July 30, 20233 yr The Axpert 5KV-48- PAR-A I'm busy with ATM is producing up to 430v on the DC bus , this is too high surely(normally around 380-395v), can this be a problem in the feed back voltage sense circuit in SMPS, any thoughts please
August 1, 20233 yr On 2023/07/31 at 2:40 AM, AndrewF said: can this be a problem in the feed back voltage sense circuit in SMPS No, but it could be a bad (reading low) measurement of the DC bus voltage. Or the bus soft start power supply not turning off. What bus voltage does a QPIGS command return? Edit: Actually, thinking about this, unless you have solar connected and it's a high PV voltage model, in battery mode the DC bus should always be 8x or 7x (depending on the model) the battery voltage. Unless that bus soft start power supply is still running. Edited August 1, 20233 yr by Coulomb
August 10, 20233 yr Author Hi Coulomb, i was wondering, on the AC conversion side there are optos AT350 which are high voltage rated, can lower rated Optos be used as it seems the the optos are only switching -5v and 15v to the gates of IGBTs..
August 10, 20233 yr 14 hours ago, AndrewF said: can lower rated Optos be used as it seems the the optos are only switching -5v and 15v to the gates of IGBTs.. No. Though they only switch -5 and +15 V, they isolate hundreds of volts. These are also gate drivers, not just a photodiode and phototransistor.
September 13, 20232 yr Author Hi this screenshot is part of sharing post on starting up PWM ic without battery side FETS present, can the same be done for the tracing/testing of sine wave pulses for IGBTs on the bus voltage(450v) . The IGBTs are removed But the battery side FETs are present. the battery side pulses are fine BTW.. https://forums.aeva.asn.au/viewtopic.php?p=65282#p65282
September 13, 20232 yr Hi this screenshot is part of sharing post on starting up PWM ic without battery side FETS present, can the same be done for the tracing/testing of sine wave pulses for IGBTs on the bus voltage(450v) . The IGBTs are removed But the battery side FETs are present. the battery side pulses are fine BTW.. https://forums.aeva.asn.au/viewtopic.php?p=65282#p65282 Hi @AndrewF also see this post :
September 15, 20232 yr From the AEVA repair and hardware modifications thread (via the index): Control board pinout (non VM models)
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