APC SMT3000rmi2u battery not charging - Page 1
Forum section: electronics / repair

author: stdav85
author_rank: Newbie
timestamp: June 30, 2023, 05:10:51 pm
content: HiGood day everyone!I am having issue with my APC is not charging batteries i have checked voltage coming 41.0V DC.It must be 54.6 as per APC standards its 48V APC.Batteries are new if anyone knows please help there is no schematic i have tried online.There must be some resistor or capacitor issue because it’s giving 41V.If I remove batteries still APC not giving battery error and showing me battery 60% charging Zzz.Kindly help thank you.

author: asis
author_rank: Frequent Contributor
timestamp: July 01, 2023, 01:23:52 am
content: Hi,What PCB model is installed in your UPS (640-30xxx)?The charger module PCB is installed on the back of the device: 133674AB15653583.Check fuse F900 (1A/250V) and visually check the condition of IC900 (TNY280GN).If there is no obvious damage, then you can try to connect the charger itself to the network in series through an ordinary incandescent lamp or via a laboratory PSU (connector J9010).A charger without external control circuits should output, on the order of 27V DC on connector J906 pin1 (plus), pin 8 - GND.

author: stdav85
author_rank: Newbie
timestamp: July 01, 2023, 01:43:29 pm
content: 640-3080–Z-001 charge module.2U3K 640-3080_ REV 04 Main board

author: stdav85
author_rank: Newbie
timestamp: July 01, 2023, 03:51:23 pm
content: Quote from: asis on July 01, 2023, 01:23:52 amThanks have tested f900 and IC900 pretty fine and there is no damage at all in charge module.I started unit without charge module my battery voltage 47V so i started APC without charge modular after shifting to utility i removed batteries still apc is not sensing batteries removed and showing batteries connected on display and giving 38V DC instead of 54.6.Problem in main board somewhere charge module is fine any idea please?

author: asis
author_rank: Frequent Contributor
timestamp: July 02, 2023, 05:21:26 am
content: Hi,Before moving on to hardware problems, I would like to clarify some issues.As far as I know - these devices are discontinued.You originally said the BAT's voltage was 41V, now you're saying 47V.You can see the year of manufacture of the UPS in the first digits of the serial number (ASxxxxxx), and as a rule, the battery life is about five years.If you did not turn on the UPS for a long time or disconnected the batteries for replacement, you will need to answer "YES" to the replica from the "NEW BATTARY" control panel, this will start the calibration mode.The most common suggestion on the APC forum is to perform the "BRAIN DEAD" procedure, clearing all errors.https://community.se.com/t5/forums/searchpage/tab/message?advanced=false&allow_punctuation=false&filter=location&location=forum-board:datacenter-forum&q=smt3000rmi2uItWill take quite a long time for the batteries to be fully charged.You can see this on the control panel.If you have an NMC AP9630-AP9631 network card installed, you can monitor the charging process and battery status via LAN.--Did you turn on the charger autonomously and what voltage does it give out?I don't have a diagram of this UPS model, probably all the batteries are connected in series and the charger has different parameters with the same circuit.In addition to the main charger, there is also an additional charge "GREEN MODE".Q914 and built-in MOSFET's diodes are used to recharge batteries when reverse current flows in the transformer.https://www.eevblog.com/forum/repair/apc-smartups-overload/APC####.pdf

author: stdav85
author_rank: Newbie
timestamp: July 02, 2023, 05:32:42 pm
content: Quote from: asis on July 02, 2023, 05:21:26 amHiI charged batteries with external dc charger so its reached 47VBatteries are new one month old only.Even removing batteries APC doesn’t respond that batteries are removed and giving 36 to 40V DC without batteries.It must be 54.6v DC.So there is some hardware issue

author: asis
author_rank: Frequent Contributor
timestamp: July 03, 2023, 09:44:37 am
content: Hi,You can take a picture of the charger from the side of the components.Have you tried to connect only the charger module to the mains and measure the voltage at theJ906 pin1 (plus), pin 8 - GND connector without connecting to anything?

author: stdav85
author_rank: Newbie
timestamp: July 03, 2023, 11:52:25 am
content: Quote from: asis on July 03, 2023, 09:44:37 amYes have tried and voltage are okay with pin 1.All components are good in charge controller .APC isn’t detecting batteries once batteries are charged full from external charger and voltage 54 for batteries after I connect to APC is showing battery bar 95% charged.But when i remove battery connector on running state apc is showing batteries 35% and not giving warning that batteries are removed.

author: asis
author_rank: Frequent Contributor
timestamp: July 03, 2023, 02:33:37 pm
content: If you disconnect the battery - the power may be from the charger.The charge voltage increase / decrease control occurs on the contacts, respectively,J904-pin5; J904-pin3 from IC11 ATMEL 89C51RC-UM (P1.4-pin6; P2.0-pin24).What is the voltage at J904 (#L906) pin1 without load and with the main PCB connected?The charger is somewhat different from what I have and if you give a picture of the back of the PCB it will be easier to understand.All the schematic fragments that I have refer to SMT1500RMI2U PCB 640-3081J-Z-001 (BAT-24V).

