Hello all readers! I came across the APC Back-UPS CS 500VA BK500-RS UPS. It has been working for a long time, I don’t remember since when. Planned repairs in the form of battery replacement. Otherwise the electronics are fine. There seems to be plenty of material on this UPS on the Internet, but I’ll still make my own article for the story) Let’s start with the characteristics:
Input
Rated input voltage: 230V
Input frequency: 47 – 63 Hz
Input connection type: IEC-320-C14 inlet
Input voltage range when operating from the network: 180 - 260V
Variable (settable) input voltage range: 160 - 282V
Number of power cords: 1
The case of this UPS is plastic, it was once white. Over the course of its use, it turned into a dirty white color, and plus everything, we had this UPS in the server room, where it was repaired. In general, now he is such a handsome speckled man. On the front panel there is a power button for the UPS, and four LEDs that notify us of what is happening with the UPS. There are ventilation holes on the sides at the very bottom. Exactly the same ones are available on the top of the source. Serves for natural cooling.
On the rear panel there is an input connector, a block of output connectors, three connectors operate from the battery in the event of a power outage, and one, marked in gray, is connected to the input connector, but only through a circuit breaker, you will see it below. There is no protection for the telephone line or Ethernet. At the bottom of the UPS there is a battery compartment cover, which is a full-fledged box, and is separated from the electronics board and transformer. I've always liked this about APC. This kind of feature doesn't come across often.
To get to the electronics, we need to unscrew two screws on the back panel, remove it (which is very easy), and then remove one of the halves. Next, to free the board, you need to disconnect the wires. This is where I had to puff. All wires suitable for the power connectors of the rear panel are terminated by soldering. And here is that same WY63 7.0 A circuit breaker. It is installed based on how much the input wire can withstand.
Front panel board. There is nothing special about it: a microphone and four LEDs. But here there is an interesting point. The board is connected with a flat cable, which is not soldered into the board, but is first crimped at the ends, and only then sealed into the board with such tips. A very interesting solution.
All electronics are made on one board. The installation is of high quality, there are no complaints. The board is double-sided, assembly is done automatically. The only thing is that the board is cut a little poorly from the overall blank. So hairy. The main thing is that it’s not like in the riddle: “It’s standing in the corner and it’s hairy.”
The board contains full-fledged interference filters. In addition to the fact that there is a filter at the input, there are a lot of noise-suppressing capacitors installed at the output. A little more detail: choke 420-0053-Z-001, varistor, many JNC X1/Y1 ceramic capacitors.
The power supply is assembled using a pulse circuit using a PWM controller from Power Integrations. The capacitors in the power supply are installed by Jamicon.
There is only one relay installed on the board. It is made of white plastic. DC12V model from OEN India Limited. 
Let's move on to the inverter. It is assembled on two transistors from STMicroelectronics, which are installed on two radiators for cooling.
Next to it there are two transistors from the same STMicroelectronics. One is connected to the winding of the transformer, but I didn’t look where the other is connected, and I didn’t particularly wonder what they were used for.
As I said earlier, APC loves to make complex devices, stuffed with a bunch of protections. From here, a huge number of components and chips immediately grows, which varies from one device to another. On this board were found: two op-amps from ON Semiconductor, a shift register and an oscillator
My UPS has failed.
My UPS is APC Back-UPS CS 500, this also applies to slightly younger and older models that have successfully served their service life of 3-4 years (they don’t last longer - it’s all about the battery).
As a good citizen, I decided to replace the used battery with an original one, which is recommended by the manufacturer. This model retails from 1,500 to 1,800 rubles, and I managed to find a new Back-UPS CS 500 for 2,000 rubles. There is no particular point in buying a battery separately.
The store advised me to buy an analogue of this battery for 450 rubles, and after searching for a similar problem on the forums, it turned out that it was enough to peel off the sticker from the old battery and look at its full characteristics and buy a suitable one.
We peel off the sticker and find there CSB 12v 7Ah 
(Photo not mine, but I had exactly the same battery)
Most stores have exactly the same “battery” in stock at a price of 600-900 rubles (depending on the greed of the seller), I also found it for 550 rubles. But I don't need it.
That's why:
There are 12v 9Ah batteries, which in most cases are identical in size to the “original” one that was in UPS.
Battery manufacturers should be divided according to price/quality ratio:
Yuasa - seems to be the best manufacturer (I haven’t checked, but this statement can be found on the forums from many users)
C.S.B. - a manufacturer of pretty good batteries, which is what APC resells under its own brand
Delta -good batteries at a reasonable price.(One of my friends checked it - the battery lasted 5 years). I advise you to focus on him, because... the price corresponds to the quality 100%.
