Danfoss 080G5300 EKE 1A Superheat Controller

Product Overview

The 080G5300 (EKE 1A) is a high-performance superheat controller from the Danfoss EKE series, specifically engineered to manage electronic expansion valves (EEVs) with precision. By accurately calculating and maintaining optimal superheat levels, the 080G5300 protects compressors against liquid slugging and ensures maximum evaporator efficiency. This DIN-rail mounted controller is a critical component for chillers, heat pumps, and commercial refrigeration units. Its ability to share signals via hardwire and operate on a shared power supply makes it an exceptionally cost-effective and space-efficient solution for multi-circuit systems requiring reliable thermal management.

Technical Configuration

The EKE 1A is designed for seamless integration into advanced HVAC-R control architectures, focusing on input flexibility and communication.

• Sensing Capabilities: Supports a dual-input configuration specifically for superheat calculation, utilizing one ratiometric pressure sensor (0.5 to 4 V DC) and one temperature sensor.

• Control Interface: While the unit features no front display, it supports the MMIGRS2 external user interface via an RJ11 (CAN) communication port for local monitoring and parameter adjustment.

• I/O Logic: Equipped with 3 digital inputs and 1 digital output, allowing for remote start/stop functionality and alarm signaling to the main plant controller.

• Power Reliability: Operates on 24 V AC/DC and includes a battery back-up input (18 to 24 V DC), ensuring the expansion valve can be safely closed during a sudden power failure to protect the system.

• Installation Efficiency: Designed for standard DIN rail mounting, the compact 0.132 kg unit fits easily into dense electrical enclosures.

Technical Specifications

Technical FAQs

How does the EKE 1A protect the compressor during a power outage?

The 080G5300 features dedicated battery back-up terminals (18 - 24 V DC). In the event of a primary power loss, the controller utilizes the stored energy to drive the electronic expansion valve to a fully closed position, preventing refrigerant migration and liquid slugging upon restart.

Can I monitor the superheat value without a built-in display?

Yes. Although there is no front-facing display, the unit is fully compatible with the Danfoss MMIGRS2 remote display. By connecting it to the RJ11 (CAN) port, operators can perform real-time diagnostics, view active superheat levels, and adjust setpoints.

What is the "Shared Power Supply" feature mentioned in the documentation?

This indicates the controller is designed to operate on a common power bus with other EKE units or sensors. It simplifies cabinet wiring and reduces the number of individual power transformers required in multi-evaporator systems.

Engineering & Installation Guide

• Pressure Sensor Calibration: The 080G5300 is optimized for ratiometric pressure sensors with an output of 0.5 to 4 V DC. Ensure the sensor’s pressure range is correctly mapped in the controller parameters to avoid inaccurate superheat calculations that could lead to evaporator starvation or compressor flooding.

• Wiring for Battery Back-up: For mission-critical refrigeration, always connect a 24 V DC battery or UPS to the back-up terminals. Verify that the battery voltage remains within the 18 to 24 V DC window. Use a minimum of 0.75 mm2 wire for power connections to ensure sufficient current delivery during valve closure cycles.

• Signal Shielding: To maintain the integrity of the analog inputs from the temperature and pressure sensors, use shielded cables grounded at the controller side. This is vital in environments with high electromagnetic interference from nearby variable frequency drives (VFDs) or large contactors.