11-24-2021, 01:27 PM | #11 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: L4 / L6 with Navitas AC / 600A?
Quote:
Question - What FW profile (RXV or L6 or generic etc...) and version are you running on your Tac2? What are your "off road" settings (accel ramp rate and max accel)? Issues I mention aren't related to voltage sag - ruled that out long ago. Your 20" tires and 16:1 gears are I think possibly why you don't notice this issue. I've got stock 12.5:1 gears and 22.5 (actual, say 23 on sidewall) tires so I've got a harder load for the motor to move. Cart weights are in the same ballpark. I can eliminate the harsh jerking just by lowering accel ramp rate parameter, but it also aggravates the hesitation that sometimes comes with re-acceleration. It's interesting that the stock setting for Accel Ramp Rate (usually 200) is so far out and causes these issues, but only in a 72v configuration. I had no such issues at 48/52v, with stock parameter at 200. I need to use ~100 or so max to avoid the jerking upon hard re-acceleration from those slow speeds. Thanks again for the info. |
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11-28-2021, 05:56 AM | #12 |
Getting Wild
Join Date: Apr 2009
Location: Winchester, VA
Posts: 85
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Re: L4 / L6 with Navitas AC / 600A?
Not sure what FW profile means but I am set up the same as an L6. But I did take a look and I'm actually 17:1 on the rear end gear config, 200 on ramp rate and 4096 max acceleration. I can check the version once I get back out into the shop and connect to the controller. Here are screenshots of my config.
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11-29-2021, 05:50 PM | #13 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: L4 / L6 with Navitas AC / 600A?
Quote:
I think the high gear ratio may mask or eliminate what I'm noticing - a guess anyway. 17:1 along with smaller tires makes things much easier on your cart than mine, in any kind of acceleration situation. |
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