Stupid ?


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squirrel
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Stupid ?

Post by squirrel » Sun Mar 11, 2018 5:11 pm



So .I'm recovering from a broken clavicle 5 weeks so far .bored so bored .anyway put a new battery in the bike .not thinking straight fitted back to front sparked .now no power at all .checked fuses under tank all good I'm blaming the drugs ,can't ride it anyway. Hoping it's the fuse from battery to solenoid but can't undo it as I don't have the strength but could it be anything else ..thanks



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virgilmobile
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Re: Stupid ?

Post by virgilmobile » Mon Mar 12, 2018 6:54 am

Sorry bout that.
Do check the 30 amp fuse in (at) the starter solenoid.
The fuse should have blown.Keep in mind that (with a bit of luck) replacing the fuse and getting the battery right may fix this but the regulator module is tied directly to that fuse along with any "keep alive" circuit.
This would include a clock,radio,trip computer,etc.
These components really don't like reverse polarity.
If replacing the fuse just blows again,first unplug the regulator.

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AZgl1800
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Re: Stupid ?

Post by AZgl1800 » Mon Mar 12, 2018 3:44 pm

hoping your experience comes out, no harm done.

but in the past, I have had to repair a lot of radios that saw reverse voltage for the briefest of times while the fuse makes up its' mind to blow.. and that us usually way too late for electronics.

just be glad that bike does not have computer operated Fuel Injection.... you would be buying a new cpu.

IMO,
Honda erred in that they did not include a very heavy, 50 amp Reverse Diode protection behind the fuse....
That is how all expensive electronics are protected.
That diode will conduct instantly shorting the fuse to ground.
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WingAdmin
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Re: Stupid ?

Post by WingAdmin » Mon Mar 12, 2018 5:37 pm

AZgl1800 wrote:
Mon Mar 12, 2018 3:44 pm
hoping your experience comes out, no harm done.

but in the past, I have had to repair a lot of radios that saw reverse voltage for the briefest of times while the fuse makes up its' mind to blow.. and that us usually way too late for electronics.

just be glad that bike does not have computer operated Fuel Injection.... you would be buying a new cpu.

IMO,
Honda erred in that they did not include a very heavy, 50 amp Reverse Diode protection behind the fuse....
That is how all expensive electronics are protected.
That diode will conduct instantly shorting the fuse to ground.
Agreed, the inclusion of that 50 cent component to protect a circuit, particularly one that is quite easy to apply reverse voltage to, is a major omission. I include that diode in every circuit I design. It's cheap insurance.

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Rednaxs60
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Re: Stupid ?

Post by Rednaxs60 » Mon Mar 12, 2018 6:30 pm

Interesting having a diode for reverse current protection. Not one on my FI bike. Is there a schematic showing this? Would like to consider this as well. Cheers
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Re: Stupid ?

Post by WingAdmin » Tue Mar 13, 2018 9:25 am

Rednaxs60 wrote:
Mon Mar 12, 2018 6:30 pm
Interesting having a diode for reverse current protection. Not one on my FI bike. Is there a schematic showing this? Would like to consider this as well. Cheers
It's not a difficult thing to do. A diode only passes current in one direction, and blocks it in the other direction. So the diode is installed across the power lead for the device being protected:





When the power is applied correctly, everything works normally. Because the diode won't allow current to flow backwards, the current instead flows into the protected device as normal.

If power is applied backwards, the diode conducts with almost no resistance. This allows a large amount of current to flow (limited only by the diode itself). This large amount of current is shunted through the diode instead of into the protected device, and because of the almost complete short, it quickly blows the fuse that protects the entire circuit.

You could possibly also blow the diode in the process - depending on the size of the fuse, how long the fuse takes to blow, etc. - but it's far cheaper to replace a 50 cent fuse than the entire device it is protecting.

You can also do the same thing with a zener diode. A zener diode works like a regular diode, except it only blocks reverse current up to a specified voltage, then it conducts normally. If you put an 18 volt zener diode in the circuit, it will protect against reverse polarity, and it will also protect against overvoltage - if the input voltage hits 18 volts, the zener diode conducts, shorting the circuit and blowing the fuse:




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virgilmobile
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Re: Stupid ?

Post by virgilmobile » Tue Mar 13, 2018 3:21 pm

All above information is common practice in the low power circuits I work with.
Protecting the bike from reverse polarity battery power would need a very large rated diode (as mentioned) to blow a 30 amp main fuse.
Reverse polarity a 1 amp diode with a 30 amp source will simply vaporize (violently explode)the diode and not blow the fuse.You would need one that's rated closer to the fuse size.
They don't call me "Sparky" for nuthin :shock:
Hey.. somebody has to try this out.

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Re: Stupid ?

Post by WingAdmin » Tue Mar 13, 2018 5:30 pm

virgilmobile wrote:
Tue Mar 13, 2018 3:21 pm
All above information is common practice in the low power circuits I work with.
Protecting the bike from reverse polarity battery power would need a very large rated diode (as mentioned) to blow a 30 amp main fuse.
Reverse polarity a 1 amp diode with a 30 amp source will simply vaporize (violently explode)the diode and not blow the fuse.You would need one that's rated closer to the fuse size.
They don't call me "Sparky" for nuthin :shock:
Hey.. somebody has to try this out.
I should have mentioned that - the diode should be sized higher than the fuse that is protecting the circuit. Like twice the size is a good start.

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squirrel
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Re: Stupid ?

Post by squirrel » Fri Mar 16, 2018 12:31 pm

Thank you all for your help,i replaced the main glass fuse by the solenoid with a 30 amp blade fuse and she lives again .many thanks



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