Hi,
I have an ASI BAC800 that was programmed by ERT. It was waaaaay too aggressive - it would make this "ga-ga-ga" sound while starting and act like it wanted to rip the chain with every engagement. It sounded like an angry midget with a sledgehammer was bashing something rather than a motor turning a chainring on startup.
I noticed the kp/ki was set to 1.6/356. It worked for a full year at these settings. I turned it down to 0.79/5 and it was way better. Not as fast feeling, but it felt like a motor, not a bomb that was about to explode anytime I touched the throttle. It was usable, and worked well.
I tried pushing it a little, to 0.89 kp and 10 kI, and it immediately stopped working after two or three tests of the throttle. B+ and B- on power input plug is now 1 ohm to ground. RIP.
On a similar BAC855 controller, the same thing. I tried kP of 0.89 and KI of 20 on that one. It worked, a little more aggressively. I thought I'd try a ride the next day with it. I turn it on the day after and there's 5 faults on it.
Clearly it is easy to murder ASI controllers/phaserunners(I have murdered a BAC855 and a phaserunner so far messing with this) if the KP/KI is not set properly. I do not think KP being too high is a problem - or else it would've died at 1.6. Nor is KI being too high, since KI being at 356 didn't kill it. For some reason 0.89/10 and 0.89/20 as kp/ki killed two in one day.
Is it pure coincidence, or are there certain ratios of kp/ki that will murder controllers even if they are being pushed very mildly with no load inside?
Thank you.
I have an ASI BAC800 that was programmed by ERT. It was waaaaay too aggressive - it would make this "ga-ga-ga" sound while starting and act like it wanted to rip the chain with every engagement. It sounded like an angry midget with a sledgehammer was bashing something rather than a motor turning a chainring on startup.
I noticed the kp/ki was set to 1.6/356. It worked for a full year at these settings. I turned it down to 0.79/5 and it was way better. Not as fast feeling, but it felt like a motor, not a bomb that was about to explode anytime I touched the throttle. It was usable, and worked well.
I tried pushing it a little, to 0.89 kp and 10 kI, and it immediately stopped working after two or three tests of the throttle. B+ and B- on power input plug is now 1 ohm to ground. RIP.
On a similar BAC855 controller, the same thing. I tried kP of 0.89 and KI of 20 on that one. It worked, a little more aggressively. I thought I'd try a ride the next day with it. I turn it on the day after and there's 5 faults on it.
Clearly it is easy to murder ASI controllers/phaserunners(I have murdered a BAC855 and a phaserunner so far messing with this) if the KP/KI is not set properly. I do not think KP being too high is a problem - or else it would've died at 1.6. Nor is KI being too high, since KI being at 356 didn't kill it. For some reason 0.89/10 and 0.89/20 as kp/ki killed two in one day.
Is it pure coincidence, or are there certain ratios of kp/ki that will murder controllers even if they are being pushed very mildly with no load inside?
Thank you.
