Main power cable disconnected from the LPS unit.

Check if the main power cable is connected with the “MAINSINPUT” socket of the LPS unit.

Disconnected wire unit between the “CTRL IN” andthe LPS interface board.

Reconnect the wire unit between the “CTRL IN”and the LPS interface board.

Disconnected wire unit between the Power Backplane and the LPSinterface board.

Reconnect the wire unit between the Power Backplane and theLPS interface board.

Malfunction LPS interface board.

Replace the LPS interface board.

Malfunction LPS unit. The red LED “ERR” of themalfunction LPS unit flashes fast.

Replace the whole LPS module.

Defect Power Backplane.

Replace the Power Backplane.