Product Description:

The 5AC901.BUPS-00 is a backup power module produced by B & R Automation for the 5AC CNC Addon Modules series. Installed on the DC link of a CNC control system, the unit keeps axis control electronics alive long enough to execute a controlled stop or a data-saving routine during a mains loss. By maintaining the 24 V rail through an integrated battery pack, the module protects position registers, tool offsets, and other volatile parameters in industrial automation cells.

The energy store uses VRLA chemistry sealed inside two Hawker Cyclon cells wired as 2 × 12 V in series, giving a nominal bus support voltage of 24 V. With a rated capacity of 4.5 Ah, the pack can supply several minutes of hold-up current for typical motion controllers before the drive capacitors discharge below safe limits. Because lead-acid chemistry self-discharges slowly, the manufacturer specifies a storage recharge interval of 6 months. An onboard NTC resistance sensor reports cell temperature to the supervisory PLC so charging current can be limited in warm ambient conditions, which helps extend service life.

The housing is 145 mm deep, 78.2 mm high, and 223.2 mm wide, allowing the assembly to sit on a standard DIN rail segment without overhanging adjacent I/O slices. Operation is permitted up to 3000 m elevation, so derating is unnecessary for high-altitude machine tools. The Hawker Cyclon cell construction uses pure-lead plates that tolerate high discharge rates, matching the surge demands of servo drives during sudden outages. Heat generated by rapid cycling is detected through the NTC sensor, allowing the host controller to adjust charge behavior and reduce the risk of overheating. The compact layout also suits dense control cabinets where neighboring modules must remain accessible for wiring and airflow.