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03-10-18, 11:23 AM | #21 |
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Re: K5 Pointy Headlight Connector Burning out
Passed MOT ok, as have members of the car forum I also lurk on. I think new 2018 MOT regs more about HID bulbs in filament reflector. On an H4 HID bulb the single light source stays in the same ( totally wrong ) place in the reflector and uses a magnetic solenoid shutter to blank off or expose the arc. HID have a totally different reflector shape to filament bulbs and are normally found in projector style headlamps.
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03-10-18, 11:57 AM | #22 |
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Re: K5 Pointy Headlight Connector Burning out
The standard Ultinon LED bulbs are fine, it's just some of the X-treme models that are not legal:
https://www.powerbulbs.com/store/cat...ltinon-led/all |
03-10-18, 12:26 PM | #23 | |
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Re: K5 Pointy Headlight Connector Burning out
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03-10-18, 01:39 PM | #24 | ||||||
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Re: K5 Pointy Headlight Connector Burning out
There appears to be some confusion about electrical behaviour here.
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A vehicle alternator is NOT a fixed power output device. It essentially drives voltage output, which is dependent on magnetic field strength, number of coil turns and speed of rotation. Therefore, in permanent magnet (fixed field) alternators the only variable is engine speed. However, current output is dependent on load demand (within rating - current rating is determined by the coil winding cross sectional area and thermal design of the alternator to get rid of coil losses.) Quote:
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I agree it can be helpful to separate low power control circuits from high power load circuits using relays. Ultimately depends on the rating of the switchgear though. Motorcycle switchgear tends to be ok when new (hence why manufacturers don't add in the complexity of relays etc.), but soon suffers once any sort of real world deterioraton occurs. Hence older vehicles often struggle with poor operation or burning-out of electrical switches or connectors. Cleaning contacts regularly or adding better power wiring/relays is the only way to avoid future burn-out and replacement. (This is probably relevant to the principal enquiry from OP.)
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Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue. RIP SV650 X curvy, crashed and written off December 2019. I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road. |
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03-10-18, 03:39 PM | #25 |
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Re: K5 Pointy Headlight Connector Burning out
The rectifier bit ( 3 phase ) produces heat due to voltage drop across diodes, which is a about 1volt per diode for silicon diode, this is independent of current passing through the diode, so heat produced stays pretty much constant. The output of the rectifier is unidirectional sine waves, not dc, because it has a ripple. The alternator output voltage rises as the load current drops, the regulators job is to try to keep voltage at around 14 volts it does this by drawing current from alternator, the resistance of alternator coils drops the output voltage, this clips the unidirectional sine waves and reduces ripple and produce a low ripple unidirectional voltage. As the alternator rotation speed increase the regulator has to work harder and absorb more current to keep voltage stable, this current causes more heat ( watts ) which is proportional to square of current. The resistance of alternator coils is constant so it needs a constant amount of current drawn to keep output voltage at required value, the more of this current is being drawn by devices ( bulbs, heated grips etc. ) the less current the regulator has to absorb. It is pretty crude but works.
As already posted a car system controls alternator voltage output and keeps it stable against load by reducing excitation of rotor coil, some bikes have this system but SV is not one of them
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2016 SV650 AL7 Courage is resistance to fear, mastery of fear, not absence of fear - Mark Twain Last edited by SV650rules; 03-10-18 at 03:44 PM. |
03-10-18, 04:26 PM | #26 |
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Re: K5 Pointy Headlight Connector Burning out
its a haynes manual.. they are never fully right.
as for showing connectors within wiring diagrams then there are usually none. what suzuki do have a habit of is using parts bins for a number of bikes so the wiring is not always the same as the loom but its usually shown on the proper suzuki workshop manual. having built a few power supplies in my time all i can say regarding R/R's i'm afraid its a case of buy cheep buy twice. |
03-10-18, 05:10 PM | #27 |
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Re: K5 Pointy Headlight Connector Burning out
perhaps the diagram from the Suzuki manual will help. The output voltage from alternator changes with revs (the manual says 60vAC at 5000rpm is correct with it unplugged) this is changed when its rectified but its still too high to use in the bikes electrical system.
The three transistors in the diagram to the right of the bridge rectifier are controlled by the regulator to open sufficiently to allow some current to flow back to the alternator. This drops the output voltage of the alternator as it can only produce so much power (=volts x amps) and now more current is flowing. The transistors present a resistance and as Watts=amps x amps x resistance theres an increase in the power to dissipate as heat. |
03-10-18, 10:08 PM | #28 | |||||||||
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Re: K5 Pointy Headlight Connector Burning out
OK, another long post coming to challenge what I think is some mixed quality theory from others. (All intended to clarify understanding, please don't take offence.)
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Having said all that, I think I may need to experiment! I'm feeling a bit rusty on both my theory and application.
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Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue. RIP SV650 X curvy, crashed and written off December 2019. I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road. |
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03-10-18, 10:47 PM | #29 |
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Re: K5 Pointy Headlight Connector Burning out
I think were talking the same but theres something here I dont agree with:
Those thyristors act as crude crowbars to short circuit across the generator, causing voltage drop because of the internal resistance of the alternator. They're on/off devices and connected parallel to the load, so they operate independently of load current Thyristors/transistors are not on/off devices but variable chokes that are controlled by the regulator depending on system voltage. As you then say the current they let through isnt absorbed by the R/R but generates heat as it passes through the transistors which must be dissipated to avoid damaging them. |
04-10-18, 07:53 AM | #30 | |
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Re: K5 Pointy Headlight Connector Burning out
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A basic thyristor is an on/off device - it can be triggered but will only turn on when it is forward biased, and it will not turn off until voltage across it drops to zero or goes reverse - an igbt thyristor can be turned off by removing gate supply at any time. a device that is in some conductive state other than fully on will dissipate a lot of heat - that is why square wave power supplies are more efficient - the switching device is either fully on or off.
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2016 SV650 AL7 Courage is resistance to fear, mastery of fear, not absence of fear - Mark Twain |
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