Panel Pc 870 - Siemens Panel PC 670 Equipment Manual

Maintenance
4.2.2

Panel PC 870

Removing the
computing unit
Knurled screw
Ë
Operating unit
Fig. 4-3 Swinging the computing unit away from the operating unit (viewed from above)
4-4
Proceed as follows:
Disconnect the power supply.
1.
Swing open the mounting panel to obtain access to the rear of the PC
2.
870.
Loosen the four (retained) knurled screws which secure the computing
3.
unit to the rear side of the operating unit (see also Figure 3–3).
Swing the computing unit away to the left, whereby the two left clips act
4.
as hinges and thus prevent an unintentional releasing of the computing
unit.
Computing unit
Remove the cable connectors K1 and K2 of the operating unit (see Fi-
5.
gure 4-4) from their corresponding counterparts on the computing unit.
Lift the computing unit off the hinges of the operating unit and place it
6.
down carefully.
If necessary, you can now remove the operating unit by loosening
either the screws or, depending on the version, the six clamps which
secure the operating unit to the mounting panel (see Figure 3-3).
SIMATIC Panel PC 670 / 870 Operating Unit, Equipment Manual
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Clips acting as hinges
Edition 07/02