Kuhnke PG 674, Instruction Manual

Page: 12 / 52

2 - 4
Reliability/Security
2.4.2. To be observed during maintenance and servicing
- During measuring and checking operations on a controller in
a power-up condition, precaution regulation VBG 4.0 has to
be observed and §8 (Admissible deviations during working on
parts) in particular.
- Repairs must only be executed by the trained Kuhnke person-
nel (usually in the main factory in Malente). Warranty ex-
pires in any 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 special waste.
2.4.3. Measures for the prevention of electrostatic charge
Electrostatic charge is dangerous for components and assembly
groups. It is a peculiarity of electrostatics to not destroy the sen-
sitive components but to damage them in a not immediately
conceivable way. It is because of this that devices stop function-
ing after some time of service.
The ESD measures (ESD = electrostatic discharge) executed in
the factory are only guaranteed to be effective if they are also
regarded by the user (service).
Please note:
- Only store parts in their factory-packing or in an antistatic
packing of similar quality.
- Assembly groups must only be touched by persons who are
grounded via a wrist bracelet and/or a discharging mat and
shoe-grounding strips ( observe protection of people!).
- Only ship assembly groups in their factory-packing or in an
antistatic packing of similar quality.
Reference to literature (Fa. 3M Deutschland GmbH,
Neuss): Information brochure
Interesting Facts about Electrostatics in Micro-Electronics