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

[budm]

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

I cannot tell from the pictures.

[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)

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?

[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)

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

[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.