Danfoss ECL Comfort 296 Service Manual

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Contents

Danfoss ECL Comfort 296 Service Manual Manual pdf 11 page image

© Danfoss | 2017.06 | 11VI.LV.H1.02Service guide ECL 296 / ECL 310 ModbusSite 1 Site 2PT 1x2-BE PT 1x2-BECommon signal shorted with PE (protective earth) Common signal shorted with PE (protective earth)BUT common signal must be connected to earth ONLY ONE POINT (section 5 point 5).So use “PT 1X2 +F-BE” and avoid “PT 1x2-BE”.8.2 Surge protector wiringThe correct wiring is equally important to get the best “surge protec-tion in the network level.PT 3-PB-ST and PT 1X2+F-BE logical drawing:The “gas discharge tubes” (between pin 7, 6 to 9 in the juxtaposedexample) is capable of handling higher surge current, but this deviceis slow responding.The “transils” (between pin 8 to 12 and 10) are capable of handlinglow surge current, but very fast responding. These two sets of com-ponents (gas discharge tubes and transils) are separated by a resistorwhich forces the surge to be first suppressed by the gas dischargetube and the residue will be suppressed by the transil in the properinstallation (“field cables” to “gas discharge connection points” and“electronics to be protected” are connected to “transil connectionpoints”).3-wire, PROFIBUS (up to 12 MHz)Total width 17.7 mmRefer the juxtaposed drawing for example.• Odd numbered connection of PT 1X2+F-BE meant for outer filedcables (both IN and OUT cable wires of field cable)• Even numbered connection of PT 1X2+F-BE meant for repeater/ECLs wires (both IN and OUT cable wires of ECLs / repeaters)“Base part and surge protector data sheets must be referred beforemaking connection”.Cable to next house