dialing_wand
New Member
- Region
- Canada
- City
- Saint John, NB
I'm hoping someone with some experience tweaking settings can help out.
I recently completed a Grin build with a Phaserunner V6, GMAC 8T and a 23Ah 52v battery (~50A continuous BMS circuit), in also has a torque sensing bottom bracket.
I'm having an issue where, from a stop, in certain conditions, there is either no power to the motor after starting from a standstill, or power drops to 0W to the motor very shortly after assist starts (within a second or two). I can usually see motor power go very high (1000W+) on the CA3 readout and then drop to 0W.
My PAS and Torque multiplier is set at 1 and 2.5 respectively. I have a 5W mode for steep hills. Even at 2.5W per human Watt, I can regularly get it to stop powering the motor from a standstill while pedaling hard. I'm not sure where to begin debugging the settings to solve the issue.
Each preset in the CA3 head unit is set to 90A and 2000W as per the default that shipped from Grin.
Now I get that at a stoplight, up a hill, I might be able to briefly demand more power than the system could provide, but I always assumed that the motor would just run up to its limit and not simply cut out. It feels like there's another setting there somewhere that's causing the drop-outs. The strange thing is that I can't always bring it back, sometimes I have to power cycle the bike while riding.
In "normal" riding where I start in a totally appropriate, not-grinding, gear on a relatively flat road I don't have this issue. However, it's often very different at a signalled intersection where I might have even taken the lane to make a left turn and thus put my own power down hard to get moving.
Even if I'm "doing it wrong"—I wonder if there's a setting that will let the motor get up to its limit and stay there while I accelerate instead of cutting out.
Just to cover my bases, the same thing seems to happen if I attach and use the throttle. If I demand too much power from the motor via the throttle, the motor just cuts out (CA3 display goes to 0W).
Edit: Some grammar.
I recently completed a Grin build with a Phaserunner V6, GMAC 8T and a 23Ah 52v battery (~50A continuous BMS circuit), in also has a torque sensing bottom bracket.
I'm having an issue where, from a stop, in certain conditions, there is either no power to the motor after starting from a standstill, or power drops to 0W to the motor very shortly after assist starts (within a second or two). I can usually see motor power go very high (1000W+) on the CA3 readout and then drop to 0W.
My PAS and Torque multiplier is set at 1 and 2.5 respectively. I have a 5W mode for steep hills. Even at 2.5W per human Watt, I can regularly get it to stop powering the motor from a standstill while pedaling hard. I'm not sure where to begin debugging the settings to solve the issue.
Each preset in the CA3 head unit is set to 90A and 2000W as per the default that shipped from Grin.
Now I get that at a stoplight, up a hill, I might be able to briefly demand more power than the system could provide, but I always assumed that the motor would just run up to its limit and not simply cut out. It feels like there's another setting there somewhere that's causing the drop-outs. The strange thing is that I can't always bring it back, sometimes I have to power cycle the bike while riding.
In "normal" riding where I start in a totally appropriate, not-grinding, gear on a relatively flat road I don't have this issue. However, it's often very different at a signalled intersection where I might have even taken the lane to make a left turn and thus put my own power down hard to get moving.
Even if I'm "doing it wrong"—I wonder if there's a setting that will let the motor get up to its limit and stay there while I accelerate instead of cutting out.
Just to cover my bases, the same thing seems to happen if I attach and use the throttle. If I demand too much power from the motor via the throttle, the motor just cuts out (CA3 display goes to 0W).
Edit: Some grammar.
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