Wiring The Svi Ii Ap; Connecting To The Control Loop; Wiring Guidelines - GE SVI II AP-2 Quick Start Manual

Installation and Set Up

Wiring the SVI II AP

In order for the SVI II AP to communicate the positioner data the SVI II AP must
be physically connected to a HART communication. The procedure below outlines
wiring the SVI II AP.

Connecting to the Control Loop

The SVI II AP digital valve positioner MUST BE grounded according to local
regulations. It is important to maintain correct polarity at all times, otherwise the
positioner may not operate properly. Physically connect the SVI II AP to the HART
loop using a cable specified by the HART Communication Foundation. A shielded
cable is recommended.
To connect the Control Loop to the SVI II AP:
1. Connect one end of the cable to the control loop's
4 - 20mA output
2. Remove the threaded wiring covers on the positioner.
3. Connect the other end of the cable to the SVI II AP. There are two threaded
openings on the positioner. Use the opening with the red plastic insert.
4. Maintain polarity + and - respectively.

Wiring Guidelines

This list contains eight guidelines for a successful implementation of DC current
signal, DC power, and HART communication to the SVI II AP:
1. Compliance voltage at the SVI II AP must be 9 V at the maximum current of 20
mA.
2. Signal to the SVI II AP must be a regulated current in the range 3.2 to 22 mA.
3. Controller output circuit must be unaffected by the HART tones which are in
the frequency range between 1200 and 2200 Hz.
4. Frequency range of the HART tones must have a circuit impedance of more
than 220 Ohms, typically 250 Ohms.
5. HART tones may be imposed by the positioner and a communication device
located anywhere on the signaling circuit.
6. Capacitance of the signaling circuit must not exceed 0.26 microfarads or 0.10
microfarads with high series resistance.
Comply with current national and local regulations for electrical
installation work.
Comply with national and local explosive atmosphere regulations.
Before carrying out any work on the device, power off the instrument or
make sure that the local conditions for potentially explosive atmosphere
permit the safe opening of the cover.
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Wiring the SVI II AP