Danfoss EKC 315A User Manual

User Guide
Superheat controller
EKC 315A
DKRCI.PS.RP0.D2.02 | 520H7653 | 1
© Danfoss | DCS (ADAP-KOOL®) |2015-03
Advantages • The evaporator is charged optimally – even
when there are great variations of load and
suction pressure.
• Energy savings – the adaptive regulation of
the refrigerant injection ensures optimum
utilisation of the evaporator and hence a high
suction pressure.
• Exact temperature control – the combination
of adaptive evaporator and temperature
control ensures great temperature accuracy for
the media.
• The superheating is regulated to the lowest
possible value at the same time as the media
temperature is controlled by the thermostat
function.
The controller and valve can be used where
there are requirements to accurate control
of superheat and temperature in connection
with refrigeration.
E.g.:
• Cold store (air coolers)
• Processing plant (water chillers)
• A/C plant

Danfoss EKC 315A Specifications

General

Power Supply	24 V AC/DC
Communication Protocol	Modbus RTU
Approvals	CE, UL
Enclosure Rating	IP20
Digital input	1
Output Type	Relay
Sensor inputs	3 sensor inputs

Summary

Advantages

Optimal Evaporator Charging

Ensures optimal evaporator charging even with varying load and suction pressure.

Energy Savings

Adaptive regulation optimizes evaporator use, leading to higher suction pressure and energy savings.

Precise Temperature Control

Combines adaptive evaporator and temperature control for accurate media temperature.

Optimized Superheat Regulation

Regulates superheat to the lowest possible value while controlling media temperature.

Introduction

Key Functions

Lists the primary functions of the superheat controller EKC 315A.

System Overview

Describes the system components and valve types used with the controller.

Operation Modes

Superheat Control

Explains the two types of superheat control: adaptive and load-defined.

MOP and Override Functions

Details MOP function, override, external start/stop, and relays.

Valve Operation and Output

Discusses modulating/pulsating valves, analog output, and PC operation.

Function Survey

Display and Reference Settings

Covers normal display options, set point, differential, units, and external contribution.

Alarm Configuration

Explains how the controller provides alarms for deviations and delay.

Control Parameter Configuration

PID Regulation Parameters

Defines Kp, Tn, Td, and stability factors for PID control.

Superheat Reference Settings

Sets max/min superheat references, MOP, and superheat regulation types.

Valve and Temperature Settings

Configures standby temperatures for TQ valves and max/min opening degrees.

Miscellaneous Settings

Communication and Addressing

Covers controller address and data communication setup.

Signal and Output Configuration

Defines valve/output signals, input signals, display, and analog outputs.

Input/Output and Transmitter Settings

Details manual output control, pressure transmitter range, and AO min/max values.

Service and Status Information

Service Data Readings

Lists various parameters that can be read for service, e.g., temperatures, pressures, superheat.

Status and Alarm Information

Explains how to view operating status codes and alarm relay status.

Menu Navigation and Parameters

Parameter Survey Overview

Summarizes key parameters for display, reference, alarm, and regulation.

User Interaction and Operations

Explains button functions and provides examples for setting parameters.

System Configuration and Settings

Analog Input and Signal Definition

Configures the function and signal range for the analog input AIA.

Controller Messages and Parameters

Covers controller messages, frequency, display, manual control, and pressure transmitter ranges.

Refrigerant and Service Setup

Details refrigerant selection and service parameter access.

Technical Data and Connections

Product Specifications (Data)

Details supply voltage, power, signals, actuators, and environmental specs.

Ordering Information

Lists product types, functions, and code numbers for ordering.

Electrical Connections

Shows necessary and application-dependent terminal connections.

Installation and Appendices

Installation Considerations

Highlights potential issues and best practices for installation to prevent malfunctions.

Appendix 1: Start/Stop Interactions

Explains interactions between internal/external start/stop functions and active controller functions.

Appendix 2 & 3: Actuator Cables and Slave Modules

Covers TQ actuator cable length and using EKC controllers as slave modules.

Appendices on Valve Operation

Appendix 5: TQ Valve Standby Temperatures

Explains standby temperature settings for TQ valve actuators.

Appendix 6: Superheat Regulation Types

Details adaptive superheat and load-defined superheat regulation methods.

Controller Startup and Tuning

Controller Start-up Procedure

Outlines the steps required to start the controller regulation.

Troubleshooting Fluctuations and Underswing

Provides guidance on adjusting parameters for fluctuating superheat and start-up underswing.