Inverter in the power circuit of the Dahlander Y/YY motor - experiences and suggestions

Question

I have a question on the topic. I need to smooth out the start of a motor running Dahlander, Y/YYY, but at low speed. Is it possible to insert an inverter in the power path? Have any of you done something like this? I'm talking about a transition circuit before disassembling the whole thing and switching to automatic control and inverter.

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domel.an · Answer

Hello
Responding to the question theoretically, the answer is - yes, you can (in only one gear, of course).
But practically, it depends on what drives this sinik (what loads occur, their characteristics).
Detail the above and how you want to plug it into the existing system (preferably a diagram).
Then you can count on a concrete answer.
Greetings.

RafalST.PL · Answer

We have a 5.5 kW motor to drive the fan through a belt transmission. In low gear 1455 rpm. The idea is to make it move a little softer at this point.

domel.an · Answer

If only in one gear and only smooth run-up you need, then use soft-start.
Tell the full parameters of the sonic ( preferably the nameplate) because in the case of fans, with the increase in speed, the demand for motor power does not increase proportionally.

RafalST.PL · Answer

We have a Siemens motor 1LA71300-0BA60-Z Plate not visible, we write down from the photo from the mirror
Y/YY 1455/2920/min
3.2/12.5-3.0/13.5 A
5.9kW
We want to give an inverter because it will be the target anyway after the Dahlander is unplugged. The system never works at a higher speed

domel.an · Answer

Since it works only on one speed, you can use an inverter without the slightest problem. I suppose you have little experience with inverters, so I recommend a simple to configure and inexpensive https://sanyu.eu/produkt/falownik-sanyu-sx1000-5r5g-4/
Also provide full support by phone 🙂

Ps. For what reason do you want to replace the motor ? After using an inverter, I don't see the point of replacing it.

RafalST.PL · Answer

Thanks for the info. I have been using inverters in industry for a quarter of a century and the equipment is already there. I've never replaced a Dalhander because it's standard in ventilation and not in industry. We don't use Y/YY two-speed motors but standard ones. Inverters we have already selected.

Inverter in the power circuit of the Dahlander Y/YY motor - experiences and suggestions

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