author: sdav94
author_rank: Contributor
timestamp: July 03, 2023, 03:13:15 pm
content: Let me clarify i removed charger from main board and turn on apc without charge modules same result still showing battery fake percentage and same output volt 37 sometimes 41.If main board is okay apc cant start from utility power without batteries and charge module.Yes it can still turn on without charge module if you connect batteries and utility power.It can be software issue? Or hardware?

author: sdav94
author_rank: Contributor
timestamp: July 04, 2023, 06:35:16 am
content: Quote from: asis on July 03, 2023, 02:33:37 pmHave noticed before when apc went to charge mode fan noise was there but now no noise fans are running quietly. I have checked today 46V are coming.Its keep going down and up but maximum reaches 46 so I drained my batteries to 44V then APC started charging and fan noise also there but when it reaches 46V charging stopped fan noises stopped too.

author: asis
author_rank: Frequent Contributor
timestamp: July 04, 2023, 09:43:29 am
content: Hi,This is fine.The fan has two modes of operation - in normal mode from (+12V) and during inverter operation, as well as in battery charge mode from (+24V).Switching comes from IC11 ATMEL 89C51RC-UM (P1.2-pin4)->Q42->Q44/Q47 MOSFET's N-Ch IRML6302 connector J10/J10A.If the battery charge has not reached approximately 30 percent, then the fan will rotate at an increased speed.Temperature control in the battery compartment is performed by the NTC sensor -> connector J1-> IC10 pin7 TLC0838I Texas Instruments.The multiplexer of this circuit controls a number of important UPS nodes and transmits data from pin14 (DI / DO) to IC11 89C51RC-UM (P3.4-pin16).Critical overheating of the MOSFET's of the inverter is controlled by a thermoswitchTS1 (SEKI ST -22 L6 105*C) HS4 connected to the P0.6-pin37 port of IC11.BTW, the voltage level of the charger is controlled by the same IC10 pin1.

author: sdav94
author_rank: Contributor
timestamp: July 04, 2023, 03:30:58 pm
content: Quote from: asis on July 04, 2023, 09:43:29 amGeniusIs there any possibility that i can increase battery charging amps? By default when batteries are empty apc will charge 3 to 4 amps maximum thats not enough if we are going to use extra bank for batteries.My problem is still there still low voltage from DC output it can be software issue?

author: asis
author_rank: Frequent Contributor
timestamp: July 05, 2023, 06:29:27 am
content: Hi,So far, I can't tell what the problem is, based on what you want to upgrade there and what the true state of the UPS is.I am not clear on the history of the development of events and the practice of operating your UPS.Also, you do not write what you observe on the display panel in the course of your actions.First, I'd like to see a picture of the underside of the charger, which I asked you to.Forcing the parameters of the charger may end badly.And, in general, you should have a deep understanding of what you are doing and how.-I do not rule out that the problem is in the MPU IC11 firmware, but flashing and calibrating via RS232 in the traditional sense is impossible - there is no direct communication with the MPU.Everything happens through IC603 STM32F103 and NMC AP9630-AP9631.The SW is updated via a Flash drive.In extreme cases, you can connect to the MPU via the J606 technological connector(pin3 -TX; pin5 - RX *=TTL), taking into account the ALE / PROG pin33 signals and PSEN pin32 (89C51RC), while the communication module STM32F103 (J710) probably needs to be disabled (if it is removable).In addition, a correct firmware dump is needed for this generation of UPS's.Constant profiles and serial number are stored in IC8 93C46.I still do not understand, did you perform the "BRAIN DEAD" procedure and waited for some time to discharge all ECAP's?Q44/Q47 MOSFET's P-Channel.Sorry.

author: stdav85
author_rank: Newbie
timestamp: July 05, 2023, 05:04:55 pm
content: there is no load and no battery attached but it’s showing me load and battery percentage.I did “Brain Dead” procedure but still same.Some noise are coming near to fan side even I removed fans to confirm its not from fans.

author: asis
author_rank: Frequent Contributor
timestamp: July 06, 2023, 03:07:38 am
content: -It is possible that you have some kind of relay stuck or the MOSFET that controls it is faulty.Also, check the capacitor C916 (~85pF) and R932 (1.5kOm).Check the strings of series resistors R701, R730, R702, R739, R703 and R705, R706, R707, R708, R709.They are high-resistance - about 1mOm (see ratings).Relay RY902, installed on the PCB of the charger, controls the output group sockets and does not matter yet.

author: trunglqvtv
author_rank: Newbie
timestamp: July 24, 2023, 08:20:30 pm
content: I also have this model ( SMT3000rmi2u) but can not cold start, when press On so it suddenly turn off everything but no fault codein video:

author: asis
author_rank: Frequent Contributor
timestamp: July 26, 2023, 02:51:45 pm
content: Hi,If the UPS is connected to an outlet and, even if the power button is not pressed, the charger must in any case provide voltage to charge the battery and power the main circuit.This can be checked on connector J906/905 (pin1 OUT 27-57V DC; pin8 GND).Thus, the main PSU, assembled on IC12 (TL3843), is powered.It generates voltages +5V(IC600);+5(IC9);+12V (Catode D44);-9V(- C714 22x50V); +24V to power all relays.First, check the charger from the description that is in the posts above.