Emerson operation manual Powering the E2

4.1.3Main Processor Board (Pre- vious Version)

Figure 4-3- E2 Main Board (Previous Version P/N 237-4800)

4.1.4Power Interface Board

Figure 4-4- Power Interface Board

The PIB interfaces the power and most all communica- tions with the main board, and contains all field wiring connections.

4.2Powering the E2

Starting at the lower right side of the PIB, the first plug is the 24VAC input. This must terminate into the power supply transformer.

E2 requires 24VAC Class 2 power, which is supplied by a non-center-tapped Class 2 transformer.

Retail Solutions supplies two transformers that may be used to power E2s: one for use with 110VAC (P/N 640- 0041), and one for use with 220VAC (P/N 640-0042). Both transformers are rated at 50VA, and each will power one E2 unit.

4.2.1RS485 Ports

On the lower left side of the PIB are two RS485 Net- work connector ports. This is where all I/O boards (except the case controllers, TD3, ESR8, and Echelon I/O boards) are connected.

4.2.2RS485 Jumpers

There is one set of RS485 jumpers for each RS485 port. Jumpers JP1-3 are located directly above the first connector port, and jumpers JP4-6 are located directly above the second connector port. The RS485 termination jumpers (JP1, JP2, JP3, JP4, JP5, and JP6) are used to ter- minate the devices at the beginning and end of an RS485 Network. If the E2 is the beginning of all RS485

I/O Networks, all three of these jumpers should be set to the UP position.

4.2.3Echelon Network Connect

The next connector is the Echelon Network plug. The one connector handles both input and output connections. The input and output cables are connected directly to the Echelon plug. This plug is the connection to the Case Con- troller (CC-100), the Evaporator Stepper Regulator board (ESR8), TD3s, and other E2s.

4.2.4Echelon Jumpers

The two Echelon jumpers (JP7 and JP8) are located next to the Echelon Network port.

Additional information about Echelon Networking and terminating the network can be found in Section 8.3, Ech- elon Network Structuring (Daisy-Chains).

4-2 • E2 RX/BX/CX I&O Manual 026-1610 Rev 13 14-SEP-2011