That’s what I did and bought a Delta HR 12-34W 12v 9Ah for 630 rubles.
Also suitable: Yuasa NPW45-12 12V/9AH and C.S.B. 12V/9Ah HR1234W
A small upgrade won't hurt and for this you will need:
crosshead screwdriver
Soldering iron and accompanying kit
Hot glue gun
1m wire (I borrowed them from an old power supply)
Diode 12 V
Drill with drill
Anti-slip stickers for furniture 4 pcs 
Small plastic clamps
And most importantly - Switch button 
First, glue the rubber pads to the corners, having previously degreased the surface.
I was always annoyed by the sound made by the UPS, but it was not possible to turn it off or turn it down, so I often had to wake up in the middle of the night from its screams. It remains to correct this omission of the manufacturer:
Opening the case:
Unscrew the two screws, then lift the cover up, put it on its side and lift part of the case, so the board with all the giblets should remain in the lower part, and disconnect the upper part along with the red and black cables. We put it aside.
We find the speaker and carefully remove it with a soldering iron and place a couple of pins in its place, for example from one of the connectors of the old motherboard 
We mark the back panel of the UPS with a marker for the appropriate size of the future switch and make a neat hole 
Drill a hole suitable for the size of the diode in the protrusion of the front panel
We connect all parts of the circuit (switch, diode and speaker) using a wire according to a primitive circuit, assemble the wires with clamps and place all the parts in the free spaces in the case, fixing them with hot glue.
Reassemble the body in reverse order.
Outcome:
* Vibration has been significantly reduced
* The sound can now not only be turned off completely, but also replaced with a light indication
* UPS capacity increased by 30%
* Significant savings have been made so that the toad has had his fill and no longer begins to choke at the thought of buying a new UPS.
I tested the new battery, it gets charged and discharges as usual, but it works better than before. Lasted 43* minutes with wifi turned off (* aimak 2009 24")
I hope my experience will be useful to someone and will save money, time and nature.
This model of uninterruptible power supply is also a frequent guest on the desks of service engineers. The APC RS 500, as a rule, works properly for two years, after which a defect appears in almost every source. The first sign of a malfunction is darkening of the upper part of the case due to overheating of the elements. The UPS does not charge the battery to the nominal level; the charging voltage is often no higher than 5 - 8 volts. In this case, the battery fails and the UPS simply does not turn on.
Such a malfunction often leads an inexperienced repairman to make a common mistake. The technician changes the battery uninterruptable power source It turns on and seems to work properly. But this continues until the battery is completely discharged, which then has to be replaced with a new one due to a noticeable loss of capacity. Therefore, it is important to check the charge voltage when replacing the battery. When measuring, the source must be connected to the network, and one of the battery contacts must be disconnected.
APC Back UPS RS 500 is a stand-by type source, the battery is charged from a converter assembled on a UC3843 PWM controller chip.
It is better to install a capacitor with a higher operating voltage and an operating temperature of 105 degrees. If, after replacing C7, resistor R28 does not stop heating, you need to check capacitor C43 or replace the PWM controller chip.
Another malfunction UPS, this is an increased charge voltage to 18 volts. The cause of the defect must be sought in the output voltage stabilization circuit (highlighted in the diagram above). Most often, optocoupler U2 or stabilizer chip IC6 fails.
Also, the stabilization circuit is disabled if the signal CHARGER_EN has a potential above 0.8 volts. In this case, optocoupler U3 should turn on and bypass capacitor C44, which leads to stopping the generator of the PWM chip and turning off the converter. If U3 is faulty, the converter will not turn off, and the output voltage will rise to 18 - 22 volts. Also, if the output voltage is too high, you need to check the serviceability of Q34, C61, C41.
If one of the elements listed above is faulty, after the battery is fully charged, the uninterruptible power supply begins to make quite a loud noise. UPSs of earlier releases are also noisy due to capacitor C22 with a nominal value of 0.1 µF x 400V; later it was replaced by 10 µF x 400V (see photo above).
In almost every source, you can find burnt 10 ohm resistors. These are R150 and R151. They are connected in RC spark extinguishing circuits on the contacts of relay RY3.
 |
Burnt out resistors do not have any noticeable effect on the operation of the UPS, but in order to avoid the need to replace the relay later, the elements must be replaced.
