CyberPower 2200E not switching to AC power (0V output)

[emilije]

Hi to all,

I have CyberPower Value 2200E-B UPS which is not bypassing AC input to load.
When connected and turned on to AC 230V it does not show any error, it passes self test and on display it's shown input & output voltage, batt capacity and load - everything as it should be. Problem is that there is no output voltage (0V!) on any socket (only when connected to AC 220V!) However, when switched to battery power (eg power failure) UPS works normally, it switches to battery and output voltage is stable 220V.

I've tested all relays and they are OK, (voltage on their coils are 0V when UPS is on AC power). Charging of the battery works.

Any ideas or schematic would be appreciated.

[budm]

Re: Cyber Power 2200E not switching to AC power (0V output)

Since the relay are DPDT, are the contacts switching when the relay coil is activated?

[emilije]

Re: Cyber Power 2200E not switching to AC power (0V output)

@budm

Sorry for confusing you. UPS is not activating relays when on AC power.

I've tested relays separately, by giving them known +12V from lab power supply and measuring resistance over contacts. They are tested good.

Any other hints except relays?

[budm]

Re: Cyber Power 2200E not switching to AC power (0V output)

Have to trace the wires from the outlets back to board to see which relays are used for bypassing the UPS when not in batteries mode, the complicate part will be that I believe that this UPS also has AVR (Automatic Voltage regulator using transformer tap switching) to maintain the AC output and will kick into UPS mode when it is out of regulation range or when it detects the lost of the incoming AC.

Is this the one you have?

[Elysarian]

Re: Cyber Power 2200E not switching to AC power (0V output)

Is it just me or does there appear to be some scorch marks around the components between transistor Q5 and the buzzer? (BZ1)

I'd guess that transistor is used to switch the relay next to it - might be somewhere to start?

[budm]

Re: Cyber Power 2200E not switching to AC power (0V output)

I cannot tell from the pictures.

[emilije]

Re: Cyber Power 2200E not switching to AC power (0V output)

Thank you for helping me guys.

@budm
yes that's the correct UPS and it has AVR function. Relays you were looking are lower two (NOT the two around the buzzer).

@Elysarian
There is no scorch, but some solder flux traces -that part was repaired i can see it how two resistors and diode nearby are soldered together (note that ups was repaired earlier, before i got it. Don't have any info why and was it working after)

I think that relays are driven by transistors MPSA42 (to-90) which are near relays

If needed, tomorrow i can provide you better pics of wiring with AVR transformer

[cheapie]

Re: Cyber Power 2200E not switching to AC power (0V output)

Are all the connectors inside making good contact? I had an APC UPS do this once. The cause was a connector inside that had caught fire and burned up.

[emilije]

Re: Cyber Power 2200E not switching to AC power (0V output)

@cheapie

that was checked first Yes, all contacts are good!

Other suggestions?

[emilije]

Re: Cyber Power 2200E not switching to AC power (0V output)

Hi,

So here are pics of transformer and wiring:

Wiring goes like this;

1 - blue, from the AC input
2 - brown, from AC input
3 - blue, (thin) from transformer primary
4 - white, to output sockets
5 - black, from transformer primary
6 - yellow, from transformer primary
7 - black, to output sockets (for soldering on the board)
8 - blue/white wires (on conn) from transformer secondary
9 - fan
10 - red, (thick) from transformer secondary
11 - brown (thick), from transformer secondary
12 - blue (thick), from transformer secondary
13 - those two thick wires from board goes to the battery

Does anyone have a better clue now what could be wrong here and where to start?

[budm]

Re: Cyber Power 2200E not switching to AC power (0V output)

OK, this is what I come up with:
When you apply the AC to the unit, the relay A and B should turn on, relay B and C can be off if the AVR does not kick in, the out will either get the power directly from the L through normally closed contacts of relay C and D or it may select the output form the transformer Black wire if C is ON, or from Yellow wire of the transformer if D is ON. I do not know which one of the transformer wires are for Buck and Boost winding. But as you can see how the L (HOT) get connected to he outlet L.

[budm]

Re: Cyber Power 2200E not switching to AC power (0V output)

Here is the relay's switching diagram.

