Please don't get me wrong, I don't know what power are you expecting out of your inverter but at powers around 50kW+ you'll probably have serious issues with those bus bars :(


Understood. Right now the goal is just a low power bench top test unit. I wanted something to play with as a proof of ...

Update: I have finally received all my replacement parts from China and re-assembled my power stage. I'm happy to report so far it seems to be operating as expected. At this point I'm fairly sure the failure was the IGBT module. I figured it would be cheaper and easier to just try a new IGBT module ...

Thanks for the help everyone. I'm going to mark this thread resolved and after I make the suggested changes I'll open a new thread if needed.

Thanks for the feedback. I will make modifications to the power stage to reduce inductance. I tried to mount the capacitors as close to the IGBT terminals as I physically could. I was hoping this vertical arrangement and the thick copper bars would achieve that. The vertical section of the bus bar ...

Capacitors are Electronicon PK 16 Electrolytic Capacitor, 420uF, 1100VDC
Also a Metallized Polypropylene Snubber Cap 2.5uF 850V 10%
IGBT is POWEREX - CM50TF-24H - IGBT MODULE, 50A 1200V SIX PACK

These components were all purchased used on ebay.

https://i.lensdump.com/i/WOwQvk.md.jpg
https://i ...

Unfortunately I've had quite a bit of bad luck the last few days. When I took the measurement from my previous post I wasn't expecting that level of voltage on the driver outputs. I was using a 1x probe which fried my oscilloscope.

I borrowed a scope and I decided to troubleshoot with a lower DC ...

Ok, I think I found the problem. My second phase top output signal is different from the others with high voltage. The signals all look the same when I have 0v or low voltage on the DC bus, but when I have high voltage on the DC bus I see this only on one signal.

https://i.lensdump.com/i/WOmjmx.md ...

For testing my DC voltage source is rectified mains with an isolation transformer.

Here are some images with il1rms plotted on the right.

Today there was a rough start with lots of vibration:
https://i.lensdump.com/i/WOEGtC.md.png

Then for some period the motor was running fast and smooth ...

I'm using the gate drivers provided with the kit.

Here is a plot with il1rms. (The il1rms value is hard to read, it is 1A.) This plot captures 3 faults. The inverter seemed to recover from the first fault but shortly after it fails twice more. There is a bus voltage drop at each fault and what ...

Ok I think I'm making some progress but I think I have a fault somewhere. When I run manually with both A and B channels the motor takes off and spins up to around 2,600rpm for a shot period. Then it suddenly slows to around 150 rpm and starts to vibrate a bit while turning slowly.

https://i ...

Ok so after disassembly of my inverter it appears I have all components except J1 populated. With this hardware configuration I should be able to use both the A and B channels from my encoder correct?

https://i.lensdump.com/i/W7UIHZ.md.jpg

If I start the encoder manually via the web interface I ...

It's a rev 2. I populated the board from a kit. I did populate all components. I'll have to disassemble it and modify the components. So I must remove component J1?

Also, I'm not sure if this is related but when I do switch to AB mode and attach both the A and B channels from the encoder when I start the inverter in manual mode the motor spins up clear to 6000 rpm. It's actually kind of scary considering the max rated RPM for this motor is 3600.

Indeed, with the encoder disconnected the motor does spin at 300rpm.

My encoder actually supplies an A, B and Z channel but for troubleshooting I was running with encmode = single and only using the A channel of the encoder output. I would like to use A and B channels of the encoder output if ...

Yes I'm using 2, here is the export of the parameter values I'm using when I ran this test:


{
"boost": 1700,
"fweak": 64.71,
"fconst": 180,
"udcnom": 0,
"fslipmin": 1,
"fslipmax": 3,
"fslipconstmax": 5,
"polepairs": 2,
"respolepairs": 1,
"encmode": 0,
"fmin": 1,
"fmax": 200,
"numimp ...

Yeah I figured 2300 rpm is way too fast for 10Hz. I'm very confused why it spins so quickly.

Here is my motor nameplate:

Hello,

I've been wrestling with erratic speed plotting with my inverter. I'm at a loss how to troubleshoot this issue. I have an encoder which is providing 64 ppr. In this case, I've run the inverter in manual mode by starting it with the button on the web interface.

I'm running the inverter with ...

I'd like to request adding a bbcode for strikethrough text. I guess this feature has to be added explicitly by the admin.

Obviously the ppr provided by my encoder is too high. Its been a long time since I was in college and I only have a vague recollection of my digital logic course, BUT I do remember discussion of frequency division techniques. The trick now will be trying to remember exactly how they worked. I think ...

I have been powering the inverter with a bench top power supply. I'm still working to get all the parameters dialed in and I don't yet have a throttle pot connected. I suppose there could have been a momentary power loss.

The last troubleshooting I did was downloading the parameters as json, then ...

Thanks johu, arber333. I will remove the Z signal and try the resistor value modifications you have suggested.

Firmware version is 4.00, opmode is 2.

The time at which the motor stops running seems random. It has stopped in as little as 8 seconds, and sometimes it has run for longer than 10 minutes.

While the motor continues to run I've noticed that the values displayed by the web inteface match the ...

While testing my inverter in manual mode I've noticed the motor will stop running after some random amount of time has elapsed. When I investigate I find that 2 parameters have lost their values. The two parameters which are losing value are fslipspnt and ampnom.

While testing I set the values of ...

Yes I believe it provides 1024 pulses on each channel. This image is taken from the documentation.

https://i.lensdump.com/i/WEtv6M.png

I attempted to power the encoder with the 5v provided from the ENC_5v pin, but it seems the encoder draws too much current and the voltage sags to 2.1v and the ...

Unfortunately encmode AB doesn't seem to work very well for me either.

The motor is an ACIM motor and it is equipped with a dynapar incremental encoder. The encoder provides an ABZ signal. The model # is HA625102403EA. From what I can tell reading the datasheet at https://ecatalog.dynapar.com ...