(see JL2 comments x17 )
JL2- Firstly, thanks for the effort you've put into this post, it really IS appreciated & gosh! What a relief to be conversing with somebody who does NOT suffer from "short attention span"! - Not only that, unlike a LOT of others, you aren't screeching & me for breaking away from the conventional linear "block comprehension" style as taught @ school. I find it inadequate for complex - technical discussions ( it allows you to put comments EXACTLY where you want them,
[ thus allowing you to escape from overloading your cortex by trying to synthesise long complex conversations all @ one go. then find you've missed out bits & have to rehash the conversation all over again. with this way, you simply put in a later numbered comment, again EXACTLY where you want it. - It REALLY does make life a LOT simpler ! ] & if a conversation progresses with both [ or more ] people using the system, you can end up with your comments inside the other person's comments, or vice versa. And if I get as far as JL10 comments, by that time the conversation has gone far enough to retitle it & revert back to JL comments. The reason some people can't cope with this system seems simply to be they've been negatively conditioned into staying inside the conventional system. Which doesn't seem to apply to you, which makes life easier on me, especially as now I'm so used to it, I prefer to use it all the time.
author=James P link=topic=3212.msg35765#msg35765 date=1439712340]
Jim,
To address your questions in order:
Although reports from TZR owners are nowhere near as numerous as those from KR-1/1S owners, excessive voltage has the potential (pardon the pun!)
JL2 - You're forgiven. as I've seen much worse in my time.
to damage things like CDI units, YPVS controllers and motors, tachometers etc.
JL2 -Yikes, that's a long enough list to make a comparitively poor person like me to sit up & pay attention!
Several KR1/1S owners have reported their tacho failing, closely followed by the CDI unit. The stators on the KR-1/1S and the 1KT-based TZR are nearly identical, so I can only presume that the same danger exists for the TZR.
JL2 - For the cost & negligible weight of a voltmeter, I think I prefer to err on the side of caution.
I fitted the block connector because it makes connecting and disconnecting easier, without putting strain on the wires. I haven't spliced into the loom - I just made an "extension lead" from the battery terminals to the instrument panel area. Since I haven't got a battery, the voltmeter only indicates when the engine is running. If you have got a battery and use this same set-up,
JL2 - At present I've got a battery, but when I eventually get my act together, I'd like to change over to a capacitor. In the UK the legal position is that when you take a vehicle for its yearly MoT
( Ministry of Transport ) test it's a legal requirement that the indicators work with the engine off. So that requires a battery, but you can use a capacitor for the rest of the year ! - So that's the situation I want to work around.
the voltmeter will always be switched on - that's why I suggested wiring the voltmeter positive terminal to the "load" side (read on for explanation) of the ignition switch - so the voltmeter will only be switched on when the ignition is on.
It seems that most regulators keep the stator output voltage down to about 13-15V.
JL2 - So anything over 15 V is a problem?
Without the regulator, the output voltage could be 60V or more at high engine speeds. My own experience suggests that when regulators fail, they just stop regulating, meaning that the voltage is no longer limited. I have not actually observed a regulator going from good to bad, but I imagine it happens in a matter of seconds (or minutes at the most).
Of course, some regulators fail in a different manner (i.e. the voltage may be reduced too much). While this probably won't damage any components, it will allow the battery (if you've got one) to drain without being recharged (with no battery, the voltage may be too low to allow things operate properly).
If the regulator fails in the usual manner (i.e. stops regulating), your only chance of limping home without damaging anything is to keep the engine speed very low (perhaps 2500rpm or less!). Of course, this only works if you are aware that the regulator has failed.
JL2- IIRC, nowadays a voltage rectifier-regulator is a combined unit? Previously, if i went any long distance, I'd carry a spare 2nd hand CDI "black box" ( that I'd "proved" by means of swopping it over & giving it a functional test ). But now I think I'll add a voltage regulator-rectifier to my tank bag contents?
Many electronic components will tolerate over-voltages for a certain amount of time, but not indefinitely.
Regarding the size of capacitor; I haven't yet determined the optimum size.
JL2 - Optimum is my VERY favourite place to be!
So, if you ever get to know better, I'd appreciate an update, if you would?
Popular opinion suggests anywhere from a few thousand microfarads to a few tens of thousands. My TZR has one 10000uF unit, whereas my KR-1 has three of these in parallel for 30000uF and both of these seem generally satisfactory. Perhaps the more important rating is the voltage rating. Electrolytic capacitors do not survive for long on sustained over-voltages and tend to explode. Therefore, I would err in favour of a higher voltage rating (e.g. 30-40V).
JL2- So, 30-40V, & presumably in 10,000uF capacity ( because that's what's generally available? ) units X 3 & wired in parallel? If a capacitor is an electrically acceptable replacement for a battery, just how far is it similar to a battery? e.g. one wire only is the positive & earth through a metal strap around the body of the capacitor?
Most bikes with self-generating magnetos (but still needing 12V DC for CDI/YPVS operation etc.) could probably use a capacitor instead of a battery.
JL2- I'm mainly looking for a substantial weight loss, but if it's also cheaper to buy & maintain, then those are extra +'s.
Regarding the phrase "load side of the ignition switch"; In electrical terms, "line" and "load" are synonymous with input and output, upstream and downstream etc. In the context under discussion, I am suggesting that (if you have a battery),
JL2- From my comment above about the legal requirements of a yearly MoT, it looks like I need a system compatible with both battery & capacitor.
the voltmeter would be better connected to any 12V DC supply wire which only becomes live when the ignition switch is on. If you just connect the voltmeter across the battery terminals, it will always be turned on.
JL2 -Fair point, there's nothing to be gained from wearing the voltmeter out by having it permanently on, & less load on the battery if permanently fitted ( & it seems desirable to break free from batteries ).
The negative/earth terminal of the voltmeter may be connected to any convenient earth wire or to the frame.
JL2- Good, as that makes life easier.
I think these miniature voltmeters all come from Asia,
JL2 - From comments on evil bay implying that, it seems likely.
so it should just be a matter of searching Ebay to find the same item in UK or wherever else. There may also be sellers at the source in Asia who will send direct to other countries. For instance:
http://www.ebay.co.uk/sch/i.html?_odkw=mini+led+voltmeter&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xmini+led+voltmeter+waterproof.TRS0&_nkw=mini+led+voltmeter+waterproof&_sacat=0JL2 - Thanks for that.
I hope I've explained things a little better
JL2 -Your explanation is very good & I'm happy with it.
- let me know if anything is still unclear.
JL2 - Where do you source your capacitors - evil bay?
As I'm likely to end up with a dual system where I use a capacitor most of the time & once a year change over to a battery for the MoT test, is there anything else I need to consider?
Regards, Cheers,
James Jim