User Manual IK 150 / 0031 e
© 1997 PAT GmbH · D-76275 Ettlingen · Hertzstr. 32 - 34 ·
)
++49 (0) 7243 709-0 · FAX ++49 (0) 7243 709-222 · Email: [email protected]
29
50 / 150 / 19_0031E.DOC / 19.03.1997 / Rev. C / rk.
PAMPHLET 4
Instructions to ensure the electromagnetical compatibility (EMC)
with electronic systems under the effect of electromagnetic fields
Electromagnetic fields increasingly affect electronic systems and can thus cause malfunctions for whose
elimination we shall indicate some preventive measures according to today's state of engineering below:
1.
The preventive measures are mainly based upon the idea to shield the electronic circuits from irradiated
high frequency interferences:
- All components will have metal housings outside with grounding possibility;
- The cables used will have braided shields. The shield applied must be highly conductive as to the
surface of all junction areas;
- Coupling of crane ground and electronic ground at only one point of the system.
2.
The general measures listed in item 1, however, cannot ensure complete protection against electro-
magnetic fields in individual cases because the size and the type of the effect depends on the local
conditions.
The influencing factors, inter alia, are as follows:
- Particularly unfavourable arrangement of the antenna as to the system;
- Very high transmitter powers;
- Impossible to observe the measures of item 1 consistently by reason of local conditions;
- Long cables;
- Interferences coupling into the supply lines.
With unfavourable conditions you can therefore not do without taking any measures exceeding the pre-
ventive ones experimentally on site, taking into account the principles mentioned in item 1, e.g.:
•
Adding filters or short-circuiting the interfering frequencies by means of capacitors;
•
Making or removing ground connections;
•
Using double shielded cables (guarded shield system).