Siemens NCU 7 0.2 Series Manual page 10

Safety Information
1.1 Danger notices
Power cables and signal lines should be installed in such a way that inductive and
capacitive interference does not in any way impair the automation and safety functions.
Repairs to devices that have been supplied by our company may only be carried out by
Siemens customer service or by repair centers authorized by Siemens. When replacing
parts or components, only use those parts that are included in the spare parts list.
Before opening the device, always disconnect the power supply.
Emergency stop/off devices which comply with EN 60204 / IEC 60204 (VDE 0113-1) must
remain effective in all automation equipment operating modes. The act of releasing the
emergency stop/off device must not cause an uncontrolled or undefined hot restart.
Additional external measures must be taken, or devices must be created that enforce a
safe operational state even when there is a fault (e.g. using independent limit value
switches, mechanical locks, etc.) at any location in the automation equipment where faults
might cause major material damage or even physical injury, in other words, where faults
could be dangerous.
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WARNING
WARNING
Manual, 02/2011, 6FC5397-0AP20-0BA0
NCU 7x0.2