Emerson E2 operation manual 16AIe Dis, 8ROe Dis

2.3Echelon Network Boards and Peripherals

2.3.1The 16AIe (Discontinued)

Figure 2-17 - 16AIe

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.

2.3.2The 8ROe (Discontinued)

Figure 2-18 - 8ROe

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
Figure 2-19 - EC-2

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

Echelon Network Boards and Peripherals Hardware Overview • 2-11