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

[raynerd]

b32 - Reactive current setting

Setting Range: 0,1...1,0 x IN
Default Setting: 0,58 x IN

The parameter adjusts the reactive current (no-load current) of the motor in ampere. The right setting (especially at small motors, multi-motor operation, at motors with nominal power smaller than the inverter or at motors in 400V / 87Hz operation) improves the current display, the motor protection and the overload limitation. At small motors a wrong setting leads to an early trip caused by the internal motor protection function.

In all honesty, I can read the words but it doesn`t really mean anything to me! So I presume this would be set to.... high? The problem I`m finding with most of these settings is knowing what to set the values to!

Chris!

[David Jupp]

It says that for small motors it will get confused if this isn't set correctly, motor protection may kick in and reduce speed.

0.58 IN  translates as 0.58 x nominal current (should be on motor rating plate).  NB I haven't gone back to check the full list of definitions in the manual - that might be a good idea in case they have some very specific meaning for IN.

[raynerd]

Well I can see "1.82/1.05A"   and  "1.89-1.87/1.09-1.08A"  written on my motor plate.  I thought b2 setting allowed a value 0 - 1 but it doesn`t, it allows a range from 0 - 2.6. Also, it says 0.58 is default yet after a factory reset, 1.5 is the value of b32. Anyway, fairly irrelevent as I have tried lots of numbers within the range and I can exactly the same results! Squeeling motor with no speed control and freq of 16Hz.

I`ve also swith the base frequency to 60Hz and could "hear" a change in the motor, but it was pretty much the same just a slightly different pich of squeeling.

My hope is fading!!

Chris

[Swarfing]

Chris i'm wondering whether this may be a duel voltage motor where it would be 240v 'Y' and 120v delta? can you put up the make /model etc of the motor so we can do some surfing on it?

[raynerd]

Hi Swarfing,

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

[John Rudd]

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

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

[raynerd]

I`ve not had time to try it yet, but I just wanted to mention that I`ve found that my pDrive is just a rebranded Hitachi X200 and the manual for the X200 is much much more detailed than that of my pDrive:

http://www.ostergrens.se/upload/Hitachi/X200-Instruction_manual_NT301X.pdf


I can`t bloody believe it. The only parameter that I wanted an explanation to, b32 nominal current setting, isn`t shown?!?!

[David Jupp]

Looks like nominal curent is around 1.8 or 1.9 A - when wired in Delta (which is what I'd expect).

[raynerd]

Finally bloody found it!!!

Someone pointed out that A045 is voltage gain setting and is allows the output voltage to be set within the range of 50...100 % of the input voltage. so if I`m running a 220v winding on the 380v vfd I set it to 220/380 = 57% and it worked!

I shouldn`t fret and just be happy, but I`m now curious Why  the Jaguar inverter worked?

Chris

[Swarfing]

Chris it should be 220 in and 220 out so you should be able to set that to 100%

[raynerd]

Swarfing, I`m pretty sure i`ve set most parameters now and it is the only one that allows the motor to run without error message!

Without it set and showing the current on display, the current goes above 2.5A and just trips the system. With this set, it seems to maintain a constant max current.

I`m really no expert...its just the only parameter that seems to let it work!!

Chris

[Swarfing]

Sounds like you cracked it then  , well done

[raynerd]

Disaster...motor runs but with no torque!!

back to the drawing board   

[raynerd]

Hurray, finally working!! In truth, I took it to a motor repair place and they tested it, said the motor was fine but although my wiring looked right, I`d got the poles the wrong way around and rewired it. Which is confusing, because it looked identical to how I`d done it!!  I`d driven a fair distance and for £10 more (£25 total) he offered me a cap for cap start incase my inverter was duff. Anyway, got it home, reset the inverter, put in the basic parameters and off it went...

Finally fixed!!!

Chris

[Swarfing]

Great news Chris and the cost was pretty good really to find out and stop banging your head.

[raynerd]

£15 would have been great but I took the cap as I was convinced it wasn`t going to work with the inverter and with the capacitor he showed it me working!  Still, £25 was a bargain, especially against my next steps of buying a different inverter or messing around fitting a new motor!!