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Hazardous Area
SVI II ESD
GE DPI620
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.
174 |
=GE Oil & Gas
Single Channel
Zener Barrier
Barrier
Resistance
Figure 82 Intrinsically Safe Installation
Non-Hazardous Area
Power
Supply
220 Ohms
HART Compliant
Control System
Output Card
HART
Modem
ValVue ESD
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