Masoneilan Products SVI II ESD - GE Energy

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GE Energy SVI II ESD Quick Start Analog with Discrete Safety Demand (A/DSD) The Analog with Discrete Demand configuration is: 4 - 20 mA power input with superimposed HART communications for control system and 24 VDC 2 wire for Safety System (Figure 15). Control System or Safety System AO Setpoint 4- 20 mA+ HART Safety System DO Safety Trip Signal Discrete 3 VDC- 24 VDC SVI II ESD 4 Wire Solution -Safety Function Triggered by Discrete 0 - 24 VDC Signal (3 VDC = Safety Trip) Figure 15 Analog with Discrete Safety Demand (A/DSD) Configuration HART Wiring Guidelines In order for the SVI II ESD to communicate, the SVI II ESD must be physically connected to a HART compliant network. “Connecting to the Control Loop” outlines wiring the SVI II ESD. Connecting to the Control Loop The SVI II ESD 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 ESD 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 ESD: 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 ESD. There are two threaded openings on the positioner. Use the opening with the red plastic insert. 4. Maintain polarity + and - respectively. 34
Installation and Compliance Voltage in Single Drop Current Mode Powering Up the SVI II ESD The SVI II ESD requires 9.6 Volts at 20 mA and 11.0 Volts at 4 mA. Typical HART devices require MORE Voltage at higher current and MORE current source have LESS Voltage available at higher current. The SVI II ESD is unique in that it requires LESS Voltage at higher current which compliments the characteristic of the source requiring only 9.6 Volts at 20 mA. NOTE Powering Up the SVI II ESD Improperly or inadequately grounded installations can cause noise or instability in the control loop. The internal electronic components are isolated from ground. Grounding the case is unnecessary for functional purposes but grounding the case may be necessary to conform to local codes. Verify the wiring and connections and then connect the current source. Connecting a Power Source Depending upon the configuration of the SVI II ESD, powering up the unit consists of connecting to the 4-20 mA current source or the 24 VDC power source. WARNING This process can cause the valve to move. Before proceeding ensure the valve is isolated from the process. Keep hands clear from moving parts. NOTE When an SVI II ESD is turned on it is advisable to apply the air supply before applying the electrical input signal. Powering Up the ASD Configuration The ASD, or Analog Safety Demand, configuration uses a 4 - 20mA current source for power. CAUTION Use of a low impedance voltage source damages the SVI II ESD. The current source must be a true high impedance current limiting device. A proper current source explicitly enables adjustment of the current in mA, not Volts. 35
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