© Siemens AG, 2004. All rights reserved
EMC Installation Guideline – Planning Guide (EMV) – 03.2004 Edition
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8 Troubleshooting and Fault Elimination
8.1 Troubleshooting
Exact observation and recording of the errors which have occurred facilitates
troubleshooting. The more precise the error description, the more accurate the
resultant troubleshooting. Ensure that no misinterpretation is possible or has
occurred when passing on the error description.
Localisation of the interference source
· Is the malfunction continuous or intermittent?
· Is there any relationship between the occurrence of errors, the error rate and
the operation modes of the malfunctioning system with the operation of other
devices?
· Is it possible to identify the interference source via step-by-step shutdown of the
devices within the system?
· Check the supply voltages!
Localisation of the interference sink
· Does no malfunction clearly exist due to hardware or software errors?
· Are there devices or system components which are, however, affected but
those malfunctions are not directly detectable, e.g. transmitters which can
influence the complete system?
· Use the diagnostic possibilities which are available in the systems (LEDs, error
displays, error counters….) for the identification of the affected appliance.
· The intentional shutdown/separation/replacement of parts of the system assists
when locating the affected part. Shutdown e.g. by:
- Modification of the mode of operation.
- Deactivation of functions.
8.2 Fault clearance
For the elimination of malfunctions due to insufficient EMC, the basic procedure is
as follows:
· Eliminating or reducing the interference sizes generated by the interference
source by means of coil wiring, filter, shield plates, etc.
· Increasing the noise immunity of the influenced appliance by means of filters,
shielded housing etc.
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