Emerson E2 - Manual (Page 35)

Echelon Network Boards and Peripherals Hardware Overview • 2 - 11
2.3 Echelon Network
Boards and Peripherals
2.3.1 The 16AIe (Discontinued)
The 16AIe (P/N 810-4000) is an Echelon-based input
board similar in function to its I/O Network counterpart,
the MultiFlex 16 (see Section 2.2.2). The 16AIe receives
input signals through any of 16 two-wire connections. The
board receives either digital or analog data from sensors
wired to any of the 16 input connections located on the
board.
This board has been discontinued and is no longer
available for sale.
2.3.2 The 8ROe (Discontinued)
The 8ROe (P/N 810-4010) is an Echelon-based input
board similar in function to its I/O Network counterpart,
the 8RO. The 8ROe board is the direct link between the E2
and component operation. Information gathered by the
controller from the input boards is checked against current
stored setpoints. If differences in the received input data
and the setpoint information are detected, a signal is either
sent to the proper 8ROe relay, or an existing signal is dis-
continued. Through the use of this relay signal, control
functions that can be properly maintained by a simple con-
tact closure sequence are effectively operated by the E2.
The 8ROe features Form C contacts for wiring outputs
as either normally open or normally closed. Fail-safe dip
switches on the 8ROe allow the installation technician to
specify the desired state of each relay in case of communi-
cations loss.
This board has been discontinued and is no longer
available for sale.
2.3.3 EC-2s
The EC-2 is an advanced refrigerated case controller
that doubles as a temperature and case status indicator.
During refrigeration and defrost, the EC-2 controls most
typical case functions, including fans, defrost, and a pulse
valve on the liquid side of the evaporator to regulate super-
heat.
The EC-2 29x version controls the refrigeration sole-
noid valve to allow the passage of refrigerant to the TXV
valve. The EC-2 39x version controls a pulse valve on the
liquid side of the evaporator to regulate Superheat control.
The EC-2 relies on a parent E2 to handle logging,
alarm control, defrost scheduling, and other case control
functions.
The EC-2 is designed to be mounted on the front of a
refrigerated case. The LED display shows the current case
temperature with one-tenths of a degree's accuracy. The
display can also show alarm codes to immediately notify
Figure 2-17 - 16AIe
Figure 2-18 - 8ROe
Figure 2-19 - EC-2