pDrive CX Single - will this inverter run my 3 phase motor?

Gallery, Projects and General > How do I??

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John Rudd:

--- Quote from: craynerd on January 07, 2012, 08:21:41 AM ---

Motor is: Siemens 3~ Mot 1LA7073-4AB10

All info on the plate:

Siemens 3~ Mot 1LA7073-4AB10
UD 0805/71041082

Side 1
IP55 71M IM B3
50 HZ 230/400V (!triangle shape!)/Y
0.37kW 1.82/1.05A
cos (phi) 0.78 1270/min
220-240/380-420V (!triangle shape!)/Y
1.89 -1.87 / 1.09-1.08 A
32142 6001

side 2
IEC/EN 60034 ThCL155(F)
60Hz 460V Y
0.43kW 1.02A
cos (phi) 0.76 1670/min
440-480 V Y
1.08-1.09 A

I hope that all makes sense!!

Chris

--- End quote ---

Delta is the connection format for the triangle shape, and states the motor is dual voltage when connected in either config so should be suitable but you proved this using your other vfd...

This has to be a setup option on the new vfd that is causing the issues.......

philf:
John,

I had a Eurotherm 0.55kw inverter which I wanted to use on my bandsaw. The motor was a Hoover 3-ph which was Delta connected. However many parameters I tried to change, I got similar results to Chris. (Squealing, low speed, no torque.)

I tried a Mitsubishi 0.4kw inverter and the Hoover motor ran perfectly from the default settings.

The Eurotherm, from its default settings, had no problems running a 0.55kw Baldor, inverter rated, motor which I bought new for my CNC project.

I'm sure I have read about why some motors won't work with some inverters but a very quick look on Google didn't turn anything up.

Phil.

raynerd:
Made some progress in a strange way last night.

Parameter: Selection of overload restriction. Currently set to during acceleration and constant speed, perhaps stupid, but I set this to "OFF" - 00.

The inverter then behaves as it should, the pot becomes active and the inverter accelerates as it should for about 4 seconds....and then trips to Error 3 !!

So it proves that this overload restriction is clearly kicking in and causing the inverter to not change freq above 16Hz and make the motor squeel.

The question is now why is the overload restriction having to kick in. Looking at Error 3:

Set acceleration time too short, short circuit at motor terminals, earth fault, set voltage boost too high, nominal motor current is higher than the nominal current of the inverter (David Jupp - this is the setting b32 you noticed but I have tried to change this with no luck, but no clue what it should be set to!!)

David Jupp:
So is b22 set appropriately for your motor?

Are you certain motor is wired correctly?

raynerd:
Hi David

Right, I think I see what you are saying. b21 is Overload Restriction Mode and b22 is the level of restriction. So is the level set correctly before restriction kicks in. My answer is that I haven`t a bloody clue what it should be set to BUT that being said.... if I`ve totally removed the restriction, i.e set b21 to off and it is still tripping. Actually thinking aloud...if I can set the restriction I should get more range before it cuts in!

I`ll give it a bash.

Chris

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