Download the diagram You cannot download files from our server
990-9231 5/03
Connect to device
Back-UPS equipment
On the rear panel of the Back-UPS device there are
the following elements:
Sockets with battery backup
(quantity: 3 pcs.). These sockets provide backup
battery powered, surge protection
and electromagnetic interference (EMI) suppression. At
loss of power supply to these sockets
Power is automatically supplied from the battery. If
Back-UPS device off, power supply to these sockets
(from the network and from the battery) is not supplied. Connect to
to these sockets a computer, monitor, external drive, or
CD-ROM drive.
Socket with surge protection only.
This outlet is always included(if there is voltage in
network), and its state does not depend on the switch On/
Off In the event of a power failure in the power supply network,
this socket is not supplied. Connect to this outlet
printer, fax or scanner.
Turn on the Back-UPS
Note: Before use, let the device
Back-UPS ability to charge during full
eight o'clock.
Press the button on the front panel of the Back-UPS.
Please note that after you press and release the button,
the following should happen:
Green indicator mains power starts flashing.
Yellow indicator battery power lights up
for the duration of the event self-tests.
After successful completion self-tests remains
only green indicator is on mains power.
If the internal battery is not connected, the
green indicator mains power and red indicator
battery replacement. The Back-UPS will also issue
high pitch beep.
On the front panel of the Back-UPS device there are
four (light) status indicators (Powered by
Network, Battery Power, Overload and Replace
battery).
Mains power (green)– lights up in everyone
cases when exits providing
battery, voltage is supplied from the network.
Battery powered (yellow) –
lights up in all cases when the
equipment connected to the outputs,
providing the possibility of power supply from
backup battery, voltage is supplied
from the battery of the Back-UPS device.
Four beeps every 30
seconds– this alarm is generated during
in all cases. when the Back-UPS device
runs on battery. Think about it, no
whether to save the current work.
Continuous beep- this
an alarm signal is given in all cases,
when the battery status approaches
discharged. Remaining operating time from
battery life is very low. Fast
save all current work and exit
all running programs. Turn off
operating system, computer and
Back-UPS device.
Overload (red)– lights up in everyone
cases where electricity consumption
exceeds the capacity of the Back-UPS.
Continuous constant tone –
this alarm sounds in all
cases when exits providing
Possibility of power supply from backup
batteries are overloaded.
Fuse– safety button,
located on the rear panel of the device
Back-UPS, pops up when pressed
position if overload forces Back-
UPS disconnects from the network. If the button
jumped out of the pressed position, turn it off
equipment whose operation is not so
important. Reset fuse to original
position by pressing the button.
Replace battery (red)–
lights up whenever the time limit expires
operation of the battery, and also if
The battery is not connected (see above).
A battery whose service life
expires, does not provide sufficient
operating time and needs to be replaced.
High tone signal for 1 minute
every 5 hours- this alarm
is supplied in all cases when the battery is not
passes automatic diagnostic tests.
Placement/connection
When placing the Back-UPS, avoid:
Direct sunlight
Excessively high temperature
Excessively high humidity or contact with any
liquids
Connect the Back-UPS to an outlet as shown
in the picture.
Back-UPS Internal Battery
always charges when the device is connected to
socket.
Protect your phone line
from power surges
Phone ports provide surge protection
voltage caused by lightning strikes for any
devices connected to the telephone line
(computer, modem, fax, telephone). Telephone ports
meet the requirements of HPNA (Union
household telephone lines) and DSL (Digital Subscriber Lines)
lines), and also allow you to use modems with any
data transfer speed. Make a connection,
as shown in the picture.
Wall socket
Modem/fax/telephone
Turn the device on the side wall. Slide
battery compartment cover up and remove it from
UPS devices.
Pull out the battery until you have access to
its terminals and connecting wires. Disconnect
wires from terminals.
Slide the new battery into the battery compartment.
Connect the wires to the battery terminals as
indicated below:
Black wire - to the ground terminal (-).
Red wire - to the positive terminal (+).
Align the battery compartment cover with the slots
UPS devices. Move the lid down until it
will not latch.
Device
Management
user
Installation
Connect the USB cable and
install software
provision
(not required)
To replace the internal battery, follow these steps:
Note: Replacing the battery is not dangerous. However, during this process it may
slight sparking is observed. This is normal.
Replace the internal battery
APC, Back-UPS and PowerChute are registered trademarks of American Power Conversion. Everything
All other trademarks are the property of their respective owners.
Power cable for your computer
instructions, instructions
will appear on
NOTE(for computer users
Mackintosh): In order to maximize
take advantage of high-speed
USB interface, you will need an operating system
Mac OS 10.1.5 and higher.
If Autoplay is not allowed on your computer,
complete the following procedures:
On your computer desktop, double-click
mouse over the My Computer icon.
