Riken Keiki GP MED EX, Operating Manual

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4 How to Use 4-3. Precautions for system designing
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please contact the manufacturer.)
Grounding
In addition to lightning, there are more sources of surge noise. To protect units
from these noise sources, the units must be grounded.
* The lightning arrester has a circuit to remove a surge voltage which damages field devices, so that signals
may be attenuated. Before installing a lightning arrester, verify that it works properly.