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You can make the Kp and Ki values smaller if you increase the DC voltage. They should be below around 20,000, so I would increase the DC voltage to maybe 48 or 60v. Also, the LEM Hass 200-s has a resolution of -400 to 400 amp, but that wire would probably only carry maybe a few amps, so you won't get good resolution. You can wrap the wire several times through the current sensor window to increase the sensitivity. Another loop through makes it behave like a 100amp current sensor, with a range of -200 to 200. 4 passes through the current sensor windows make the range -100 to 100. etc... I would do that before attempting any PI testing.
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