Safety and Reliability 2.4.2. To be observed during maintenance and servicing - Precaution regulation VBG 4.0 must be observed, and §8 (Admissible deviations during working on parts) in particular, when measuring or checking a controller in a power-up con- dition. - Repairs must only be made by specially trained Kuhnke staff (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 modules must be used in modular controllers. - Modules must only be connected to or disconnected from the controller with no voltage supplied.
Otherwise they may be destroyed or (possibly not immediately recognizably!) de- tracted from their proper functioning. - Always deposit batteries and accumulators as hazardous waste. 2 - 4