Dapu motor info reqd

[stevenatleven]

I am trying to get my KT controller to work with my 250w Dapu M155 hub motor. Some of the wiring on my original Ananda controller melted so I thought I would get a new controller and lcd and increase the Amps from 15 max to 20 and see if that would increase the performance a little as well.
It isn't working, showing no speed and only showing 30/40w of power so i think the P1/P2 settings are the problem.
I have spent a few hours searching for the gear reduction ratio of the motor/the number of poles and finally the magnet number for P2 without success. I have searched this forum and others with specific info but drew a blank so time to ask a question.
Easiest would be if someone knew the P1 & P2 values to set. But any info welcome


Its a new KT 36v 250w to 500w dual mode controller for brushless motors with a max current of 20A and a matching LCD 3, i tried it on a Bafang motor and it worked fine with the proper P1 & P2 values for that particular motor so I know its working ok.

 

[vfr400]

P1 and P2 don't stop the motor from working whatever their value. P2 is probably 1.

When you say it's not working, what do you mean?

 

[Nealh]

From pics I have seen the 155 has six speed magnets so use P2/6.
For P1 try 80 - 100 or there about's the hub has 20 winding magnets, gear reduction may be 4:1 - 5:1 which is pretty normal for Bafang clones.

 

[stevenatleven]

Nealh thanks for the values it gives me something to work from.
vfr400, when i say it isnt working, the LCD powers up normally and when you first turn the pedals it powers up the watts climb up to 200 ish and then it dies off after a few seconds it then continues with almost no power maybe 50 w and no speed indicated.
I'll put these values in, in the morning and report back, thanks

 

[vfr400]

List up all the parameter settings. We'll have to check them.

 

[Nealh]

I know when I swapped the Yose hub wheel to the AKM128c again I forgot to change P1 and for a few miles couldn't figure why it was bit gutless, and wouldn't go above 9.5 mph. P1 for the AKM needed to be 164 and the Yose 84.

 

[stevenatleven]

Thanks for the continuing advice, really appreciate it.
Going to try different parameters this morning.
vfr400 here are the parameters I'm using. Apart from P1 & P2 the only other parameter I am not to sure about is C2 phases.

P1 currently trying 80 to 100
P2 trying 6
P3 0 (no throttle)
P4 0 (no throttle)
P5 15 (for 36v)
C1 2 (pas normal direction)
C2 0 ( Phases ?)
C3 0 ( pas setting )
C4 0 ( no throttle)
C5 10 (max power)
C6 3 ( backlight)
C7 0 ( cruise off)
C8 0 (temp on)
C9 0 (no password)
C10 N (no)
C11 0
C12 4 ( bms default)
C13 0 ( no regen)
C14 2 ( default )

 

[vfr400]

P2 only affects the speed calculation, so you can see whether it's correct on the LCD. You'll know if the speed displayed is a factor of 6 out. Obviousy, if you have 6 magnets and you set it to 1, when you're doung 3 mph, the display will be 18 mph and your 15 mph max speed would cut off if it's set.

 

[stevenatleven]

good info about P2, know a bit more in a few hours.

 

[Nealh]

Is the PAS sensor in use a new one or the old one ?

 

[stevenatleven]

I have been using various settings of P1 from 70 to 120 with no change. Found P2 1 to be the setting for this motor a M155, all the rest are 2/3 mph.
Nealh I am changing the pas sensor for a smaller one as I think you may have a point. It is an old one and I have a newer one that has a better fit.

 

[stevenatleven]

I thought I had found the solution with the C2 setting. All was going well cycled about 10 miles using all the levels, all good. Stopped and switched the bike off while I had a seat for 5 mins. When I switched it back on it wasn't working, no matter how much I played with the parameters I couldn't get it working. It was a bit longer to cycle back home with no lol.
Anyway a few pictures of the PAS sensor for Neal who asked. I'm beginning to think it's a mech thing now. Have tried 12 magnet sensor and an 8, but don't know if that would make a difference. Might try a speed sensor on the rear spoke unless anyone has a better idea. Anyway onwards and upwards.

 

[Nealh]

The PAS sensor orientation could be wrong rotate it so the wire comes from under.
I usually use a 10 pole disc, in the past vfr has mentioned removing every other magnet with the 12 pole disc and that seems to work.
Make sure the sensor/disc gap is about 1mm.

 

[stevenatleven]

The PAS sensor orientation could be wrong rotate it so the wire comes from under.
I usually use a 10 pole disc, in the past vfr has mentioned removing every other magnet with the 12 pole disc and that seems to work.
Make sure the sensor/disc gap is about 1mm.

I'll give that a go in the morning, it feels like it goes for half a turn then dies so that could be it. Also got a 10 pole too so will put that on instead .

 

[Nealh]

The other sensor (not fitted), simply connect it and with the motor wheel off the ground manually waft the disc by it making sure the sensor is at the bottom ( as if fitted to the bike). Try both disc faces if one doesn't work.