The dreaded cement mixer

DIY
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1

Last year i used my cement mixer to mix heavy concrete and it was somewhat over loaded, this for particularly noticed when tipping the drum horizontal to empty into a wheel burrow. I have a MultiPlus-II 10kva system and the cement mixer is 230v single phase induction motor.

Last year I nearly stalled the drum, it really struggled when horizontal. I mentioned this in this forum and I was advised to upgrade the multiplus firmware which I did do after the cement job. Although I couldn’t for the life of me figure out how firmware could improve the MultiPlus-II with induction motors.

Fast forward to this weekend, ive been putting off a concrete floor job, and thought I have to get it done, dreading the cement mixer problems, but I decided to push ahead and mix the concrete, I over loaded it again (I cant help myself than to make big mixes) and I was expecting the stalling problems when tipping the drum into the burrow, but this time it worked flawlessly, as if it was running from grid power (im off grid) and I got the job done with zero issues.

Here’s my question, what has this firmware update done to the way the MultiPlus-II can now drive an induction motor? I always thought a 50hz sinewave is a 50hz sinewave, how can an update change this?

2

Not easy to say, you would need to know both firmware version numbers from before and now in order to be able to compare what has changed. But its also possible that the reset to factory settings has helped. This is done by the firmware update, and if you did not load your previous settings again, then that would be more likely to change the behaviour.