Application Scenarios

In a pharmaceutical cleanroom, a batch process controlled by an AC 800M controller runs for 48 hours. If a prolonged facility-wide power outage occurs, the main 24V system power supply fails, but the control system must not lose the intricate recipe steps, accumulated batch data, and precise timing information stored in the controller’s RAM. The ABB SB822 3BSC760019E1 Battery Unit​ is plugged into the dedicated battery connector on the PM/PC 892​ controller CPU. When main power is lost, this unit instantly takes over, providing a low-current trickle of power exclusivelyto the controller’s memory and clock circuits. It can maintain this data for weeks or even months. After the 8-hour power outage, when facility power is restored, the controller boots up with its program, all setpoints, and the correct time intact. Operators can immediately resume the batch from the point of interruption, avoiding the catastrophic loss of the entire product batch and the days of re-validation that would be required if the program and data were lost. The SB822​ directly solves the critical challenge of intellectual property and process state preservation during unforeseen downtime.

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