TTDMâNMM and - California Detection Systems

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Appendix 4 – Maintenance Cleaning the Module To clean the outside surface, use a damp cloth or sponge. Do not use solvents or abrasive cleaners and do not open the enclosure while it is wet (it is an electrical device). Fuse Replacement The fuse on the power supply board of the TTDM-NMM and TTDM-SIM units is a 200-mA, 250-V, quick-acting microfuse. It has an F1 rating, characteristic code F (quick-acting). Use no other type of fuse or the TTDM could be damaged or could fail to perform properly. Routine Maintenance It is recommended that the TraceTek system be thoroughly checked twice a year. Such a check will identify conditions that adversely affect the leak-locating capability of the system. More frequent checks may be required if the sensing cable is repeatedly exposed to leaks, or may be exposed to abuse due to construction or repair work. Contact your local Raychem TraceTek representative for further information on service support. Storage and Handling of Sensing Cable Despite their rugged construction, TraceTek sensing cables must be handled in a manner appropriate for a sensing device or they may be damaged and require replacement. Therefore, you should follow some basic rules for storing and handling all TraceTek sensing cables: • Store spare cable in its original container in a clean, dry place until ready for installation. • Schedule cable installation after all mechanical, plumbing, and electrical work has been completed. • Clean the area where the cable is to be installed, and remove any obvious debris or other sources of contamination. • Do not solder or weld near the cable without providing protection from heat, solder flux, or weld splatter. • Do not drop tools or floor tile on the cable; sharp or heavy objects may damage the cable. • Avoid walking or stepping on the cable. Provide shielding (for example, a half shell of plastic pipe) where additional protection is necessary. • Do not use tape to secure sensing cable (some tapes and adhesives absorb moisture) or use solvents that could eventually cause an alarm. • Do not drag sensing cable through contaminants (such as pipe dope, PVC cement, solvents, oil, or dirt). Investigating Leaks and Faults If the location of a leak is not apparent, it is often useful to subdivide the leak detection circuit. To accomplish this, it is best to have a TraceTek Portable Test Box (PTB) or extra Sensor Interface Module, and an extra Modular End Termination. Contact your locate TraceTek representative to obtain these products. To subdivide the system and isolate the problems, find a connection at a convenient point somewhere at the center of the detection circuit. You can then use a PTB or add an additional TTDM-SIM to test the “back half” of the sensing circuit (to verify circuit integrity, and to detect the presence of liquid and determine its location). If you install an end termination on the “front half” of the circuit (going back to the existing module), you can use that module to check the “front half” of the sensing circuit. If you add a new SIM to the leak detection network (by connecting it to the RS-485 wiring connected to the TTDM-NMM), use the SIM Network menu and select Update Network to add the new SIM to the existing network. Examine the SIM Status of the new (“front half”) and old (“back half”) channels, and compare with the SIM Status of the former combined sensing circuit. You can further subdivide the circuit, and even test individual lengths of cables. Even the most perplexing problems can usually be isolated and resolved using this methodical approach. If you wish to remove SIMs, remember to use the Init Network menu. Alarm and locating module End termination SIM (or PTB) End termination End termination End termination PTB (or SIM) 26
