GEC ALSTHOM MVUA11B1BD0784B Digital input module

REMOTE TURN ON CIRCUIT This feature allows the user to control the power supply from a remote location with a 12-24 Vdc, 24-115 Vac or a dry contact closure. U4 provides isolation from the power supply ground. When using a dry contact closure, the power is supplied by the bias transformer, rectified on the A100 board, and then routed to J14 to CR47. The interlock side is opened or closed by J1 15 and J1 16.

INRUSH CURRENT LIMITING CIRCUIT 

The soft start is controlled by the A100 board and works in conjunction with the K1 that is on the input rectifier assembly. When power is applied to the supply, the output of U12 is low. The input bus capacitors are charged via K1 with a resistor to limit the inrush current. After the elapsed time, which is determined by R47, R49 and C42, the output of U12 switches to high, closing both poles of the relay (K1). The soft start pins of U15, U16, U17, and U18 go high, enabling the PWMs.

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