4.4.3EXAMPLE OF A `DAISY CHAIN SYSTEM, 4-10 | Emerson 2468CB

4.4.3EXAMPLE OF A `DAISY CHAIN' SYSTEM

Remote Display Options 24683B, C & D

Hydrastep 2468CB & 2468CD Manual

4.4.3EXAMPLE OF A `DAISY CHAIN' SYSTEM

Figure 4.5 shows two remote displays connected in a `daisy chain'. Where more than one remote display is in use, local supplies with isolated outputs must be used to power the extra unit(s).

To prevent signal reflections from corrupting the data, it may be necessary to fit termination resistors to the last unit in the chain. The resistor values should match the characteristic impedance of the cable (120Ω, typical). A termination resistor is connected between pins 3 and 4, and 17 and 18, on terminal block TB1. A suitable resistor to use is a ¼W metal film type.

Figure 4.5 - Daisy chain connection example for two remote displays

4-10

24685034

Image 128

Emerson 2468CB, 2468CD manual 4.4.3EXAMPLE OF A `DAISY CHAIN SYSTEM, 4-10

Contents

Hydrastep 2468CB and 2468CD HydrastepElectronic Gauging System Dual Power Supply Version SYMPTOM SOLUTION See NoteCATEGORY POSSIBLE CAUSES See Note HYDRASTEP START-UP Mobrey Customer Support About this manual Part 1 – Electrical/Electronic SystemPart 2 – Pressure Parts Part 3 – Appendix SYMBOLS USED IN THIS MANUAL AND ON THE UNIT Symbol MeaningPage Part Hydrastep 2468CB & 2468CDElectronic Gauging System 24685034 Pt.1-2 DANGEROUS VOLTAGES ARE PRESENT IN Pt.1-4 Contents Part Pt.1-6 Contents IllustrationsPage No Tables 0040 1.1WATER LEVEL MEASUREMENT Hydrastep 2468CB and 2468CD Manual 1.2.2DISPLAY BOARD 1.2HYDRASTEP 2468 ELECTRONIC GAUGING SYSTEM1.2.1INPUT BOARDS 1.3SYSTEM OPTIONS 1.2.3SYSTEM FAULTS 2468CB OR 2468CD1.3.1OUTPUT BOARDS 1.3.2REMOTE DISPLAY UNITS Table 1.1 - Upgrade paths and available options Existing SystemAvailable Options Comments Hydrastep 2468CB and 2468CD Manual 2468CB & 2468CD Dual Power Supply Version FAULT ANALYSIS & CORRECTIVE ACTION SPECIFICATION2-23 2-32 2.1INTRODUCTION 2.2ELECTRODE CABLING SYSTEM2.3ELECTRONIC ENCLOSURE Number of 2468CB & 2468CD Dual Power Supply Version 2.3.2REMOTE DISPLAY DRIVE CAPABILITY 2.3.1INPUT BOARD PCB 24680501 AND PCB2.3.1.1Analogue Output Drive Capability 2.3.3DISPLAY BOARD PCB 2.3.3.1Link LK1 2.3.3.2Links LK2, LK3, LK4 and LK5 No. of Electrodes usedLink Headers fitted 2.3.4PCB INTERCONNECTIONS 2.4INSTALLATION Hydrastep 2468CB and 2468CD Manual 2-10 Electrode connections 2-11 Water column connections for 16 electrodesConductor Number 2.4.2.3Connecting the Electrode Cable Assemblies to 2468 Enclosure 2-12 2-13 AC Powered Units input board2.4.2.4Hydrastep Power Supply Cables Figure 2.4 Voltage Selection 240V or DC