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E2 Hardware Hardware Overview • 2-1
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
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
Temp
-40°F to 149°F (-40°C to 65°C)
Storage Temp
-40°F to 158°F (-40°C to 70°C)
Operating
Humidity
5% - 95% RH non-condensing at 90°F
Storage
Humidity
5% - 100% RH
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.