ABB 2600T Series Operating Instruction

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ABB 2600T Series Operating Instruction Manual pdf 15 page image

- 15 -WARNING - For installation in Hazardous Areas,i.e. areas with danger of fire and/or explosion, prior tomaking electrical connections, ensure compliance withsafety information on the Safety Marking plate. Failure tocomply with this warning can result in fire or explosion.Signal terminals are located in a separate compartment of thesecondary unit housing. The housing incorporates two con-nection ports for cable glands or conduit fittings. They areprotected with a temporary plastic plug for transit purposewhich should be replaced with a suitable permanent plug in theunused port. Connections can be made by removing the cover(indicated in Fig. 7); first screw down the locking screw locatedbelow the cover, using a 3 mm Allen Key.WARNING - For Hazardous Areas installations,theconnection of cables and conduits to the transmitter shallbe made in accordance with the requirements of therelevant type of protection. Cables and cable-glands mustbe in accordance with the type of protection.Unused openings for connection shall be closed withblanking elements suitable for the relevant type ofprotection. With the exception of intrinsically safetransmitters, the means provided for this shall be such thatthe blanking element can be removed only with the aid oftools. The blanking elements must be certified for the typeof protection. See standards either EN 60079-14 or IEC79-14. The transmitter connections must also guaranteethe degree of protection of the transmitter enclosure, e.g.IPxx according to EN 60529 standard (or IEC529). Seealso the Addendum for "IP" protection (and Ex Safety)which is part of this instruction manual.The signal cable should be connected to the terminals markedrespectively (+) and (-). If an internal output meter - either withanalog or digital indication - is installed, it should be removedin order to make the connection, simply by pulling it out from itssocket. After the connections have been made, reinstall theoutput meter. Refer to the Meters Option addendum fordetails.The power to the transmitter is supplied over the signal wiringand no additional wiring is required. The signal wiring does notneed to be shielded but the use of a twisted pair is highlyELECTRICAL CONNECTIONSrecommended. The cable shield should be grounded in oneside only, to avoid dangerous earth paths.WARNING - For Hazardous Areas installations,when the ambient temperature is higher than 70°C, thecable used for the connections must be suitable for 5°Cabove the ambient temperature.Normal practice is to ground in the control room side, in whichcase the field side of the screen should be adequatelyprotected to avoid contact with metallic objects. Signal wiringmay be ungrounded (floating) or grounded at any place in thesignal loop, but for intrinsically safe installations the wiring andgrounding must follow the specific rules for this technique. Thetransmitter case may be grounded or ungrounded: a groundconnection is provided internally (in the terminal compartment)and externally.Do not run the signal wiring in close proximity to power cableor high power equipment; use dedicated conduits or trays forsignal wiring.CAUTION - Do not connect the powered signalwiring to the mA signal testing terminals as this coulddamage the by-pass diode.After the connections have been completed check the integrityof the cover O-ring, screw down the cover and secure it byunscrewing the safety screw.CAUTION - Unless absolutely necessary, avoidthe removal on site of the protective cover which givesaccess to the electronic circuitry. Although the electro-nics are fully tropicalized they should not be subjectedto humidity for long periods.WARNING - For Hazardous Locationinstallations, at least eight (8) threads on each covermust be engaged in order for the transmitter to meet(FLAME PROOF - explosion-proof) requirements.Fig. 7 - Location of the locking screws and terminalsGrub screwSecondary UnitCover lockingscrews (in theposition indicatedby the arrows)Primary UnitRemove thiscover toaccessterminals MTEST COMMHand Held CommunicatorTerminalsTest TerminalsOutputMeterSocketGround TerminalSignal TerminalsFig. 8a - Terminals arrangementsShortcircuit link