Powered Units input board2-14 2-15 2.4.2.5Analogue Output Connection Part of Display Board showing PL4 2.4.2.6Opto-IsolatedFault Output Connection2-16 2.5SYSTEM CONFIGURATION 2.5.1.1Analogue Output Configuration2-17 2.5.1INPUT BOARD PCB 24680501 OR 2.5.1.2Pulsed Output Setting 2.5.1.3Electrode Error Configuration2-18 Input Board Option Board Removed 2-19 Offset voltages 2.5.2.1Link LK1 Setting 2-202.5.2DISPLAY BOARD Table 2.2 - Number of electrodes being displayed 2-21 2-22 2.5.2.3‘Switching Threshold’ Setting2.5.2.4 ‘Compatibility’ Setting 2.6FAULT ANALYSIS & CORRECTIVE ACTION 2-23 Faults 2-24Indication Analysis and Corrective Action 2-25 2-26 2-27 Bottom half ofalternates alternating between water and steam green and Bottom half of 2-28State 5 contd 2-29 2.6.1COMPONENT REPLACEMENT 2-302.6.1.1Removing the Input Board 24680501 or 2.6.1.2Refitting the Input Board 2.6.2PARTS LIST - HYDRASTEP 2468 CB & CD VERSIONS 2-31Item Description Mobrey SPECIFICATION 2-32 Page No Wiring Diagrams for Dual Power Supply Version2-WD.1 Wiring Diagrams for Dual Power Supply Version 2-WD.2 Wiring Diagrams for Dual Power Supply Version 2-WD.3 2-WD.4 2-WD.5 2-WD.6 2-WD.7 2-WD.8 2-WD.9 2-WD.10 Hydrastep 2468CB and 2468CD Manual 2-WD.11 2-WD.12 2-WD.13 2-WD.14 2-WD.15 2-WD.16 2468 - Relay Output Board Option 3a-1 3a-2 3a-7 3a-3 3A.2 INSTALLATION3A.1 GENERAL DESCRIPTION 3a-4 3A.2.3 ELECTRICAL INSTALLATION 3a-53a.2.3.1 PCB Interconnections 3a.2.3.2 Relay Output Connections 3A.3 RELAY BOARD CONFIGURATION 3a-6 3A.3.1 RELAY OUTPUT BOARD 3a.3.1.1 Configuring the Relay Output Board3a-7 3a-8 3a.3.2.1 Philosophy 3A.3.2 ALARM AND TRIPPING FACILITIES3a-9 3a-10 3a-11 3a-12 3a-13 3a-14 3A.4 COMPONENT REPLACEMENT 3a-15 3A.5 SPECIFICATION 3a-16 Delay Relay Output Board Option 3b-1 3B.5 SPECIFICATION3b-2 3b-3 3B.2 INSTALLATION3B.1 GENERAL DESCRIPTION 3b-4 3B.2.3 ELECTRICAL INSTALLATION 3b-53b.2.3.1 PCB Interconnections 3b.2.3.2 Relay Output Connections 3B.3 DELAY RELAY BOARD CONFIGURATION 3b-6 3B.3.1 DELAY RELAY OUTPUT BOARD 3b.3.1.1 Configuring the Delay Relay Output Board3b-7 3b-8 3b.3.1.6 Delay Circuit Configuration 3b-9 3b.3.1.7 Configuring the Delay Circuit Split Pads 3b-10 3b-11 3b.3.2.1 Philosophy 3b-12 3b-13 3b-14 3b-15 3b-16 3B.4 COMPONENT REPLACEMENT 3b-17 3B.5 SPECIFICATION 3b-18 2468 Opto-isolatedOutput Board Option 3c-2 IllustrationsTables 3c-3 3C.2 INSTALLATION3C.1 GENERAL DESCRIPTION 3c-4 3c-5 3c.2.3.2 Opto-IsolatedOutput Connections 3C.3 OPTO-ISOLATEDOUTPUT BOARD CONFIGURATION 3c-6 3c-7 3c-8 3c.3.2.1 Philosophy 3C.3.2 ALARM AND TRIPPING FACILITIES3c-9 3c-10 3c-11 3c-12 3c-13 3C.4 COMPONENT REPLACEMENT 3c-14 3C.5 SPECIFICATION 3c-15 3c-16 