[SusiBiker]

Re: Cyber Power 2200E not switching to AC power (0V output)

Hi.
Sorry to leap on this thread, but I have one of these Value 2200E beasties too.
My problem is that the AVR thinks the mains voltage is wandering between 196VAC and 225VAC. This is causing the thing to do the opposite and energise the inverter.
I suspect it may be a dodgy cap somewhere, BUT, if the board is pressed gently with a plastic rod, I can make the inverter switch on and off. This points to a possibility of a dodgy joint as well, er, or just the Cap.
It would really help to be able to locate a circuit diagram (schematic). If you do not have one available, could you possibly advise where to buy/get one?
I've tried to by one from CPS Europe, but they were not interested in selling one.

Any ideas where to look for the fault, or to get hold of a circuit?
Thanks,
Susi.

[mladen82]

Re: Cyber Power 2200E not switching to AC power (0V output)

I have identical problem with this UPS.
I found near all 22uF/50V caps are bad, and one 47uF/63V.
But still problem is exist, no voltage from mains 220V.

[mladen82]

Re: Cyber Power 2200E not switching to AC power (0V output)

Problem solved!
Re-soldered solder joints for all relays on pcb (there are 4 of them). Seems that were cracks in solder. First remove them completely then rework by new soldering.
Also replaced all 22uF/50V and 47uF/63V capacitors.

[mladen82]

Re: Cyber Power 2200E not switching to AC power (0V output)

Unfortunately, UPS come back for repair.
Same problem.

I found that -15V voltage is actually -10.5V. Checked all components in circuit for generating -15V but all seems ok.
I can't find out why this voltage is not good, its not voltage regulated, no regulator, delivered by LM324 op amp probably some pwm configuration.

I doubt that PCB maybe since is double-side have some bad via connections.

ps. i have schematic and service manual so anyone if need, contact by pm.

[budm]

Re: Cyber Power 2200E not switching to AC power (0V output)

Up loading the service manual will be better so any one here needs it can just download it.

[mladen82]

Re: Cyber Power 2200E not switching to AC power (0V output)

I think that finally find root cause of problem.
It is a NPN transistor MPSA42 in TO-92 package (Q9) that drive main relay, precisely there are two of them but only one was bad (diode test-open circuit both base-emiter, base-colector).
I change both MPSA42.
UPS works for now, will test couple of days.

[larrymoencurly]

Re: Cyber Power 2200E not switching to AC power (0V output)

I think that finally find root cause of problem.
It is a NPN transistor MPSA42 in TO-92 package (Q9) that drive main relay, precisely there are two of them but only one was bad (diode test-open circuit both base-emiter, base-colector).

Does it have a protection diode across it or the coil? My brother had a car with a relay controlled by a 555, and every few months it would blow its driver transistor rated for 300-400V. No more failures after a 600V diode was soldered across the relay coil.

[Brandi008]

Re: Cyber Power 2200E not switching to AC power (0V output)

Hello everyone,
I have a CyberPower Value 2200E that have the problem of charging the battery. Checking the electrolytic caps and find the same as Mladen82 : most of the 22uF/50V were defect, especially C3, C37, C39 and C41 that have about 13uF instead of 22 , ESR of 150 ohms and a Vloss of 30% ! As I was on the way, I've changed all the electrolytic caps. Then the unit work again.
I was wondering why this 4 caps were so bad. Except C3,they physically are located near the L7815CV (+15Vdc) regulator. It has a heat sink. I found this become quite very hot. I've put a temp probe and measure near 80°C ! I've then tried to put a little fan to cool and get max 40°C at normal work, much better. It is right the cooling is not the strong point of UPS's, but with a little modification (I'm on to build), I'm sure this will extend the life of my UPS.
The +15V is mainly use to drive the relays. Current is about 67mA each. At minimum 2 relays are active (up to 4 in boost mode).

@mladen82 : thanks for the service manual.

I've also notice that -15Vdc is around -10Vdc. Do not know if this is right or not. Like Mladen82 explains, there is no regulator for this -15Vdc.

@Larrymoencurly
There is no diode on the relay's coil, but a 10k resistor.

Regards,
Brandi008