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12-04.-2007, 01:23 AM
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#1 |
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Registered User
Join Date: Oct 2006
Posts: 47
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PowerTap Watts Too Low
I have 2 powertaps a standard and a pro cpu with wired harnesses, one is shark fin other is not. Anyway, yesterday on the bike without the sharkfin harness both cpus read really low watts (felt like 300, read 90). I zeroed 4 or five times without any change and then switched bikes in my trainer. Both cpus read normally, and I did my workout. Does anybody know what is up?
Scott |
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12-04.-2007, 01:38 AM
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#2 | |
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Registered User
Join Date: Oct 2006
Posts: 1,506
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Re: PowerTap Watts Too Low
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12-04.-2007, 02:13 AM
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#3 | |
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Registered User
Join Date: Dec 2003
Posts: 238
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Re: PowerTap Watts Too Low
Quote:
I'm confused, do you have 2 different wheels as well? Or, do you have one wheel which you swapped when you changed bikes? If you have one wheel, sounds like a harness problem. If you have 2 wheels, you need to do a bit more troubleshooting to figure out if it's the one wheel or the one harness. "Stomp" tests with all combos of harnesses, cpus, and wheels will reveal all  |
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12-04.-2007, 02:41 AM
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#4 |
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Registered User
Join Date: Sep 2005
Posts: 639
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Re: PowerTap Watts Too Low
Switch the wheels and re-test. The error will be either on the bike(harness or head) or the wheel.
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12-04.-2007, 04:29 AM
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#5 |
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Registered User
Join Date: Oct 2006
Posts: 47
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Re: PowerTap Watts Too Low
Thanks all. Tom, I have 2 wheels and switched the cpus from bike to bike. It makes sense if I switch the bad bike wheel to the good bike and it works, its the harness and otherwise its the hub. Atleast I think it makes sense. Now I am confuse.....
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12-04.-2007, 05:46 AM
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#6 |
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Registered User
Join Date: Dec 2005
Posts: 205
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Re: PowerTap Watts Too Low
I've never seen a receiver change the reported power. When they fail, they just fail. Sounds to me like one of the hubs, since the CPUs report consistently on each hub (i.e. - both low on one, both accurate on the other).
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13-04.-2007, 02:07 AM
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#7 | |
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Registered User
Join Date: Oct 2004
Posts: 974
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Re: PowerTap Watts Too Low
Quote:
you could check the hub bias/offset thru Setup ... Debug or Test mode (check the manual!) . One of the screens there gives you the unloaded reported number from the hub. Should be around 512 but if it goes off significantly from there it can't correct. My m/b PT hub was down around 300-315 last fall and the power simply read around 200W low. Rather disturbing the 1st time it happened!
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rmur |
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13-04.-2007, 02:20 AM
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#8 | |
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Registered User
Join Date: Oct 2006
Posts: 47
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Re: PowerTap Watts Too Low
rmur,
How did you fix it? I didn't have time last night to work on it. Probably won't til Saturday. But, that sounds like the problem. Do I have to send the hub back in as was suggested above? (Noooooooooooooo..............) Scott Quote:
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13-04.-2007, 03:43 AM
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#9 | |
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Registered User
Join Date: Oct 2004
Posts: 974
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Re: PowerTap Watts Too Low
Quote:
aye had to send it back ...
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rmur |
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