EC2-391 Display Case and Coldroom Controller

Operating Instructions

GB

Note: This document contains short form instructions for experienced users. Use last column in List of Parameters to document your individual settings. More detailed information can be found in the User Manual.

The EC2-391 is a dedicated refrigeration controller with superheat and a driver for an Alco Controls Electric Control Valve EX2. In addition the EC2-391 controls air temperature and manages defrost and fan(s).

Two ECN-Pxx pipe temperature sensors (1) and (2) measure suction gas temperatures at the evaporator inlet / outlet and feed the signals into the superheat control loop. The superheat controller output modulates the opening of the EX2 pulse width modulated Electrical Control Valve (6) thus optimising the refrigerant mass flow through the evaporator. The air temperature sensors (3) and (4) measure air-in and out temperature of the evaporator and feed signals into the air temperature thermostat. The ECN-Fxx fin sensor (5) is used for defrost termination. The controller has 3 relay outputs to control the defrost heater (9), the evaporator fan (8) and an optional output (7). Please consult the technical data (right) for input and output ratings.

In case of power loss, due to the positive shut-off characteristics of the EX2 Electrical Control Valves, a liquid line solenoid valve is not needed to prevent flooding of the compressor.

!Safety instructions:

Read installation instructions thoroughly. Failure to comply can result in device failure, system damage or personal injury.

The product is intended for use by persons having the appropriate knowledge and skills.

Ensure electrical ratings per technical data are not exceeded.

Disconnect all voltages from system before installation.

Keep temperatures within nominal limits.

Comply with local electrical regulations when wiring

Technical Data

EC2 Series Controller

Power supply

 

24VAC ±10%; 50/60Hz; Class II

Power consumption

 

20VA max including EX2

Communication

 

LonWorks® Interface, FTT10, RJ45 connector

Plug-in connector size

 

Removable screw terminals

 

 

wire size 0.14 … 1.5mm2

Temperature

 

 

storage

 

-20 … +65°C

operating

 

0 … +60°C

Humidity

 

0…80% r.h. non condensing

Protection class

 

IP65 (front protection with gasket)

Pressure transmitter input

24VDC, 4...20mA

Output relays

(3)

SPDT contacts, AgCdO

 

 

Inductive (AC15) 250V/2A

 

 

Resistive (AC1) 250V/8A; 12A total return current

Triac output for EX2

 

24V AC, 0.1 … 1A

Electrical Control Valve

 

Coil (ASC 24V only)

 

 

Marking

 

 

 

 

 

Mounting

The EC2-391 can be mounted in panels with a 71 x 29 mm cutout. See dimensional drawing below for space requirements including rear connectors.

Push controller into panel cutout.(1)

Make sure that mounting lugs are flush with outside of controller housing

Insert allen key into front panel holes and turn clockwise. Mounting lugs will turn and gradually move towards panel (2)

Turn allen key until mounting lug barely touches panel. Then move other mounting lug to the same position (3)

Tighten both sides very carefully until controller is secured. Do not over tighten as mounting lugs will break easily.

Electrical Installation

Refer to the electrical wiring diagram (below) for electrical connections. A copy of this diagram is labeled on the controller. Use connection wires/cables suitable for 90°C operation (EN 60730-1).

EC2 analog inputs are for dedicated sensors only and should not be connected to any other devices. Important: Keep controller and sensor wiring well separated from mains wiring. Minimum recommended distance 30mm.

Warning: Use a class II category transformer for 24VAC power supply (EN 60742). Do not ground the 24VAC lines. We recommend to use one transformer per EC2 controller and to use separate transformers for 3rd party controllers, to avoid possible interference or grounding problems in the power supply. Connecting any EC2 inputs to mains voltage will permanently damage the EC2.

EC2-391_65136_EN_R01.doc

Replacement for 00

1 / 4

PCN: 865 022

21.09.2007

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Emerson EC2-391 user manual Safety instructions, Technical Data, Mounting, Electrical Installation, EC2 Series Controller

EC2-391 specifications

The Emerson EC2-391 is a sophisticated and versatile control solution designed to meet the demands of modern automation and process control environments. Boasting a robust architecture, this controller is suitable for various industrial applications, including manufacturing, petrochemicals, and utilities.

One of the main features of the Emerson EC2-391 is its modular design, allowing for easy scalability and flexibility. Users can configure the system according to their specific needs by adding or removing modules. This modularity accommodates a wide range of I/O options, ensuring compatibility with diverse field devices and integration into existing systems.

Another significant characteristic is the controller's high processing power. The EC2-391 utilizes advanced processing technology that enables real-time data handling and fast decision-making. This performance is crucial for systems requiring rapid response times, such as safety-critical operations and complex process environments.

The EC2-391 is equipped with sophisticated communication protocols, such as Modbus, EtherNet/IP, and others, ensuring seamless integration with various networks and devices. This makes it easier to establish connectivity within industrial ecosystems, facilitating data exchange between different systems and improving overall operational efficiency.

In addition to strong communication capabilities, the Emerson EC2-391 features advanced diagnostic functions. These functionalities allow for continuous monitoring of system performance, identifying potential issues before they escalate into failures. Operators benefit from enhanced visibility into their processes, enabling proactive maintenance strategies and reducing downtime.

Another noteworthy technology in the EC2-391 is its user-friendly interface. The controller supports intuitive setup and configuration, which simplifies the deployment process. The interface provides easy access to system parameters, trends, and alerts, aiding operators in effective management and optimization of processes.

Security is a critical focus in modern industrial control systems, and the Emerson EC2-391 incorporates various security features. These include user authentication, encrypted communication, and access control measures that safeguard against unauthorized access and cyber threats.

In summary, the Emerson EC2-391 is an advanced control solution characterized by modularity, high processing power, robust communication capabilities, advanced diagnostics, user-friendly interface, and strong security features. Its ability to adapt to various industrial applications makes it a formidable choice for companies seeking to enhance their automation strategies and improve operational efficiency.