for illustration supposes only

looking at the pic, the rpm i think is about right for an induction motor. but you need to see the terminal layout and see if its wired in star/delta. you really need someone with experience to see what motor it is, or at least track down a manual/specs on it. i cannot remember about running VFD's with single phase motors (with caps), as we typically remove the caps and wire them to three phase VFD as that also provides the overload protection etc. you can get cheap vfd's now, sub $500. tho its a steep learning curve to confiq the vfd's, you want to get the overload setup correct.

gregmcc:

 

If I give out electrical advice on how do do xyz to a non electrical person and as a result of them not able to understand/comprehend what they are doing and something happens, lets say it burns up and the house catches fire, Worksafe/EWRB come after me, I lose my practicing license and can no longer work.

 

Please provide any instance of this actually happening when having a general discussion about how to use a product.

gregmcc:

 

A soft starter is not designed to use less power to start the motor, it is designed to ramp the speed up slowly over a set time, 

 

A soft starter is in fact designed to reduce inrush current. It's widely used for this purpose as well as to reduce wear and tear on the motor set.

It doesn't look like OP is trying to use less power to start the motor but to reduce the peak load. 

Handle9:

 

gregmcc:

 

If I give out electrical advice on how do do xyz to a non electrical person and as a result of them not able to understand/comprehend what they are doing and something happens, lets say it burns up and the house catches fire, Worksafe/EWRB come after me, I lose my practicing license and can no longer work.

 

 

Please provide any instance of this actually happening when having a general discussion about how to use a product.

 

A proposed wiring diagram is not a how to use discussion, it was a "will this work" clearly seeking electrical advice.....

Handle9:

 

gregmcc:

 

A soft starter is not designed to use less power to start the motor, it is designed to ramp the speed up slowly over a set time, 

 

 

A soft starter is in fact designed to reduce inrush current. It's widely used for this purpose as well as to reduce wear and tear on the motor set.

 

It doesn't look like OP is trying to use less power to start the motor but to reduce the peak load. 

 

Yes to the motor by wave form modification, on the input side of the soft starter the current can easily be higher, how do I know, I've done measurements on soft starters while ramping up and down.

gregmcc:

 

Handle9:

 

Please provide any instance of this actually happening when having a general discussion about how to use a product.

 

 

A proposed wiring diagram is not a how to use discussion, it was a "will this work" clearly seeking electrical advice.....

 

Ok, how about any prosecutions for this at all?

gregmcc:

 

Handle9:

 

A soft starter is in fact designed to reduce inrush current. It's widely used for this purpose as well as to reduce wear and tear on the motor set.

 

It doesn't look like OP is trying to use less power to start the motor but to reduce the peak load. 

 

 

Yes to the motor by wave form modification, on the input side of the soft starter the current can easily be higher, how do I know, I've done measurements on soft starters while ramping up and down.

 

It can do if the wrong device is chosen.

It'd be a much more useful discussion to actually help with selection and applications rather than be deliberately obtuse.

With the 'quality' of 'design' coming from actual 'engineers', I don't think you need to worry too much about prosecution. Especially with design being expressly not PEW. 

Watch out if you annoy the EWRB for other reasons, though. 

Electronic soft starts are normally a triac/SCR device. Kirchoff's law says supply current equals load current; there is no alternate path unlike a transformer or shifting between series/parallel or star/delta connections. 

SomeoneSomewhere:

 

With the 'quality' of 'design' coming from actual 'engineers', I don't think you need to worry too much about prosecution. Especially with design being expressly not PEW. 

 

Watch out if you annoy the EWRB for other reasons, though. 

 

Yup. It'd FUD used by electricians.

The funniest thing is the same electrician will go to the wholesaler and blindly follow wiring advice from someone who has no qualifications at all.

Am electrician. Following wiring advice from the wholesaler is not a good idea. Many wholesalers have explicit signs stating that. 

SomeoneSomewhere:

 

Am electrician. Following wiring advice from the wholesaler is not a good idea. Many wholesalers have explicit signs stating that. 

 

Yet it happens every day.

rd400f:

 

startup current draw  ...correct

 

SSR-40WA-R2(1.5KW)

 

Aluminum Profile Radiator For Voltage Regulating Soft Start Module 110*100*80mm

Ironically it looks like your wiring diagram is correct, at least according to the data sheet of that device. 

Saying that it appears to be a Chinesium piece of junk I wouldn’t have anywhere near my house. Were you looking to source it from AliExpress or is it a locally supplied device?

If there is no SDOC it’s non compliant and a likely fire hazard no matter how you install it. 

Having looked at this particular question in the past

 

1. There are commercial products that have variable speed built in.  I think they ramp up.  Search for " Trevoli CMB-72vp Variable Speed  Pump" 
2. and looking for something for work I have seen the following - You can get somewhat better looking VFD's for single phase motors. (I'm not an electrical engineer.  I know just enough to know who to ask).  Search for "BIA-IDRIVE 1220-240"  Has full documents on the Whiteint. website.  

I'll be interested to see what the qualified opinions are on the latter.

cheers.