Device Grounding on the SDN
9-2
Device Grounding on the SDN
SDN is a ground referenced communication protocol. It requires that the
chassis of each device connected to the SDN be interconnected for proper
operation. Failure to maintain this connection may result in
communication errors and poor performance. In order to maintain a safe
system, each device may also require a redundant Protective Earth (PE).
The ACC has been designed to use a redundant PE to insure compliance
with IEC 601-1-1 when connected to an SDN. The second PE connection
insures system safety. When the ACC is powered using electrical conduit,
the conduit provides the second PE. But when the ACC is powered using a
power cord, the second PE can be made using the green/yellow wire
exiting the ACC. This wire should be connected to the building ground.
The SDN wall box provides for attachment of a PE connection. This
connection point should be connected to the building ground. The second
PE connections along with measurement of the voltage between the ACC
and any SDN medical device ensures system safety.
Figure 9-1. Second Ground on Rear of ACC
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