Installation Guide for Danfoss EKE 2U Back up Power Module

Quick guide from the manual

The Danfoss EKE 2U is an optional energy storage device designed to provide power to stepper controllers during a power failure, ensuring electronic valves can close safely. It is compatible with Danfoss EKE series and MCX controllers. Key operational aspects include the State of Health (SOH) function, which provides feedback on the module's status (Ready, Charging, Failed), and the Load Switch, which can be configured based on the number of valves connected.

Installation and Mounting

The EKE 2U module is designed for vertical mounting on a 35 mm DIN rail.

• Mounting: Snap the unit onto the DIN rail and secure it with a stopper to prevent sliding.
• Demounting: Gently pull the stirrup located at the base of the housing to release the unit from the rail.
• Environment: Ensure the device is installed inside an electrical panel with no live parts accessible. Avoid exposure to corrosive gases, high humidity (>90%), or strong vibrations.

Wiring and Connections

Proper wiring is critical for the module to function correctly.

• Power Supply: Use a class II category transformer for 24 V AC power supply.
• SOH Signal: Do not share the SOH signal between multiple controllers; connect it to only one EKE controller.
• Power Sharing: Power sharing is allowed between the EKE 2U and EKE SH controllers, provided the power supply is DC. A maximum of 2 EKE controllers can be connected to 1 EKE 2U.
• Cable Management: Keep power and battery backup cables separate from the SOH cable to avoid electromagnetic noise.
• Cable Length: Maximum cable length for power supply, backup output, and digital outputs is 5 meters.

Controller Configuration

To integrate the EKE 2U with EKE controllers, specific parameters must be set:

• Main Switch (R012): Ensure the main switch is OFF before changing settings.
• DI2 Configuration (O022): Set DI2 to 'PWR backup status' if the EKE 2U SOH is connected to DI2 of the controller.
• Battery Alarm (A034): Set to ON to receive alarms if the EKE 2U battery is low.
• Monitoring: Use parameter U101 to read actual battery voltage and U115 to read power backup status.

Technical Specifications

• Input Voltage: 24 V DC / 24 V AC (Range: 20-40 V DC, 19-29 V AC).
• Ambient Temperature: -25 °C to +60 °C.
• Protection Degree: IP 20.
• Charging Time: Approximately 2.5 minutes from a fully discharged state.
• Lifespan: >90,000 hours at 35 °C.

Safety and Warnings

This device contains live electrical components and must be installed by qualified personnel. The device must not be used as a safety device. Always disconnect the power supply before performing maintenance or working on electrical connections. Connecting output signals to mains voltage will permanently damage the controller.