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 Connection – 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 marked +24v and EPO for EPO circuit. The return position enables a light for the
remote EPO button.
Customer Communications Connections
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