Main power cable disconnected from one of the LPS units.

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

Disconnected wire unit between the “CTRL IN” and“CTRL OUT” sockets of the LPS units.

Reconnect the wire unit between the “CTRL IN”and “CTRL OUT” sockets of the LPS units.

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 of one of the LPS units. The red LED “ERR”of the malfunction LPS unit flashes fast.

Replace the whole LPS module.

Defect Power Backplane.

Replace the Power Backplane.