openinverter forum

Problem: My motor won't turn, even though the PWM signal is present. What am I missing?

This is my first time using Open Inverter.
I Inherited a have a Prius Gen 3 inverter with Damien's V1C board (denoted “Block III”). I was told it was working, but I couldn't get it to spin a motor, so I decided to order another board using the newer “Block 4” schematics. I ordered from JLC PCB.
I am trying to run an AC induction motor with an encoder. I'm using the latest (v5.35.R) Sine firmware.

As far as I can tell, the board is running well and producing a PWM signal for the gate drivers.
I have 3 incandescent light bulbs wired in a Delta configuration to the 3 phases of MG2.
When I set fslipspnt = 1 Hz, and Ampnom= 50%, manualstart= on, none of the light bulbs illuminate. I have tried various amounts of current, and PWM frequencies. Pin 3, MG2_FORW_IN is connected to +12V.
I have the system set up with a 48-volt battery. I have tried other voltages, lower and higher up to 150 volts.

In the dashboard, OPMODE is set to "run". Everything looks good, but I'm getting little/no current out of MG2.



Here is a photo of my test setup:



There is a PWM signal present on the MG2 phases, but I'm just seeing the frequency of the mains voltage (60 Hz in my case):



Is there a problem with my Gen 3 Inverter? I have a second one, and installing the board on that one gives the same result.
Here is a close-up photo:



Is there a problem with my parameters? or the hardware version? hwrevs is displayed as Rev2. How can I change it?
I have also connected and setup the throttle, but pressing it doesn't do anything apart from changing opmode to "pot pressed"
I can set up the encoder, but I don't think it's needed yet at this stage, correct?
I will post my parameters below.

My Parameters

{
"boost": 1700,
"fweak": 90,
"fweakstrt": 400,
"fconst": 180,
"udcnom": 0,
"fslipmin": 1,
"fslipmax": 3,
"fslipconstmax": 5,
"polepairs": 4,
"respolepairs": 4,
"sincosofs": 2048,
"encmode": 1,
"fmax": 200,
"numimp": 60,
"dirchrpm": 100,
"dirmode": 1,
"snsm": 12,
"pwmfrq": 2,
"pwmpol": 0,
"deadtime": 130,
"ocurlim": 100,
"il1gain": 4.56,
"il2gain": 4.5,
"udcgain": 5,
"udcofs": 0,
"udclim": 540,
"snshs": 1,
"potmin": 0,
"potmax": 3500,
"pot2min": 4095,
"pot2max": 4095,
"potmode": 0,
"throtramp": 100,
"throtramprpm": 20000,
"ampmin": 10,
"slipstart": 50,
"sinecurve": 0,
"throtfilter": 4,
"brakeregen": 0,
"regenramp": 100,
"regentravel": 0,
"offthrotregen": 0,
"cruiseregen": 0,
"regenrampstr": 0,
"brklightout": -50,
"bmslimhigh": 50,
"bmslimlow": -1,
"udcmin": 450,
"udcmax": 520,
"idcmax": 5000,
"idcmin": -5000,
"idckp": 2,
"idcflt": 9,
"tmphsmax": 85,
"tmpmmax": 300,
"throtmax": 100,
"throtmin": -100,
"accelmax": 1000,
"accelflt": 3,
"iacmax": 5000,
"ifltrise": 10,
"ifltfall": 3,
"chargemode": 0,
"chargecur": 0,
"chargekp": 80,
"chargeki": 10,
"chargeflt": 8,
"chargepwmin": 0,
"chargepwmax": 90,
"idlespeed": -100,
"idlethrotlim": 50,
"idlemode": 3,
"holdkp": -0.25,
"speedkp": 0.25,
"speedflt": 5,
"cruisemode": 0,
"cruisethrotlim": 50,
"udcsw": 0,
"udcswbuck": 540,
"tripmode": 0,
"bootprec": 0,
"pwmfunc": 0,
"pwmgain": 100,
"pwmofs": 0,
"canspeed": 2,
"canperiod": 0,
"nodeid": 1,
"controlid": 63,
"controlcheck": 1,
"manualstart": 0,
"fslipspnt": 1,
"ampnom": 10
}

I'm the absence of any other suggestions, try putting the capacitor on and connecting you voltage as shown in the wiki

Can you include a complete list of your spot values. And please upload the pictures and files to the forum. (see Attachments in the full editor)

With manual start on and fslipspnt and ampnom set. Do you see the angle change in the spot values or in a plot?

Devon8000 wrote: ↑Sun Nov 09, 2025 11:48 pm There is a PWM signal present on the MG2 phases, but I'm just seeing the frequency of the mains voltage (60 Hz in my case):

Do you have your probe grounds connected to the "HV" negative? if they are floating they will pick up 60hz.