Baker Hughes Masoneilan SVI II AP, Quick Start Manual

Page: 42 / 108

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Connecting to the Control Loop
The SVI II AP digital valve positioner MUST BE grounded according to local regulations. It is im-
portant to maintain correct polarity at all times, otherwise the positioner may not operate prop-
erly. Physically connect the SVI II AP to the HART
®
loop using a cable specified by the Field
Comm
®
Group. 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 po and - respectively.
Wiring a Position Retransmit
CAUTION
For proper operation, maintain signal po and -
respectively.
To connect:
1. Strip the insulation at the end of the wires. Strip approximately 1/4” (6.35 mm) of
the insulation at the end of wires (wire size 14 to 28 AWG, 2.5 mm
2
to .08 mm
2
).
2. Connect the + ⁄ - terminals from the 4-20 mA Out to the position retransmit input
signal: + to + and - to -. See Figure 8 on page 20.
To troubleshoot retransmit connections:
Ensure that the retransmit circuit has a minimum voltage of 10 V (maximum
30 V).
Ensure the minimum AO current is 3.2 mA. If the module loses power and the
AO circuit remains powered, the AO signal will be 3.2 mA.