AC Transfer Module

AC Transfer Module

The AC Transfer Module (ATM) monitors both AC inputs and its own circuitry, If an AC input is lost or faulty, the module automatically transfers to the redundant input. The ATM generates a Power Fail Interrupt signal if both lines are lost or below the low voltage threshold. It sends this signal to the Bus Monitor Module (BMM). The BMM sends the PFI signal to the appropriate process control modules, thereby interrupting their operation. Visible through the front panel are three LED indicators. The red/green LED at the top shows whether the module is operating normally (green) or not (red). The two other LEDs (LINE 1 and LINE 2) provide AC input status (green = good, red = bad).