December 29, 20196 yr Hi All, An Axpert MKS-3K-24 inverter (PF1) is tripping a 32A AC input circuit breaker but working fine in battery mode with no fault code on the LCD. I suspect a failed MOV between phase and neutral but this can only be established after opening the unit. The installation has common and differential mode surge protection provided by a 40kA Type-2 SPD and an under/over voltage protection relay. Other than MOVs, what else should I look for when opening the unit? Cheers!
December 30, 20196 yr 2 hours ago, Kilowatt Power said: Other than MOVs, what else should I look for when opening the unit? Cheers! Also check the capacitors at the AC-in terminals. On later 48 V models, these are on a separate small PCB near the AC-in terminals. It might also be that the active and neutral to earth capacitors are tripping your protection, i.e. the protection might be too sensitive. 24 V models also have a separate AC to DC battery charger. I don't know anything about it, but it would be worth inspecting.
December 30, 20196 yr Author 10 hours ago, Coulomb said: Also check the capacitors at the AC-in terminals. Thanks. I'll have a look at the AC line filtering class-X and Y safety capacitors
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