Remote relays can accept dry contacts rated up to 2A/250V.
3. ModBus Connectio n – 4 wire configuration connection
4. Building Alarms – Input terminal block to provide unit with input on four (4) external building alarms
5. Remote EPO – Connection point for input of remote EPO signal to system. This is a dry contact
connection point. Connection of voltage to this point can cause damage to the unit. Connect external dry
contacts to terminals 24v and EPO for EPO circuit. The return position enables a light for the
remote EPO button.
Customer Communications Connections