Old Inverter function codes

Hello Once again i need to tap the knowledge base please. I have an elderly (1995)Jaguar cub CM40 inverter driving a converted star to delta Higgs half horse motor, wheras it seems to run fine I understand that you should set parameters to match the motor.First of all is it correct to multiply the old FLA at 440V By root three to arrive at the new Full load amps at the new 230 V? and finally has anyone got a list of function codes for the CM40, the codes and procedures for the current version, 3-A do not seem to apply and IMO have no available information, a google search only threw up a very basic description of the inverters features.Any information would be gratefully received. Thanks for any replies

Paul

Edited By John Stevenson on 15/08/2016 15:14:56

Edited By John Stevenson on 15/08/2016 15:15:49

Hello John, Thank you very much for your swift and helpful response, this is a blue inverter and the 1995 came from imo when I rang them this morning, the fellow in technical said my inverter was no longer current! I have had a look at the link you provided, is this manual applicable to the blue CM40 that I have? and are you able to suggest a multiple for the full load current, if indeed this necessary. Thanks again, I am much obliged to you.

Paul

Edited By Paul Barter on 15/08/2016 15:59:05

Thanks for that confirmation John.Do you have a link for the blue cm40 manual please, if the c40 manual is not applicable?

thanks Paul

Edited By Paul Barter on 15/08/2016 16:21:41

Thee current rating for 440v star and 240v delta should be on the motor plate.

Sometimes they string it all in one line. It mights give 2 voltages with a star sign by one and a delta by the other. Next thing on the line will be the currents in the same order. Or they may put each on separate lines which is easier to read. Sometimes there is a range of voltages in each mode so they will show a current range as well.

A Brook unit for instance shows 220-240 delta, 360-420 star, Currents 1.29 - 1.16 for delta and 0.75 - 0.66 for star. That's for a 1/3 HP motor.

It wont be a simple factor because 3 phase AC waveforms overlap. They are phase shifted to each other.

John

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Thanks John This motor was originally only rated at 400/440V FLA 1.02A.it is old! However to allow running from the inverter above I have dug out the star point and connected it in delta.So it is a bit of an approximation to in put a value for full load amps to the inverter, if inddeed this inverter needs such an input.

I have been curious about digging out the wires at times. Did you differentiate the start finish of each winding ?

I've seen "demo's" where some one just identifies the coils with an ohm meter and then just connects them up as desired. I would have thought that the winding sense would have to be found as well but am not too sure. Or if that is the case which way they should be connected.

John

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Edited By Ajohnw on 16/08/2016 18:17:28

It doesn't matter which way round you connect the phases, as long as you connect them phase-to-phase ie each winding between a pair of phase connections (g L1 and L2 etc) - and no two windings in parallel with each other! If you get the machine rotating in the wrong direction, you can simply swap any 2 of the phase (live) wires around or any one of the windings.

Thanks Muzzer. I wondered because not being concerned about the winding sense seems "un magnetics" to me.

John

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Muzzer, I thought it didn't matter, but it does! This is because the windings are mutually coupled, so you have to get them in the right sense other wise the motor won't run properly. Once the windings are connected in the right sense, you can swap round the connections to the 3 phases to reverse the motor. This is mentioned on a thread on here somewhere.

It seemed to me that should be so John. How did you do it ?

I have seen one idea in a foreign language video. I think he use a bell battery directly to kick some current into a winding and looked for a kick in the volts on another winding - but then comes polarity and which way they should be connected. I'd gues + to - in this sense but not sure.

John

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Edited By Ajohnw on 16/08/2016 19:22:48

Edited By Ajohnw on 16/08/2016 19:26:46

The start and finish of the winding must be correct but the phase order does not matter as it will just run the wrong way so just swap them to get the desired rotation. If you get a winding the wrong way round the motor will not sound at all happy.

Mike

See this thread

**LINK**

I looked around on identifying wires on 3 phase motors and all seem to indicate sense doesn't matter. Odd I thought so just looking around on motor details I think this shows why it does

I suppose if they are just connected willy nilly 2 must be the same so only one can be wrong.

Now I will have to look at the link again and see if delta is wired as I thought +ve to -ve as far as the excitation and kick in the volts is concerned. I could only find a video from India that indicated this way of doing it. No English other than a few tech terms and zilch on the web.

John

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As some might want a copy of the details handy I have stuck a jpg in my woffle album

John

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