smx3000rmlv

[johansen]

anyone have any experience fixing these things?

i have one that doesn't charge the batteries. it lists the battery at 99% even if its dead and says "warning state charger low voltage"

once the batteries discharge below some cutoff threshold the warning state is "warning state battery soft start". --which makes sense because there is a NTC resistor and relay to switch the batteries in and out of circuit.

but what i'm wondering is how does it normally charge them. does it use the inverter package and boost converter backwards to charge the batteries? or is there an auxillarary flyback transformer  (both of which appear to be functioning)

no physical components have any visible damage to them.

[asis]

Hi,
First of all, you need to assess the condition of the batteries and pay attention to the serial number of the main unit.
The first numeric values ​​(ASxxx) will indicate the year of manufacture.
From this factor, you can understand the need to replace the batteries.
Approximate service life ~ 5 years.
The charger is located in the main unit behind the battery compartment on a separate PCB.
Since smx3000rmlv (low voltage = 120V) some components, in particular the
transformer, may differ from smx3000rmi (international).
The charger is built on IC900 TNY280GN. Check if the chip is visually damaged, as well as the fuse.
An NTC resistor measures the temperature in the battery compartment and the MPU adjusts the charging current.
If there is an APC9630 / 31 network card, the temperature values ​​in the battery compartment can be monitored via the LAN.

You can search the forum
https://community.exchange.se.com/t5/forums/searchpage/tab/message?advanced=false&allow_punctuation=false&q=simmetra

[johansen]

no, the two small transformers in the system are driven by surface mount uc 3843 and 3842. they both appear to work.

honestly, those small transformers don't have the power handling capacity i would expect a 3kw ups to have, at 50 watts it would take 15 to 20 hours or so to charge the battery fully.

[asis]

Hi,
In any case, when the UPS is connected to the outlet, after checking the health of all nodes and the presence of batteries, it must go to the bypass and the inverter does not will be in the works.
The batteries start charging from the chargers, the power of which should be sufficient.
Since you have an SMX model, I do not exclude that there may be two chargers.
If the batteries are replaced, you need to load more than 30 percent of the nominal and calibrate, indicating the new date on the control panel battery replacement.
Speaking of the transformer, I meant only the charger transformer.
I have studied the SMT1500RMI2U circuit (PCB: 640-3081J-Z-001) quite well and I think there are some similarities.
I will give one more link, although I'm not sure that you will find answers to your questions: 
https://community.exchange.se.com/t5/forums/filteredbylabelpage/board-
id/datacenter-forum/label-name/smart-ups%20%26%20symmetra%20lx%20%7C%20rm

At best, you will be advised to perform the "brain dead" procedure.

("Once I loved APC very much ... but after she became Schneider - I hated her. So it turns out - from love to hate one step").
If not difficult - write a PCB model.