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Figure 83 Intrinsically Safe Installation
Grounding Practices
To ensure proper grounding make sure that case and ground connections are made in
compliance with the plants normal grounding practices. There must never be more than one
ground point for the shield of the signal wiring. Normally ground is connected at the controller
or at the intrinsic safety barrier.
The case grounding screws are located outside of the case, at the lower right corner of the
display cover and inside the cover. The case is isolated from all circuitry and can be grounded
locally in accordance with applicable codes.
Whenever after wiring or grounding, noise or instability is present, set the positioner to
MANUAL mode of operation and manually position the valve over it’s entire range. If the valve
is stable in MANUAL mode then the problem can be noise in the control system. Recheck all
wiring connections and ground points.
Power
Supply
220 Ohms
HART Compliant
Control System
Output Card
HART
Modem
SVI II ESD
ValVue ESD
Barrier
Resistance
Single Channel
Zener Barrier
Hazardous Area
Non-Hazardous Area
GE DPI620
Summary of Contents for SVI II ESD
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