Allen-Bradley 1606-XLSBUFFER24 Buffer Module

Allen-Bradley 1606-XLSBUFFER24 Capacitor Buffer Module

Product Introduction

The 1606-XLSBUFFER24 belongs to the Allen-Bradley Bulletin 1606-XL series and works alongside a 1606-XLS power supply. This buffer module stores energy in integrated electrolytic capacitors rather than a battery. Consequently, it bridges short mains interruptions and protects control systems from brief power dips. Maintenance teams appreciate the battery-free design because it removes replacement schedules and disposal concerns. The 1606-XLSBUFFER24 suits PLC racks, HMI panels, and industrial PCs that need ride-through during voltage sags.

Technical Specifications

The module draws from a 24 to 28.8V DC bus supplied by the connected power supply. During normal operation, output voltage tracks the input between 22.5 and 27.8V DC. Once mains power fails, the unit switches to buffer mode and holds the output at 22.5V. Maximum output current reaches 20A, which gives a rated power of 480W. Buffer time is 310 ms typical at 20A, enough to cover most short interruptions. Additionally, charging time is about 18 seconds after a buffer event.

The integrated storage element holds 0.2 kWs of energy in electrolytic capacitors. This design avoids the aging limits of batteries and needs no periodic testing. Furthermore, the module has no communication ports or protocols, so it operates as a passive power stage. Installers simply wire it in parallel with the DC bus.

Mechanical and Environmental Parameters

The housing measures 124 mm high, 64 mm wide, and 102 mm deep. Weight is approximately 0.74 kg. Mounting uses DIN rail only, which keeps the panel layout tidy. Operating temperature spans -25 to +70 °C, covering most industrial environments. Storage temperature spans -40 to +70 °C. Relative humidity ranges from 5 to 95 percent non-condensing. The protection rating is IP20 for open-frame DIN rail construction. Approvals include UL 60950-1, cUL, and CE marking.

Installation Guide

First, mount the module on a DIN rail next to the 1606-XLS power supply. Next, connect the DC bus input to the supply output using short, thick wires. Then, wire the buffer output to the loads that need ride-through support. After that, verify the bus voltage sits within the 24 to 28.8V DC range. Finally, allow about 18 seconds of charging before testing a mains interruption. Keep ventilation slots clear during operation.

Packaging List

• 1 × Allen-Bradley 1606-XLSBUFFER24 buffer module

• 1 × installation instruction sheet

• Protective carton packaging

Shipping methods: Fedex, UPS, DHL.

FAQ

Q1: Does the 1606-XLSBUFFER24 use a battery?
A: No. It stores energy in integrated electrolytic capacitors, so no battery maintenance is needed.

Q2: How long can it bridge a mains interruption?
A: Buffer time is 310 ms typical at 20A load.

Q3: What output current can the module deliver?
A: It supports up to 20A maximum, giving a rated power of 480W.

Q4: What voltage appears at the output during buffer mode?
A: The output holds at 22.5V DC while the module supplies stored energy.

Q5: How long does recharging take after a buffer event?
A: Charging time is about 18 seconds before full buffer capacity returns.