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GE Oil & Gas
SVI II AP Setups
Typical system setups are shown in Figure 19 on page
38, General Purpose and Explosion Proof
(EEx d) Installation Schematic and Figure 20 on page
38, Intrinsically Safe Installation Schematic.
The SVI II AP digital valve positioner can be located in a general-purpose or hazardous area pro-
tected by Explosion Proof (EEx d) methods. Wiring diagrams are generalized, actual wiring must
adhere to Electrical Installation section of manual and local electrical codes. The use of a Hand-
held Communicator or a HART
®
modem is not permitted in the Hazardous Area protected by Ex-
plosion Proof (EEx d) methods. In Figure 20 on page
38 the SVI II AP digital valve positioner is
located in a hazardous area that is protected by Intrinsically Safe wiring practices.
The SVI II AP requires an electrical input from a 4-20 mA current source. The SVI II AP input signal
can carry a HART
®
communication protocol signal from ValVue software and a HART
®
modem,
or from a HART
®
Hand Held Communicator. Since the process control system, the source of the
input signal, is located in a non-hazardous location, setup requires an intrinsic safety barrier be
placed between the process control system and the SVI II AP. If the SVI II AP is located in a haz-
ardous area with Intrinsically Safe protection a barrier is not required for a flameproof installa-
tion. Alternatively the system can be installed as Explosion Proof
⁄
flameproof. SVI II AP can
communicate with a remote PC running ValVue software via a modem connected to the PC's se-
rial or USB port. The PC, which is not intrinsically safe, must be connected to the circuit on the
safe area side of the intrinsic safety barrier if the valve is located in a hazardous area.
The SVI II AP can be operated, calibrated, configured, and interrogated either by using local
pushbutton and display, or by using a PC running ValVue software, HART
®
Handheld Communi-
cator, or any registered HART
®
Host that supports DDs. The HART
®
Handheld Communicator is
approved for Intrinsically Safe use in accordance with FM and ATEX standards. Read and observe
all handheld labeling. The SVI II AP is polarity sensitive so the positive lead must be connected to
the positive (+) terminal and the negative lead to the negative (-) terminal. Reversing the input will
not cause damage but the unit will not function.
Grounding Practices
To ensure proper grounding make sure that case, signal, and ground connections are made in
compliance with the plants normal grounding practices. Any point in the loop can be referenced
to ground, but there must never be more than one ground point. Normally ground is connected
at the controller or at the intrinsic safety barrier.
The case grounding screws are located on the outside of the case at the lower right 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.
If noise or instability is present, set the positioner to MANUAL mode of operation and manually
position the valve over its 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.
