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4.3
Ambient and environmental conditions
When you plan your project, you should make allowances for:
● Observe the climatic and mechanical environmental conditions in the technical data in
● Avoid extreme ambient conditions as far as possible. Protect your device against dust,
● The device is designed for use in normal industrial environments to IEC 60721-3-3
● Do not expose the device to direct sunlight.
● Install the device in such a way that it poses no danger, for example, by falling over.
● The device conforms to protection class IP41 at the front panel. Ensure that the
● Always maintain a minimum clearance of 50 mm to the area of the ventilation slots in
● Do not cover the ventilation slots of the enclosure.
● The device meets requirements for fire protection housings to EN 60950-1 and can be
● The connected or built-in peripherals should not introduce a counter emf in excess of
SIMATIC Rack PC 847B
Operating Instructions, 06/2008, A5E02203168-01
your operating instructions.
moisture and heat.
(pollutant class 3C2 for chemical influence, 3S2 for sand and dust.) SIMATIC Rack PCs
may not be operated in severe environments which are subject to caustic vapors or
gases without taking additional protective measures (such as the provision of clean air.)
installation opening for the device is splash-proof in areas which may be subject to splash
water.
order to ensure adequate ventilation of the PC.
installed without additional fire protection enclosure.
0.5 V into the device.
WARNING
Failure to comply with these requirements for system installation shall render approvals
to UL 60950-1, EN 60950-1 void and leads to the risk of overheating and injury!
Application planning
4.3 Ambient and environmental conditions
27
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