I have two APC MTX5000 units on had a "battery charger failure, and the other was fine.
i removed both electronics units and compared them to find the fault with the charger.
After I did that, I replaced the working unit onto the base and reconnected the batteries.
However, when I started the UPS, it now fails.
The failure toggles between MAIN RELAY FAILURE and BYPASS RELAY FAILURE.
i used DEOXIT to clean all the contacts, cleaned out the upper and lower units of dust, and checked all the relays I could find.
No bad relays were found and the contacts are spotless.
what gives on these units?!
How and why is this happening suddenly and where do I look to resolve it?
Choose a location