Si30-408 Method of Troubleshooting
Troubleshooting 95
3.9.4 Verification of D-III NET Transmission Waveform
When the waveform as shown below appears in measuring of transmission waveform, transmission
malfunction may probably be caused.
Above abnormal waveforms are generated due to field factors. Some countermeasures shown in below
table can be applied at the equipment side, and conduct proper measure according to the state of
waveform.
Symptom Possible Cause Corresponding example
Round pulse Too long wiring length, too many units connected,
or branches of wiring
Installation of D-III NET expander adapter,
Separating the system, (Resistance in the end of line
cannot be used.)
Ringing High voltage cables provided close to the
transmitting line, or multi-core cables used
Installation of D-III NET expander adapter,
Correction of wiring
Noise Close to high voltage cable of inverter Installation of D-III NET expander adapter
Correction of wiring
Faulty waveform Faulty transmitting circuit of PC board Replacing faulty PC board
Short pulse with 1V or less or overshoot of waveform at start-up is not problem.
(Round pulse)
(Ringing)
(Faulty waveform)
(Noise)
This waveform causes no
malfunctions.
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