Fujitsu General Australia

Part Number: 325739

Overview

The NBC24V1BLCWMN is a compact battery charger module designed to manage and charge a 24V / 7.2Ah lead-acid battery or two 12V / 7.2Ah batteries connected in series.
This system provides backup power for control electronics—particularly superheat drivers (Danfoss EKE1D / EKE1C)—in the event of a mains supply failure.

Functional Description

The charger ensures stable 27V DC output for maintaining charge and automatic float-mode operation once full capacity is reached.

Key Electrical Specifications

Typical Application

• Chiller and rooftop units using Danfoss EXD316 and EKE1D/EKE1C drivers

• Elevator rescue systems

• Industrial backup and communication modules

⚠ Important:
If an EKE1D or EKE1C Superheat Driver fails, verify the battery charger output first before installing a replacement driver.
A failed or undercharged battery module can cause false driver fault codes or improper valve control.

Installation Procedure (Summary)

From the Battery Installation Instruction – G.I. Industrial Holding SPA

Battery_Installation_Instructio…

1. Check the Battery Condition

   • Ensure batteries are physically intact and terminals are clean.

2. Mount Components

   • Install the charger on the DIN rail within the electrical cabinet.

   • Secure the new battery near the existing battery pack.

3. Wiring

   • Disconnect the original battery wiring.

   • Connect in series with the supplied bridge harness to achieve 24VDC (observe polarity).

   • Connect the charger in parallel across the full battery pack (see wiring diagram on page 3 of the manual).

   • Female fastons connect to the battery; male fastons connect to the EXD316 driver harness.

4. Electrical Connection

   • Power the charger using 230 VAC supply (L, N, and Earth).

   • Output terminals connect to BAT + / BAT – and LOAD 24V as per schematic.

5. Verification

   • Confirm 27VDC output across the battery terminals.

   • Check for correct LED indicator behaviour on the charger.

   • Ensure wiring integrity to all EXD drivers before commissioning.

System Diagram (Reference – Page 3)

• The schematic shows the charger connected in parallel to four batteries.

• The diagram labelled “After installation of the kit” indicates additional lines from NBC24V1BLC to the battery pack and EXD316 control driver.

Included Components

Field Service Note

• Battery voltage should be ≥ 24VDC before connecting to the EKE/EXD controllers.

• If voltage drops below 21VDC, replace or recharge before recommissioning.

• Always observe polarity to prevent board damage.

• Use this check as the first diagnostic step before replacing EKE or EXD modules on chillers or rooftop units.