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.

2.1	E2 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
		Figure 2-1- E2 Front Panel
	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.

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 90°F
Humidity
Storage	5% - 100% RH
Humidity
Power	24 VAC ±20%, 50/60 Hz, Class 2
VA Load	50

Table 2-1- E2 Specifications

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

E2 Hardware Hardware Overview • 2-1