Jump to content

Axpert MKS-3K-24 AC Input Short Circuit


Kilowatt Power

Recommended Posts

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!

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...