EKE 1B Danfoss 080G5350 Superheat Controller

Product Overview

The 080G5350 (080G5350) is a precision-engineered Danfoss EKE 1B series superheat controller, specifically designed for managing electronic expansion valves in refrigeration and HVAC systems. In critical applications such as industrial chillers, food processing refrigeration, and advanced heat pumps, the EKE 1B acts as the localized intelligence for evaporator optimization. By processing high-speed signals from one pressure sensor and two temperature sensors, the unit maintains the ideal superheat setpoint, preventing liquid return to the compressor while maximizing heat transfer efficiency. Its integration into a system significantly reduces energy overhead and extends the lifecycle of primary cooling components.

Technical Configuration

The hardware profile of the 080G5350 is designed for DIN rail mounting, providing a compact footprint with high-speed processing capabilities.

• Sensor Interface: Supports a ratiometric pressure sensor (0.5 - 4 VDC) and dual temperature sensors for precise superheat calculation.

• Communication Protocols: Features a robust Modbus RS485 RTU interface for BMS integration, alongside an RJ11 (CAN) port for connection to a local User Interface (such as the MMIGRS2).

• Control Logic: Equipped with 2 Analog Inputs (Voltage), 2 Digital Inputs, and 1 Digital Output, allowing for comprehensive system interlocks and alarm signaling.

• Power Resilience: Operates on 24 VAC/VDC and includes a battery back-up range (18 - 24 VDC) to ensure the expansion valve can be driven to a safe position during a total power failure.

• Architecture: Utilizes a shared power supply and hardwired signal sharing to simplify cabinet wiring in multi-stage evaporator configurations.

Technical Specifications

Technical FAQs

How does the battery back-up function work on the EKE 1B?

The 080G5350 monitors the 24 V input. If power is lost, the controller utilizes the energy from the external battery back-up (18-24 VDC) to provide the necessary current to the stepper motor, forcing the expansion valve to a fully closed position to prevent liquid floodback.

Can I use the MMIGRS2 display with this controller?

Yes, while the EKE 1B does not have an onboard display, it is fully compatible with the MMIGRS2 interface via the RJ11 CAN port, allowing for easy parameter adjustment and real-time monitoring on-site.

Is the pressure sensor input compatible with 4-20 mA signals?

The standard input for the EKE 1B is ratiometric 0.5 to 4 VDC. If a 4-20 mA sensor is required, a signal converter or a different EKE variant must be used, as this model is hardware-optimized for voltage-based ratiometric sensors.

Engineering & Installation Guide

• Signal Integrity: Ensure that the sensor wires (Pressure and Temperature) are kept separate from high-voltage power lines. Use shielded cables for the Modbus RS485 communication to prevent electromagnetic interference (EMI) from VFDs or large contactors from corrupting the superheat calculation data.

• Grounding Protocol: When using the shared power supply feature, ensure that the common (GND) is properly referenced across all networked EKE units to avoid ground loops. Improper grounding can lead to ratiometric sensor drift, causing inaccurate valve positioning.

• Battery Maintenance: Periodically test the battery back-up circuit. In systems located in extreme cold or high-heat environments, battery capacity can degrade; ensuring a minimum of 18 VDC is available under load is critical for the "Safe Close" function of the electronic expansion valve.