Double-click on the driver icon
CD-ROM device and follow the instructions
which will appear on the monitor.
Status indicators and alarms
Ordering a spare battery
Typical battery life is 3-6 years (depending on the number of discharge cycles and operating
temperature). A replacement battery can be ordered from APC.
When ordering, please specify the battery cartridge RBC2.
Voltage and sensitivity adjustment (optional)
In cases where the Back-UPS or equipment connected to it exhibits increased
sensitivity to input voltage level, voltage adjustment may be required. It's simple
procedure carried out using a button on the front panel. To adjust the voltage, do
following:
1. Connect the Back-UPS to a wall outlet. The Back-UPS will be in standby mode
(indicators are not lit).
2. Press the button on the front panel all the way and hold it for 10 seconds. All device indicators
The Back-UPS will begin flashing to confirm that it has entered programming mode.
3. The Back-UPS will then display the current sensitivity level setting as follows:
table.
4. To select a low sensitivity level, press the button until the light starts flashing
yellow indicator.
5. To select a medium sensitivity level, press the button until the
yellow and red indicators (second and third from the top).
6. To select a high sensitivity level, press the button until the
yellow and both red indicators (lower three).
7. To exit this mode without changing the sensitivity level, press the button until
The green indicator will start flashing.
8. In programming mode, if the button is not pressed within 5 seconds, the Back-UPS exits.
programming mode and all indicators go out.
following
indicators
sensitivity
Voltage range at
entrance (for work
auxiliary system)
Used in the following
conditions
160 - 278 VAC
Input voltage is very low
to power the computer.
(yellow and
(default)
180 - 266 VAC
Back-UPS often
switches to work from
battery
(yellow and two
196 - 256 VAC
Connected equipment
sensitive to deviations
This model of uninterruptible power supply is also a frequent guest on the desks of service engineers. The APC RS 500, as a rule, works properly for two years, after which a defect appears in almost every source.
Repair of uninterruptible power supply APC-500:
The first sign of a malfunction is darkening of the upper part of the case due to overheating of the elements. The UPS does not charge the battery to the nominal level; the charging voltage is often no higher than 5 - 8 volts. In this case, the battery fails and the UPS simply does not turn on.
Such a malfunction often leads an inexperienced repairman to make a common mistake. The technician changes the battery uninterruptable power source It turns on and seems to work properly.
But this continues until the battery is completely discharged, which then has to be replaced with a new one due to a noticeable loss of capacity. Therefore, it is important to check the charge voltage when replacing the battery. When measuring, the source must be connected to the network, and one of the battery contacts must be disconnected.
APC Back UPS RS 500 is a stand-by type source, the battery is charged from a converter assembled on a UC3843 PWM controller chip.
The circuit starts when the voltage on capacitor C7 reaches 7.8-9.0 volts. This voltage is obtained at the divider R28, R139. After startup, the PWM controller is powered from the transformer via the diode circuit D7, R50. Due to the leakage of this same capacitor C7 (22 μF x 16 V), resistor R28 begins to heat up, the output voltage of the source decreases, as well as the battery charge.
It is better to install a capacitor with a higher operating voltage and an operating temperature of 105 degrees. If, after replacing C7, resistor R28 does not stop heating, you need to check capacitor C43 or replace the PWM controller chip.
Another malfunction UPS, this is an increased charge voltage to 18 volts. The cause of the defect must be sought in the output voltage stabilization circuit (highlighted in the diagram above). Most often, optocoupler U2 or stabilizer chip IC6 fails.
Also, the stabilization circuit is disabled if the signal CHARGER_EN has a potential above 0.8 volts. In this case, optocoupler U3 should turn on and bypass capacitor C44, which leads to stopping the generator of the PWM chip and turning off the converter.
If U3 is faulty, the converter will not turn off, and the output voltage will rise to 18 - 22 volts. Also, if the output voltage is too high, you need to check the serviceability of Q34, C61, C41.
If one of the elements listed above is faulty, after the battery is fully charged, the uninterruptible power supply begins to make quite a loud noise. UPSs of earlier releases are also noisy due to capacitor C22 with a nominal value of 0.1 µF x 400V; later it was replaced by 10 µF x 400V (see photo above).
In almost every source, you can find burnt 10 ohm resistors. These are R150 and R151. They are connected in RC spark extinguishing circuits on the contacts of relay RY3.
Burnt out resistors do not have any noticeable effect on the operation of the UPS, but in order to avoid the need to replace the relay later, the elements must be replaced.
Replacing the APC-500 UPS battery:
