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'' '''Recommended flyback for GenBoard/VerThree: DD flyback''' '' [http://vems.hu/www.vems.co.uk/VEMS/InjectorFlyback.html Rob's flyback page] - similar content, more pictures In ancient times, the * high voltage flyback was the recommendation for highZ injectors, when max 2 injectors (preferrably just 1) used per bank * and low voltage flyback for lowZ injectors (or when multiple injectors per bank are used) Since the precise injector opening is configurable (this is a nice feature that not many ECMs have, and no other opensource ECM) usually the low voltage flyback is used also for highZ injectors. In the worst case, there is some adjustment needed (see GenBoard/Manual/Config/InjectorOpening) to smoothen idle if the injector opening parameters were guessed badly originally. ---- * The '''left drawing''' is a '''high voltage flyback''', used only when PWMing is not applied (thus PWM% = 100, recommended for highZ injectors). The '''flyback voltage drop''' is ** '''0.7V + 6.8V''' or ** '''0.7V + 20V''' depending on the type of transient suppression diode used (the 6V8 and 20V are our common values of 0.6kW UNIDIR 1SMB20AT3 ONSemi SMB diode, there are other types of course) * The '''right side drawing is a low voltage flyback''' for lowZ injectors, where PWMing can be applied. The '''voltage drop''' is ** '''0.7V + 0.7V''' for a configuration as on the picture or ** '''0.7V + 0V''' if there is only one diode (or the second is shorted). The 0.7V + 0.7V is preferred by some installers, as the 2nd diode provides protection against the most common (still very rare) failure mode of diodes (when it is shorted) http://www.vems.hu/files/Wiring/DDFlyback.jpg Notes: * '''never have a fuse in the flyback path. The fuse must be outside of the path, as the drawings suggest''' * we recommend using '''separate channels for each injectors''' * if one puts in the transient protection diode with anode on the switched side, he'll not get the left side highZ configuration, but the right side low voltage flyback (0.7V + 0.7V) type * the low voltage type can be used for highZ setup safely, but injection time related parameters are harder to set since injector closing will take longer: * the '''low voltage type is definitely suggested if capability of driving highz or lowz injectors is required without HW change'''. . Recommended low voltage flyback: http://www.vems.hu/files/genboardv3/images/v3.2/v3.2_top_diode.jpg Notes: * check the '''diode direction''' for the low voltage flyback * check where the '''red flyback wire''' (coming from the connector) is terminated: the best connection is '''between 4th and 5th diode''', so 4 flyback paths are on one side and the current from the other 4 flyback flow from the other side of the onboard flyback trace. The reason for this is that the red 0.61mm2 wire can handle much more current with less heating than the PCB trace * [http://www.american.hu/GenBoardv31/GenBoardv31_assembled/GenBoardv3.1_TOP_04.JPG high voltage DD flyback with 0.7V + 6.8V and suboptimal placement of the red wire] * the red wire connects the flyback rail to the EC36 connector, which must be '''directly connected to the injector common (+) with no fuse in between'''. This is done regardless if you're using !HighZ or !LowZ injectors. A fuse is recommended between the supply (main relay) and the injector common (+), but not between the injector common and the onboard flyback trace. See * GenBoard/Manual/Flyback/Testing for how to test flyback. * GenBoard/VerThree/RescueKit to verify what diodes you have ---- Back to GenBoard/Manual/Flyback GenBoard/Manual/Flyback/Calculations GenBoard/Manual
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