KUHNKE Automation Reliability, Safety 3.5.1 Project Planning and Installation • 24 VDC power supply: generate as electrically safely separated low voltage. Suitable devices include split-winding transformers built in compliance with European Standard EN 60742 (corresponds to VDE 0551). • Power breakdowns or power fades: the program structure is to en- sure that a defined state at restart excludes all dangerous states. • Emergency-off installations must comply with EN 60204/IEC 204 (VDE 0113). They must be operative at any time. • Safety and precautions regulations for qualified applications have to be complied with.
• Please pay particular attention to the notices of warning which, at relevant places, will make you aware of possible sources of danger- ous mistakes or faults. • Relevant standards and VDE regulations are to be complied with in every case. • Control elements are to be installed in such a way as to exclude un- intended operation. • Lay control cables such that interference (inductive or capacitive) is excluded if this interference could influence controller operation or its functionality. 3.5.2 Maintenance and Servicing • Precautions regulation VBG 4.0 to be observed when measuring or checking a controller after power-up.
This applies to section 8 (Ad- missible deviations when working on parts) in particular. • Repairs must be carried out by specially trained Kuhnke staff only (usually in the main factory in Malente). Warranty expires in every other case. • Spare parts: • Only use parts approved of by Kuhnke. Only genuine Kuhnke mod- ules must be used in modular controllers. • Modular systems: always plug or unplug modules in a power-down state. You may otherwise damage the modules or (possibly not im- mediately recognisably!) inhibit their functionality. • Always dispose of (rechargeable) batteries as hazardous waste. E 774 GB 11 30.06.2014