⟐ Marked as duplicate September 22, 2025 at 3:22 MST

WE Nova 1000VA

⟐ Edited by author August 23, 2025 at 0:13 MST

Since the battery was dry, I attempted to revive it by adding water to the cells. Afterward:

1. I reconnected the battery.
2. I turned the UPS on to start charging the battery.

Unfortunately, after charging for a while, I heard a pop and saw a flash of light. I immediately turned the UPS off and noticed the smell of "magic smoke" from one of the components.

I later found out the battery had an internal short. Since then, the UPS hasn’t started.

• Tested the transformer for continuity: it seems fine.
• Fixed two broken traces on the back of the circuit board (see images below).

I am unable to identify which component might have failed. Any advice on what to check next or how to proceed would be greatly appreciated!

• The UPS has not turned on since the incident.
• I suspect some components may have been damaged, but I’m not sure which ones.

⟐ Edited by author December 04, 2024 at 2:37 MST

⟐ Answered August 30, 2024 at 9:29 MST

⟐ Commented August 05, 2024 at 21:29 MST

⟐ Commented July 14, 2024 at 9:31 MST

i have legrand ups up to 60k, when i try to turn it on, it gives EPO error, althouh the jumper behind the machine is connected, and in between the pins 3 and 4

i don't see in the machine settings something related to EPO if NC or NO

is this can be hardware problem?, or how solve?

anyone familiar with legrad ups?

1. The UPS fan is turning on more frequently, like every 10 mins
2. Battery water level is some compartments are dropping more frequently than other compartments
3. Battery acid smell has increased in the recent past, it used to be non existent before
4. Electricity usage seems to have increased significantly in the recent past

I called in a technician from the Sales shop from where I purchased this UPS 2 years ago, he checked the battery load and checked the voltages and said it was fine and asked about battery backup, I said the backup is fine - it is fine, then he suggested to check with Luminous support and suggested it could be due to the UPS over-charging.

Due to the increased Acid smell, I have kept the UPS under bypass mode since last 2 days, but the it still seems to be charging - I can tell this as the battery is still somewhat hot and the UPS fan is running once in a while - not as regular as before, but it is regular.

I checked with a Luminous technician, he said with the symptoms mentioned it must be the issue with battery and suggested to get 2 spare batteries and test voltage cut-off at 27-29V.

I checked with the person who checked the battery first, he said he doesn't have any old batteries in good condition to check this.

I'm not sure what is the next step here. I'm not able to use the UPS now, and even when it's kept it in bypass mode, it is making fan noise once in a while.

How can I diagnose the issue further? Please recommend next steps.

Thanks in advance.

⟐ Commented June 14, 2024 at 7:18 MST

⟐ Commented May 29, 2024 at 19:57 MST

I have a problem with an APC UPS 6kva showing an inverter problem with code 107 and p.13. find a circuit board issue, but I have no idea where to begin.

⟐ Edited March 19, 2023 at 5:06 MST

Maybe someone can help please.

If i connect pos and neg from battery to ups nothing happens but as soon as i take off neg it starts up.

Batter running fine on other ups just not this one.

Thus pos connected plug in it starts up

Pos and neg connected from battery, plug in it doesnt start

Thank you

⟐ Commented July 13, 2022 at 11:02 MST

The board is marked as 2U3K 640-3080_REV04. These are the switches for RY3 (relay).

These parts got destroyed, likely due to the faulty battery (that I’ve now recycled) so I can no longer read their values.

Thanks, Jon.

⟐ Edited August 08, 2020 at 1:10 MST

I have the same problem.

I didn't use mine for like one year and switched it on today.

Suddenly the circuit breaker turned off and once I turned on, the UPS stopped charging on A/C power but runs only with remaining battery power.

I think the PSU of my desktop got malfunctioned after the circuit breaker disconnection incident.

Please help.

UPS : APC 650VA

Power Supply of the Desktop PC : Raidmax 500AF

Thanks

⟐ Commented March 28, 2020 at 7:24 MST

⟐ Commented January 01, 2020 at 5:35 MST

I'm a UPS repairer

how to fix “ output connections cover open” error on the surt15krmxli apc ups?

My V-guard UPS doesn’t charging. If the UPS is plugged in there is no voltage seen on the battery side.

And my UPS is immediately shutting down when it’s turned on.

I don’t have 12v battery so I connect it with 12v adapter, if thats the problem.

I know the shutting down is done by a relay switch

How do I solve it

⟐ Answer deleted March 03, 2019 at 21:18 MST