Remote Display Options 24683B, C, & D Figure 4.1REMOTE DISPLAY OPTIONS 4.2CONFIGURATION 4.2.2RECONFIGURING THE 24683D REMOTE DISPLAY 4.3MECHANICAL INSTALLATION 4.3.2INSTALLING THE 24683D WALL MOUNTED UNIT 4.4ELECTRICAL INSTALLATION comply with the EMC directive Daisy Chain 4.4.1STAR AND DAISY CHAIN CONNECTIONSStar 4.4.2EXAMPLE OF A ‘STAR CONNECTED’ SYSTEM 4.4.3EXAMPLE OF A `DAISY CHAIN SYSTEM 4-10 4.4.4CONNECTING CABLES TO THE REMOTE DISPLAY Service4-11 Terminal 4.4.5CONNECTING THE DISPLAY CABLES TO HYDRASTEP 4-12 4.6FAULT ANALYSIS AND CORRECTIVE ACTION 4.5SYSTEM OPERATIONFault 4-13 Bottom half of fault 4-14 4-15 Flickering Display 4.7COMPONENT REPLACEMENT 4-16Item Mobrey Part Number 4.8SPECIFICATION DIMENSIONSPOWER SUPPLY REMOTE DISPLAY UNITS 4-18 Hydrastep Pressure Parts Operating Manual Pt.2-2 24675030 Part 2 - Pressure Parts Pt.2-3 Pt.2-4 R E M I N D E R ELECTRODE INSTALLATIONCORRECT INCORRECT Pt.2-6 N O T I C E Pt.2-7 Pt.2-8 Part 2 - Hydrastep Pressure Parts Installation ProceduresUnit Specifications - Hydrastep Fault Repair and Commissioning Pt.2-10 General Introduction PRINCIPLE OF OPERATIONWATER LEVEL INDICATION 24675030 24675030 Hydrastep Pressure Parts 1.1PRINCIPLE OF OPERATION 1.2WATER LEVEL INDICATION General Introduction General Introduction Hydrastep Pressure Parts Installation Procedures SCOPE OF PROCEDURESINSTALLATION OF WATER COLUMN STORAGE Installation Procedures 2.1SCOPE OF PROCEDURES 2.3INSTALLATION OF WATER COLUMN2.2STORAGE 2.2.4HANDLING PRECAUTIONS discarded Figure 2.1 - Universal weld profile 2.4INSPECTION OF MECHANICAL INSTALLATION WORK Installation Procedures Figure 2.3 - Typical water column suspension WATER COLUMN COMMISSIONING OR RECOMMISSIONING Fault Repair and CommissioningBACKGROUND Hydrastep Pressure Parts 3.1BACKGROUND 3.1.1SAFETY PRECAUTIONS 3.1.3.1Low Pressure Electrodes 3.1.2WATER COLUMN ISOLATION3.1.3ELECTRODE AND ELECTRODE SEAL LEAKS 3.1.3.2High Pressure Electrodes 3.2WATER COLUMN COMMISSIONING OR RECOMMISSIONING 3.2.1VENT AND DRAIN VALVE REPAIRS 3.2.4WATER COLUMN LIFE 3.2.2WATER COLUMN TRANSIENT RESPONSE3.2.3WATER COLUMN OR PIPEWORK BLOCKAGE Hydrastep Pressure Parts Unit Description Unit Description 4.1LOW PRESSURE ELECTRODES Figure 4.1 - Low pressure electrode 4.2HIGH PRESSURE ELECTRODES Figure 4.2 - High pressure electrode 4.3WATER COLUMN L.P 4.4WATER COLUMN H.P 4.5WATER COLUMN H.P. SUPERCRITICAL 24675030 Unit Specifications - Hydrastep 5.1ELECTRODES Super 5.2WATER COLUMNSSeries Part Hydrastep 2468CA, CB, CC & CDElectronic Gauging System Pt.3-1 Pt3-2 CSA Certified A.1 GENERAL Hydrastep 2468 - Technical Manual Page Appendix A CSA Approval Page Hydrastep Operating Manual