openinverter forum

Hello. I was trying test sin/cos output voltage to make properly resistor devider for MB v.3, but get stuck because there is no any voltage on pin 4 (excitation). I switched firmware to 4.97, as in instruction for FOC tuning, but "opmode" is still "Off" and "staus" says "UdcBelowUdcSw|EmcyStop". I connected pin 23 (GND) and 12V to pins 24, 7, 11. "Udcmin" is set 0V, "encmode" is "resolver" . It's quite strange, because on Johu film I see only power connection and excitation works. Any sugestion?

something is throwing you out of run mode. Probably the overcurrent comparator. Try applying the same voltage, like 1-2V to the two current sensor inputs

Thanks, it helped enter ManualRun, but there is still status "EmcyStop" and no live on pin 4. Should I connect pin 17 to 12V too?

You can ignore the status as long as it stays in run mode. Do you get the 4.4khz square wave on R40?

Ok, it works. I expected some voltage on pin 4 and on sin/cos, but I can"t measure any. However there was wave 4,4kHz on R40 and about 5kHz on pin 4. I connected sin/cos wires and get some feedback. Does it mean, that sin/cos voltage can be measured only by oscilloscope?

Not sure what exactly you expect. Pin 4 is an OUTPUT, you should see 4.4 kHz, 9V peak to peak voltage sine wave there in run modes. sin and cos are INPUTS they take the resolver return signals

I haven't got oscilloscope yet, I'll get it tomorrow, so I measured using simply multimeter. Between pin 4 and GND there is 5,4 kHz frequency and 3,3 V on AC range. It seems I was doing something wrong while previous tests, mayby I measured voltage on DC range. Will it be ok if excitation of my resolver MCR605 according to datasheet works on 7Vrms and 10kHz?

yes so far 4.4kHz 3.3V RMS has worked for all resolvers out there (Leaf, Prius, Outlander...)