Emerson Process Management CI-9110, 9110-00A Multiple DPC Cabinets Powered by Single Power Supply

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1.Multi-Cabinet Instrument Grounding using Multiple Supplies. The instrument ground (24VRET terminal) of each DPC in a cabinet must connect to a terminal block within that cabinet that is electrically isolated from the cabinet frame. This terminal block must provide termination for all DPC instrument grounds within that cabinet and include termination for a #4 gauge (or greater), multistranded, insulated wire that will connect to the zero reference point of the facility. This #4 wire will be run through metal conduit (pipe) to the same termination point in the other cabinets. Only the #4 wire will be containe in this conduit. This conduit must also be connected by bonding strap to the cabinet and facility frame as described in the NEC.

2.Setting DPC Power Jumpers. If the DPC is a Model 3335 or 3310, jumpers W1A and W1B on the System Interconnect Board must be removed to isolate the chassis connection from the 24V RET connection (see Figure 8). If it is a Model 3330, jumpers W1A, W1B and W1C on the System Interconnect Board must be removed. Series 3308 Gas Flow Computers, if used with these systems, provide an isolated instrument ground without setting jumpers.

3.AC Power Source. The 24 Vdc power supply requires a 120 Vac power source. The ac power terminals of this supply are identified in Figure 8. The 120 Vac wiring for this supply must be contained in cable trays along with the power grid grounding wire. Figure 9 illustrates the cable tray layout and grounding points of a typical facility. The cabinet frame and the DPC chassis must be connected with bonding strap at points specified in the NEC.

4.Grounding of Peripheral Equipment. Some peripheral devices such as printers, CRTs, personal computers, etc., have their internal logic ground connected to the chassis. This configuration will cause loss of isolation between the DPC's instrument ground and chassis. These devices may still be used providing that opto-isolated circuits, galvanic isolation, or other types of circuitry between the device and the DPC are added to maintain the integrity of the DPC's "instrument ground to chassis" isolation.

Multiple DPC Cabinets Powered by Single Power Supply

All of the DPC cabinets in this installation operate from a single power supply which may be installed in one of the cabinets or in a separate cabinet. The following procedures apply:

1.Multi-Cabinet Instrument Grounding using Single Supply. The instrument ground (24VRET terminal) of each DPC in a cabinet must connect to a terminal block within that cabinet that is electrically isolated from the cabinet frame. This terminal block must provide termination for all instrument grounds within that cabinet and include termination for a multistranded, insulated, #4 gauge wire (or greater).

2.Routing of Instrument Ground and 24 V Power Wires. The #4 wire, along with +24V and 24VRET wires, are run through conduit trays to the power supply. The #4 wire connects to the 24VRET terminal of the supply and to the zero reference point of the facility. The +24V and 24RET wires connect to corresponding terminals on the power supply.

3.Cable Trays. Figure 9 illustrates the cable tray layout and grounding points of a typical facility. The cabinet frame and the DPC chassis must be connected with bonding strap at points specified in the NEC. The NEC also applies to the connection of the 120 Vac power supply terminals to the line.

12 / Supplement S1400

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Contents Remote Set Regulator Model 9110-00A IMPORTANT! Read Instructions Before Starting Warranty Bristol Inc MailPhone Bristol Inc. Repair Authorization Form off-line completion Training Telephone Support Technical Questions 860 860 945-2213 FAXVisit our Site on the World Wide Web Training Courses Model 9110-00A Remote SET Regulator Supplemental Instructions Theory of Operation Product DescriptionAnalog Regulator Model Remote Set Regulator Block Diagram of Analog Type Regulator Guard Input Current OutputBlock Diagram of Raise/Lower Type Regulator Raise/Lower Regulator Model Data PlateModel Number Breakdown = Pneumatic Output = Mounting Arrangement Page Two-Inch Pipe Mounting GeneralMounting In-Line MountingPressure Connections General PipingRegulator Assembly Moisture in LinesVenting Internal AccessLine Size Body and CoverSafety Note Electrical Conduit PortPage Cradle Switches with Open Designation Using Option SwitchesSlide Switches with on Designation Analog Input Models Switch FunctionsRegulator Assembly Switch SW1 & SW2 Functions & Settings RAISE/LOWER Input ModelsContinuous Signal Incremental SignalSwitch SW1 1-5, Pulse Increments Input FilterStatic or Dynamic Guard Input Guard InputOutput Rate of Change Guard LogicSwitch SW2 2-5, Output Rate Of Change Analog Failure Modes Fail Hold & Fail ZeroFAIL-ZERO Mode Page Field Wiring Terminal Identification For Analog Input Models Terminal Identification For Raise/Lower ModelsAnalog Voltage Input with Guard Analog Current Input 4-20 mA with Guard RAISE/LOWER Inputs with GuardRaise/Lower & Guard Inputs from Relay Contacts DC Power Current Output to FSK Bi-State TransmitterOperating Notes Initial ChecksField Wiring CI-9110 Service Troubleshooting Hints Procedure Setting Output LimitsTest Setup General PrinciplesCalibration Test Setup Calibration PrecautionAnalog Test Setup Preliminary Calibration CheckCurrent Output Span & Load Detailed Calibration for Analog ModelFeedback Zero & Span Pressure Output CheckRaise/Lower Test Setup Detailed Calibration for RAISE/LOWER ModelPCB Reference Drawings CPU Board & Termination Board Reference TableAssembly, Analog Type CPU Board with Current Output Assembly, Raise/Lower Type CPU Board with Current Output Analog Input Model RAISE/LOWER Input ModelAccuracy RAISE/LOWER Models Analog OutputAccuracy Analog Models Stepper Drive MechanismEnvironmental Pressure Regulator AssemblyInstrument Enclosure Range Factory Calibrated withHumidity 10 to 95% over -20to +130 F -29to +55 Range Model 9110 Main Parts Parts Referenced in FigureRemote Set Regulator Actuator Unit Remote Set Regulator Actuator Unit Mounting Parts Remote Set Regulator Assembly Basic Parts Remote SET Regulator Basic PartsGuidelines for System Grounding Basic Ground Rod Installation Noise and Signal Errors General RecommendationsGrounding of Equipment Housing Transients and Interference Grounding of Transmitter Types of Earth Grounds AC Power Grounding System Sandy Soil Dry SoilRocky Soil Several DPCs Mounted in Metal Cabinet with Power Supply Following installation procedures applyGrounding for DPCs and Power Supplies Single Metal Cabinet Multiple DPC Cabinets Powered by Single Power Supply Elements of a Facility Ground System Multiple Clusters of DPC Cabinets Powered by Local Supplies ReferencesPage Remote Set Regulator Model 9110-00A
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