Automatic Transfer Switch

An Automatic Transfer Switch (ATS) is a low-voltage electrical device that automatically transfers essential loads from a failed primary power source (utility) to a backup source (typically an engine-generator) and returns them when the primary source is restored, ensuring power continuity and protecting sensitive equipment from downtime.

In a manufacturing or shop floor environment, the ATS is monitored as a critical asset within a CMMS. Its logic controller continuously verifies voltage and frequency of both sources. Upon detecting a utility fault, it initiates the generator start sequence, waits for steady-state operation, and physically switches the transfer mechanism to connect the load to emergency power, ensuring minimal disruption to production processes.

• ⚠️Mechanical wear and contact degradation: Contacts fail due to millivolt drop increases and resistance buildup from repeated operations or lack of cleaning, leading to heat generation or inability to close.
• ⚠️Control circuit/relay failures: Incorrectly set or drifted voltage/frequency sensing, pickup, and dropout parameters cause the ATS to fail to transfer or transfer unnecessarily.
• ⚠️Commissioning and protection issues: Poor commissioning leads to unoptimized protection settings, while increased operation cycles over time reduce protection reliability and can cause breakdowns during critical outages.