Danfoss ECL Comfort 296 Service Manual
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- Operating manual (159 pages) ,
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Service Guide
ECL Comfort 296 / 310 controllers
Modbus networking guide
1.0 Contents
1.0 Contents... . ................................................................................................................................................................................................................................................1
2.0 Introduction .............................................................................................................................................................................................................................................2
3.0 Conclusion ... .............................................................................................................................................................................................................................................2
4.0 Modbus network definitions .............................................................................................................................................................................................................3
4.1 Multipoint serial bus infrastructure .......................................................................................................................................................................................3
5.0 ECL 296 / 310 Modbus network specification .............................................................................................................................................................................4
6.0 Installation class and surge / lightning protection ....................................................................................................................................................................5
7.0 Annexure A: Modbus network wiring guidelines ......................................................................................................................................................................6
7.1 Central heating station ................................................................................................................................................................................................................7
7.2 Repeater stations (individual houses with repeater) .......................................................................................................................................................8
7.3 Individual houses (without repeater) ....................................................................................................................................................................................9
8.0 Annexure B ............................................................................................................................................................................................................................................ 10
8.1 Selection of parts ........................................................................................................................................................................................................................10
8.2 Surge protector wiring..............................................................................................................................................................................................................11
8.3 "Modbus" to "mains" separation ...........................................................................................................................................................................................12
© Danfoss |2017.06
VI.LV.H1.02 | 1
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Summary of Contents for Danfoss ECL Comfort 296
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Page 1: Table Of Contents
Service Guide ECL Comfort 296 / 310 controllers Modbus networking guide 1.0 Contents 1.0 Contents..................................................1 2.0 Introduction ................................................2 3.0 Conclusion ................................................2 4.0 Modbus network definitions ..........................................3 4.1 Multipoint serial bus infrastructure .......................................3 5.0 ECL 296 / 310 Modbus network specification .....................................4 6.0 Installation class and surge / lightning protection ..................................5... -
Page 2: Introduction
ECL 296 / ECL 310 Modbus 2.0 Introduction In smaller district heating networks ligthning can be a challenge for the connected devices like ECL Comfort 296 / ECL 310 controllers. If not protected, Modbus interfaces are subject for being burned in case of lightning. -
Page 3: Modbus Network Definitions
A multipoint Modbus serial line bus is made of a principal cable (the trunk) and possibly some derivation cables. Line terminations are necessary at each extremity of the trunk cable for impedance adaptation. VI.LV.H1.02 © Danfoss | 2017.06 | 3... -
Page 4: Ecl 296 / 310 Modbus Network Specification
2) = repeater 3) = line termination (LT) If the ECL is used in the extremity node of the trunk cable, connect an external line termination (150 ohm / 120 ohm, 0,5 watts resis- tor). VI.LV.H1.02 4 | © Danfoss| 2017.06... -
Page 5: Installation Class And Surge / Lightning Protection
(repeater / ECLs) to the network, must be connected to the “protected side” of the “external surge protection device) VI.LV.H1.02 © Danfoss | 2017.06 | 5... -
Page 6: Annexure A: Modbus Network Wiring Guidelines
Each nodes in the Modbus network (central heating station, repeater station or individual house) can have “surge protector”. Top level logical drawing: central heating station surge protector individual house W/O repeater repeater repeater station VI.LV.H1.02 6 | © Danfoss| 2017.06... -
Page 7: Central Heating Station
(S.Gnd) and shield cable to be maintained (Refer section 5 point 5, 6). Dot on the intersection lines (S.Gnd, Earth) means that those two signals are electrically shorted. Surge suppressor connection should match as in section 8.2. VI.LV.H1.02 © Danfoss | 2017.06 | 7... -
Page 8: Repeater Stations (Individual Houses With Repeater)
5 point 4.a Internal termination of repeaters is switched OFF if the connec- tion matches with section 5 point 4.b 1) = surge protector 2) = repeater 3) = line termination (LT) VI.LV.H1.02 8 | © Danfoss| 2017.06... -
Page 9: Individual Houses (Without Repeater)
(As shown above). This is to maintain single point earthing in each network, on common reference signal (S.Gnd) and shield cable (Refer section 5 point 5, VI.LV.H1.02 © Danfoss | 2017.06 | 9... -
Page 10: Annexure B
• PT 1x2-BE - signal ground (pin 9/10) is shorted to PE (protective earth) (3/4) • PT 1x2+F-BE - spark gap between signal ground (pin 9/10) to PE (protective earth) (3/4) PT 1x2-BE PT 1X2 +F-BE VI.LV.H1.02 10 | © Danfoss| 2017.06... -
Page 11: Surge Protector Wiring
• 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 before making connection”. VI.LV.H1.02 © Danfoss | 2017.06 | 11... -
Page 12: Modbus" To "Mains" Separation
1. Even for a short distance well separated (≥ 7mm) from mains signal. 2. Mains signal must be grouped separately and clear distance is maintained throughout the cable routing (from surge protected signal to ECL 296 / 310 wiring) VI.LV.H1.02 12 | © Danfoss| 2017.06... - Page 13 Service guide ECL 296 / ECL 310 Modbus VI.LV.H1.02 © Danfoss | 2017.06 | 13...
- Page 14 Service guide ECL 296 / ECL 310 Modbus VI.LV.H1.02 14 | © Danfoss| 2017.06...
- Page 15 Service guide ECL 296 / ECL 310 Modbus VI.LV.H1.02 © Danfoss | 2017.06 | 15...
- Page 16 Service guide ECL 296 / ECL 310 Modbus *087H9289* *VILVH102* VI.LV.H1.02 16 | © Danfoss | DHS-SMT/DK | 2017.06...