Baker Hughes Masoneilan SVI II AP Quick Start Manual Download

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BHGE

SVI II AP Setups

Control Systems using Explosion Proof or Conventional I/O Systems must have a compliance
voltage greater than 9 V at 20 mA including wiring losses. See “Determining an SVI Positioner
Compliance Voltage in a Control System” on page

103.

Typical Control Systems using Intrinsic Safety methods must have a compliance voltage greater
than 17.64 V.

Typical system setups are shown in Figure 23 on page

46, General Purpose and Explosion Proof

(EEx d) Installation Schematic and Figure 24 on page

46, 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 24 on page

46 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 serial 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

There must never be more than one ground point for the shield wiring. Normally ground is con-
nected 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.