GE BAKER HUGHES Masoneilan SVi 1000 Quick Start Manual

© 2019 Baker Hughes, a GE company, LLC. All rights reserved. Masoneilan SVi1000 Positioner Quick Start Guide =| 33Wiring GuidelinesGuidelines for a successful implementation of DC current signal, DC power, and HART® commu-nication to the SVi1000: Compliance voltage at the SVi1000 is approximately 9 V at the current of 20mA. “Determining an SVI Positioner Compliance Voltage in a Control System”on page 63. Signal to the SVi1000 must be a regulated current in the range 3.2 to 22 mA. Controller output circuit must be unaffected by the HART® tones which arein the frequency range between 1200 and 2200 Hz. In the frequency range of the HART® tones, the controller must have a circuitimpedance of more than 220 Ohms, typically 250 Ohms. HART® tones may be imposed by the positioner and a communicationdevice located anywhere on the signaling circuit. Cabling must be shielded to prevent electrical noise that would interfere withthe HART® tones, with the shield grounded. Shield must be properly grounded in only one place. For details and calculation methods for wiring resistance, and capacitanceand for calculation of cable characteristics, refer to the HART® FSK PhysicalLayer Specification. For split range installations the output voltage must be sufficient to operatetwo positioners (11 V @ 4 mA, 9 V @ 20 mA) and the expected voltage drop inthe cable. Use of a low impedance voltage source damages the SVi1000. The currentsource must be a true high impedance current limiting device. A propercurrent source explicitly enables adjustment of the current, not the voltage. Position Retransmit: when wiring this feature: Use the same gauge wires as the 4-20 mA control loop. Ensure that the position retransmit signal is connected to the controlsystem’s analog input card. Ensure the control loop is powered while making measurements with ameter.WARNING This process can cause the valve to move. Before proceeding besure the valve is isolated from the process. Keep hands clear frommoving parts.