Emerson operation manual Hardware Overview, E2 Hardware

2 Hardware Overview

This section gives an overview of the E2, the hard- ware, and how it communicates across the I/O and Eche- lon Networks to control an entire system.

2.1E2 Hardware

The E2 controller is programmed to monitor and com- mand all aspects of a refrigeration or building environ- mental control system. The E2 uses both an RS485 I/O Network and a LonWorks Network to gather data from input devices, communicate with other E2s, and activate or deactivate loads.

In general, an E2 control network will consist of the following components:

1.E2 - The “brain” of the control network, which performs all necessary computations and sends commands to the output devices that control the system.

2.Input Boards - Transfer readings to the E2.

3.Output Boards - Banks of relays, digital pulse outputs, or analog outputs, which the E2 may use to control loads.

4.Smart Boards - Boards such as case controllers (for refrigeration) or rooftop controllers (for building control) that perform control functions for an individual case or rooftop unit, and send the data to the E2 for logging and alarm purposes.

5.Modem - For remote communication via phone, if necessary.

6.Network Wiring - Wiring that connects the E2 to other E2s, and all the input, output, and smart boards.

7.Sensors and Loads - The “eyes” and “hands” of the control network. Sensors “see” what needs to be controlled on the network, and Loads are what can be controlled, or more specifically, be turned on and off, such as compressors, condensers, lights, and fans.

Figure 2-1- E2 Front Panel

Dimensions	Standard Mount:
	9.06” W x 12.06” H x 3.75” D
	Recessed Mount:
	9.06” W x 10.56” H x 2.0” D
	Base:
	10.56” W x 10.56” H x 3.75” D
Operating	-40°F to 149°F (-40°C to 65°C)
Temp
Storage Temp	-40°F to 158°F (-40°C to 70°C)
Operating	5% - 95% RH non-condensing at
Humidity	90°F
Storage	5% - 100% RH
Humidity
Power	24 VAC ±20%, 50/60 Hz, Class 2
VA Load	50

Table 2-1- E2 Specifications

NOTE: Contact Emerson Emerson Retail Solutions Customer Service at 770-425-2724 for E2 controller part numbers and model de-

scriptions.

E2 Hardware Hardware Overview • 2-1