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Danfoss EKC 202B

Danfoss EKC 202B
20 pages
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Controller for temperature control
- EKC 202A,B,C and EKC 302A,B
Manual

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Danfoss EKC 202B Specifications

General IconGeneral
Supply voltage24 V AC/DC
Digital inputs2
Analogue inputs1
Number of relays2
Relay OutputSPDT
CommunicationModbus RTU
Protection classClass II
Storage temperature range-20°C to 60°C
Relay contact rating250 V AC
DisplayLED
Enclosure ratingIP65 (front)
Relative humidity20 to 80% RH, non-condensing
MountingDIN rail
Power consumptionMax 4 VA

Summary

Introduction

Application

Details the controller's use in refrigeration and cold rooms, including defrost, fans, alarm, and light control.

Principle

Explains how the controller manages temperature and defrost cycles based on sensor input and relay outputs.

Advantages

Lists benefits like integrated functions, IP65 density, digital input options, and programming key compatibility.

Controller Models and Features

EKC 202 A EKC 302 A

Controller with two relay outputs, two temp sensors, and digital input for temp control, defrost, and alarm.

EKC 202 B EKC 302 B

Controller with three relay outputs, two temp sensors, and digital input for temp, defrost, and fan control.

EKC 202 C

Controller with four relay outputs, two temp sensors, and digital input for temp, defrost, fan, and alarm/light control.

Defrost Start Methods

Digital Input Functions

Lists functions for the digital input, including door contact, defrost start, regulation control, night operation, and case cleaning.

Case Cleaning Process

Explains a three-step process to steer the appliance through a cleaning phase, stopping and restarting refrigeration/fans.

Defrost on Demand

Describes two methods for initiating defrost: based on aggregate refrigeration time or S5 temperature variation.

Controller Operation

Display and LEDs

Explains the three-digit display and temperature unit settings (°C or °F), and the function of front panel LEDs.

Defrost Indication

Details the display indication (-d-) during defrost and conditions for its discontinuation.

Button Navigation

Explains how to navigate menus and change settings using the buttons on the front panel.

Start-up Procedures

Controller Functions

Normal Display and Thermostat Settings

Describes the normal display of temperature values from the Sair sensor and thermostat control settings.

Set Point and Temperature Adjustments

Details settings for set point limitation, temperature unit, and display correction.

Signal Correction and Night Setback

Explains Sair signal correction, start/stop of refrigeration, and night setback value settings.

Alarms and Compressor Control

Alarm Delays and Limits

Sets alarm delays for temperature and door alarms, and defines high/low temperature limits.

Condenser Temperature Alarm

Sets the activation point for condenser temperature alarms using the S5 sensor.

Compressor Running Times

Sets minimum ON and OFF times for the compressor to prevent irregular operation.

Defrost Control Parameters

Defrost Method and Stop Conditions

Selects defrost method (none, electric, gas) and sets the stop temperature.

Defrost Duration and Interval Settings

Defines defrost interval, maximum duration, and time staggering for defrost cut-ins.

Fan Control During Defrost

Configures fan operation (stopped or running) during defrost cycles and sets fan start delays.

Defrost Initiation and Fan Operation

Defrost On Demand

Initiates defrost based on aggregate refrigeration time or S5 temperature variation.

Fan Stop and Delay Settings

Configures fan stop at compressor cutout, delay of fan stop, and fan stop temperature.

Real-Time Clock

Manages the real-time clock for defrost scheduling and general timekeeping.

Miscellaneous Settings

Digital Input Configuration

Lists functions for the digital input, including status display, door functions, defrost start, and main switch.

Network Address and Access Codes

Sets controller address for networks and configures access codes for settings and adjustments.

Sensor, Display, and Light Configuration

Selects sensor type, display step, and configures the light relay function.

Settings Management and Sensor Applications

Copying Controller Settings

Transfers controller settings to a programming key or loads them from a key.

S5 Sensor and Relay 4 Applications

Defines the application of the S5 sensor and configures the function of relay 4.

Service Information

Provides access to service-related data like sensor temperatures and relay statuses.

Fault and Alarm Messages

Fault Message Identification

Lists fault messages, their types (A-alarms, E-alarms), and conditions for visibility.

Alarm Code Descriptions

Provides descriptions for various alarm codes, including temperature, door, and DI input alarms.

Alarm Destination Settings

Defines the importance or destination settings for individual alarms.

Override Functions

Defrost Override Control

Describes how defrost can be initiated via data communication or time schedule.

Coordinated Defrost and Night Setback

Explains how defrost control and time schedules are used for coordinated defrost and night setback.

Light Control Override

Details how day/night control and time schedules manage the light function.

Connections and Wiring

Power Supply and Sensor Connections

Specifies the required power supply voltage and details sensor connections.

Digital Input and Relay Signals

Explains digital input functions and outlines general relay connections for various functions.

Electric Noise Mitigation

Provides guidelines for managing electric noise by separating sensor and communication cables.

Data Communication Setup

Product Ordering Information

Technical Data and Specifications

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