KUHNKE Automation
Reliability, Safety
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3.5.1 Project Planning and Installation
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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).
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Power breakdowns or power fades: the program structure is to en-
sure that a defined state at restart excludes all dangerous states.
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Emergency-off installations must comply with EN 60204/IEC 204
(VDE 0113). They must be operative at any time.
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Safety and precautions regulations for qualified applications have to
be complied with.
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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.
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Relevant standards and VDE regulations are to be complied with in
every case.
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Control elements are to be installed in such a way as to exclude un-
intended operation.
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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
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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.
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Repairs must be carried out by specially trained Kuhnke staff only
(usually in the main factory in Malente). Warranty expires in every
other case.
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Spare parts:
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Only use parts approved of by Kuhnke. Only genuine Kuhnke mod-
ules must be used in modular controllers.
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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.
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Always dispose of (rechargeable) batteries as hazardous waste.