Appendix 5 – Connection of TTDM-SIMs to RS-485 Network Leak Detection Network of TraceTek TTDM-NMM and TTDM-SIMs In a network of TTDM-NMM and up to 15 TTDM-SIM modules, each TTDM-SIM Sensor Interface Module can independently monitor up to 5000 ft (1500 m) of sensing cable. The SIMs communicate with the TTDM-NMM Network Master Module (which provides the user interface) via an RS-485 network, as illustrated below. TTDM-SIMs are daisy-chained with RS-485 wiring (shielded cable with a twisted pair of wires 22 AWG or larger); the RS-485 wiring may have a total length of 4000 ft (1200 m). RS-485 Wiring for Connection of SIM Network To build the RS-485 leak detection network, connect the pair of wires in the RS-485 cable to connector J10 on the motherboard of the TTDM-NMM and TTDM-SIMs (feature 21 in the diagram on the inside front cover). PL RS-485 EXT XMTRS 1 J10 Factory-installed jumpers PL RS-485 EXT XMTRS 1 J10 PL PL RS-232/485 EXT COM PORT 4-20MA OUT PORT 1 J13 1 J2 1 SERVICE 5A 25 J6 TTDM-NMM Network Master Module +51SO ICOM 485+ 485– 1 2 3 4 RX/A TX/B RTS CTS +5V GND 5 6 7 8 9 10 IRTN IOUT +V +VRTN 11 12 13 14 NC NO COM 15 16 17 RS-485 2-wire network TTDM-SIM Sensor Interface Module +51SO ICOM 485+ 485– 1 2 3 4 In the TTDM-NMM • Connect the one wire of the RS-485 cable to pin J10-3; this wiring defines + polarity for the network. • Connect the other wire of the RS-485 cable to pin J10-4; this wiring defines – polarity for the network. • Connect and secure the shield of the RS-485 cable to the chassis ground/earth stud (feature 14 in the diagram on the inside front cover) In Each TTDM-SIM There will be both incoming and outgoing RS-485 cables unless the SIM is the last in the network string. • Connect the + wire of each RS-485 cable (per polarity defined by connection in NMM) to pin J10-3. • Connect the – wire of each RS-485 cable to pin J10-4. • Splice the shields of incoming and outgoing RS-485 cables to each other. Do not connect the cable shields to the chassis ground/earth in each SIM (variations in ground potential can generate spurious currents). Note: Do not connect and power more than one new SIM on the network without assigning each SIM a unique address (see next page for details). For guidance on the most practical approach to configuring the SIM network for your application, call (800) 553-1737 or (650) 361-4900 and request technical assistance. Note: Do not exceed 4000 ft (1200 m) of interconnecting RS-485 cable. PL RS-485 EXT XMTRS 1 J10 +51SO ICOM 485+ 485– 1 2 3 4 TTDM-NMM 14 TTDM-SIM Splice of cable shields RS-485 +51SO ICOM 485+ 485– Next SIM In last SIM, cable shield is not connected RS-485 +51SO ICOM 485+ 485– Shield Shield Twisted pair 27
Page 1 and 2: R TraceTek TTDM-NMM and TTDM-SIM Le
Page 3: Contents Overview Identifying TTDM-
Page 6 and 7: Description of TraceTek Leak Detect
Page 8 and 9: Connection of TraceTek TTDM-NMM Sys
Page 10 and 11: Current Event/Status Display (Norma
Page 12 and 13: Leak Detection and Location Events
Page 14 and 15: Fault Events Introduction Several c
Page 16 and 17: Should the leak continue to spread,
Page 18 and 19: Status of Individual SIM Channels T
Page 20 and 21: Events History Log One extremely us
Page 22 and 23: General Setup Access the General Se
Page 24 and 25: SIM Network Access the SIM Network
Page 26 and 27: Self-Test The Self-Test menu provid
Page 28 and 29: Appendix 2 - Events Glossary Type o
Page 32 and 33: Assigning a SIM Address When a TTDM
Page 34 and 35: 4-20 mA Output Signals The TTDM-NMM
Page 36 and 37: Configuration and Testing of Serial
Page 38 and 39: Selecting RS-485 vs. RS-232 Communi
Page 40 and 41: TTDM-NMM Data Structure for Modbus
Page 42 and 43: SIM Channel Status The TTDM-NMM off
Page 44 and 45: Digital Inputs — Alarm Relay/LED
Page 46 and 47: Input Registers — SIM Status Data
Page 48 and 49: Holding Registers — Module Setup
Page 50 and 51: R R Appendix 8 - TTDM-NMM Network M
Page 52: www.raychem.com cheminfo@raychem.co

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TTDMâNMM and - California Detection Systems