I have the multiplus II 10000kva inverter and for the first time today i needed to mix some concrete, so i powered up my cement mixer and loaded it up. While it was running at full load the power was around 1500w including other loads in the house, but when it can to tipping the mixer into the wheel barrow i could see a desperate struggle to keep that motor running, it started slowing down considerably, but i managed to get the job done.
Afterwards i checked the consumption data and it only peaked at 2560w at that point of tripping the mixer into the barrow, yet it struggled. Is this normal for an induction motor, could i blow up my inverter if im not careful?
There is no way you can blow up the inverter. It could switch off and then remain on fault.
The problem is your single-phase motor with a capacitor to generate a rotating field via a second winding so that the motor can also start up and rotate.
This capacitor … and all the others too, of course … are an enormous problem for all multis or Phoenix inverters in addition to the motor. It is almost impossible for the toroidal core to generate this phase shift. So the power is sufficient in any case … the phase shift for the rotation of the motor is the problem …
Do you have the current FW on the Multi?
What do you mean by “current FW”
So is there a solution or can i carry on mixing concrete but maybe at smaller loads, so when tipping it out it causes less strain?
When the mixing container is tipped out, the position of the axis of rotation changes and therefore the load on the bearing … If necessary, grease the bearings and check the tension of the chain, if present.
As I said, nothing can happen except that the motor’s performance decreases because the rotating field cannot be maintained.
The current firmware ? in my opinion, there have been a few improvements for inductive and / or capacitive loads… There’s no harm in trying it out.
But if you don’t have the opportunity to do so … don’t worry … just continue with the old one .
Yes, light mixer loads are the best thing to do.
BTW, the capacitor that provides the phase shift for the second motor winding will give poor power factor at light motor loads. However, the Multiplus can and does provide this phase shifted current.
I recently updated the firmware when i switched to gui v2, the MultiPlus-II says v510 as current fw, and the cerbo is v3.54
Is that up to date?
No, for the mp 556 is the current version, with some modifications concerning inductive loads.