LDU bench testing - udc shows high voltage with none applied

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dhiltgen
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LDU bench testing - udc shows high voltage with none applied

Post by dhiltgen »

I'm trying to do an initial bench test but could use some guidance.

I intend to use a subset of my pack to keep the voltage down (70v) and want to use the LDU to drive the precharge and main contactors for the test. I updated the udcsw and udcmin. Before hooking up the HV to the contactors I noticed the LDU activates both contactors almost immediately after I give it 12v. I think the reason is udc is showing 209.31v which is above my target 60v even though there's actually zero volts HV going into the LDU at this point.

Any suggestions on what may be leading to the incorrect udc reading, or is this somehow expected? Perhaps my soldering on one of the connectors is bad?

LDU: 1025276-00
Board: V4B
FW: 4.89.R-sine

Thanks!
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johu
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Re: LDU bench testing - udc shows high voltage with none applied

Post by johu »

I would suspect the soldering. 209V is about the value the ADC settles at when nothing is connected to the pin
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