Troubleshooting advice

webb1992

Finding my (electric) wheels
Feb 6, 2019
6
0
#1
HI, I'm looking for some advice troubleshooting a fault with my ebike; consisting of a KT LCD3, KT36ZWSRM(36v 11a), 500W rear hub and 36v21ah LI-ION.
Recently its original KT LCD1 stopped working after being caught out in a heavy down poor, after replacing it im getting no readings on the display however the motor does receive power at a noticeably reduced rate dropping even further after 5 minutes or so of heavy load. The battery is giving out 40v.
 
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wheeliepete

Esteemed Pedelecer
Feb 28, 2016
1,220
161
55
Devon/Dorset
#2
Is this the duel power 250/500 watt kit from Cyclotricity? If so, you will only get full power using one of their LCD1 displays with the extra setting. Using a LCD3, you are only getting 250 watts.
 

webb1992

Finding my (electric) wheels
Feb 6, 2019
6
0
#3
thanks for the quick reply, it is indeed but when i say reduced power i mean almost negligible not comparable to 250w
 

wheeliepete

Esteemed Pedelecer
Feb 28, 2016
1,220
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#4
When you say your battery is giving out 40v, is this straight after charging?
 

webb1992

Finding my (electric) wheels
Feb 6, 2019
6
0
#5
yes the Battery had been fully charged prior to the original lcd failing and i've had no way to discharge it.
 

wheeliepete

Esteemed Pedelecer
Feb 28, 2016
1,220
161
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Devon/Dorset
#6
If your new display is blank, then the problem may be with the controller. Check all the connections are good. Do you have PAS and throttle?
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
6,947
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West Sx RH
#7
KT programming has a C setting for different screens as you had lcd1 it was set for C11 &1, for lcd3 set the value to 0 and see if that helps.

The downpour though may have affected the controller if moisture got it at all.
 

webb1992

Finding my (electric) wheels
Feb 6, 2019
6
0
#8
No throttle just pedal assist, also the lcd powers off after 5 minutes so i assume there is no communication between the motor and the lcd. ill reassemble it and give it a another test.
 

Nealh

Esteemed Pedelecer
Aug 7, 2014
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West Sx RH
#9
Lcd receives comms/voltage via the controller along the TX/RX lines, the controller then sends power to the motor.

The fault is between battery - controller- lcd, though try changing C11 first to value 0.
 

webb1992

Finding my (electric) wheels
Feb 6, 2019
6
0
#10
c11 is already set to 0 sadly
 

wheeliepete

Esteemed Pedelecer
Feb 28, 2016
1,220
161
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Devon/Dorset
#11
Can you toggle through the PAS levels while the LCD is on?, the low power may be due to being stuck on level 1.
 

webb1992

Finding my (electric) wheels
Feb 6, 2019
6
0
#12
i can toggle through them however they do not affect the level of assist, 0 is also giving power
 
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wheeliepete

Esteemed Pedelecer
Feb 28, 2016
1,220
161
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Devon/Dorset
#13
It would seem there is a comms problem between LCD and controller. It's worth checking none of the pins have pushed out of the LCD/controller connector, esp. the RX/TX wires, green and yellow.
 

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