Excitation output problem

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marucha79
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Excitation output problem

Post by marucha79 »

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?
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johu
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Re: Excitation output problem

Post by johu »

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
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marucha79
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Re: Excitation output problem

Post by marucha79 »

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?
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Re: Excitation output problem

Post by johu »

You can ignore the status as long as it stays in run mode. Do you get the 4.4khz square wave on R40?
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marucha79
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Re: Excitation output problem

Post by marucha79 »

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?
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Re: Excitation output problem

Post by johu »

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
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marucha79
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Re: Excitation output problem

Post by marucha79 »

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?
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Re: Excitation output problem

Post by johu »

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