KT-LCD3 display - speed report wrong
KT-LCD3 display - speed report wrong
I just installed a KT36/48VPRL controller with a compatable KT-LCD3 display driving a Crystalyte 408 front hub with 54V. The speedometer function is calibrated with a setting for wheel diameter (26,700c,28,29) and P1 (Motor characteristic parameter setting) where P1= motor gear reduction ratio x number of magnets. The 408 has 18 magnets and is a direct hub. The manual says P1 can be 1 to 255. I should use P1=18, but it will not keep any setting below 20. At 20 the report is about 10% low (even using 29 diameter). Any one have a fix or an idea get a more accurate speed and distance report?
Re: KT-LCD3 display - speed report wrong
One solution is to get an external sensor, and the controller will ignore those other settings beside wheel size, although I've seen a couple a threads describing a systematic version of trial and error with P1 combined with other settings.Firedog wrote: ↑May 17 2019 6:47pmI just installed a KT36/48VPRL controller with a compatable KT-LCD3 display driving a Crystalyte 408 front hub with 54V. The speedometer function is calibrated with a setting for wheel diameter (26,700c,28,29) and P1 (Motor characteristic parameter setting) where P1= motor gear reduction ratio x number of magnets. The 408 has 18 magnets and is a direct hub. The manual says P1 can be 1 to 255. I should use P1=18, but it will not keep any setting below 20. At 20 the report is about 10% low (even using 29 diameter). Any one have a fix or an idea get a more accurate speed and distance report?
I could get the speed close, but couldn't match my GPS until I added the external sensor.
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Re: KT-LCD3 display - speed report wrong
You could use 180, then just keep in mind the decimal will just be off by one. 
Alternately, you could look up the open-source firmware for the KT and LCD3 by Casainho / stancecoke / etc; there's a few threads and it's a lot of reading, but I understand it's much more configurable than the default firmwrae.
Alternately, you could look up the open-source firmware for the KT and LCD3 by Casainho / stancecoke / etc; there's a few threads and it's a lot of reading, but I understand it's much more configurable than the default firmwrae.
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"if it ain't broke, improve it till it is"----Dog-Hauler Cargo eTrike SB Cruiser----The HI-Lebowski: a Lebowski SMD brain running a zombified Honda IMA Inverter: a HOW-TO guide----Cargo eBike CrazyBike2----General Blog
Re: KT-LCD3 display - speed report wrong
Thank you!couldn't match my GPS until I added the external sensor
Instead of ordering and waiting for a external speed sensor, I pulled a PAS sensor and an old spoke magnet out of my parts bid. It works perfectly.
I set up this tandem to use a Crystalyte 5303 or a much lighter 408. A 5 minute swap. The speed sensor rpm input means I don't have to reprogram the display after a change. Nice
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