Siemens SINUMERIK 808D Manuale di servizio - Pagina 13

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3.3

MCP connection fault

Fault description

● The MCP does not respond after power-on. All the status LEDs on the MCP are off and no operation is possible.

● All the status LEDs on the MCP are flashing all the time.

Note that the alarm 400003 may appear in the above cases.

Diagnostic steps

Check whether the connection cable between the MCP and the PPU is in good condition and properly connected. You

may verify this by using a new cable.

Check whether the PPU interface X30 or the MCP interface X10 is damaged or subject to bad contact. You may verify

this by using a new cable.

Check the PLC programs since a PLC program fault can also cause the flashing of all the status LEDs on the MCP.

Replacement and maintenance are necessary if the fault still exists after the above operations, because probably the

PPU or MCP is damaged.

3.4

Fault description

Some keys on the MCP have no response. A key press fault occurs normally in the following keys:

and

Diagnostic steps

Service Manual

01/2017

Select the system data operating area.

Open the PLC status monitoring window through the following softkey operations:

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