Grounding; Convenience Outlets; Isolation Transformers - HP 64000 Reference Manual

MODEL 64000 SYSTEM OVERVIEW MANUAL
Grounding
Model 64000 component are equipped with three-conductor power cords which, when
connected to appropriate power receptacles. ground the system. The green-wire safety
ground is connected to the metal frClme of each component in the system to provide a return
path for fault currents due to equipment malfunction or external faults such as lightning
strikes. Do not operate the system from an ac power outlet which has no ground connection.
Be sure there is a green-wire ground from the power outlet to the distribution panel where the
circuit breaker is installed.
NOTE
To ensure good communications over the system bus, all
power sources must be at the same ground potential.
Convenience Outlets
Power outlets for janitorial maintenance
i
vacuum cleaners. floor buffers. etc
i
must be wired
on a separate circuit breaker from the Model 64000. If these precautions are not taken,
operation of janitorial equipment will induce noise transients on the system power lines, which
can cause abnormal operation of the system.
Isolation Transformers
Switching heavy electrical machinery loads or operating certain types of equipment near the
system can cause problems, even though the source is on a different circuit breaker. In some
cases, it is mandatory to provide a separate circuit and circuit breaker for the system directly
from the main building power. In extreme cases of severe electrical noise, it may be necessary
to install an isolation transformer.
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