bypass not in range

wjmwsm · ‎2025-01-13

Hi, i realise this question has been asked a few times but i can't figure out what is actually wrong as the numbers all look ok in my eyes (very limited experience with these). in the UK so should be 230v i believe. it's happened a couple of times now

KarimEissa · ‎2025-02-10

Hello,

Bypass is used when the UPS has a fault and can't run off the battery. Normally if there is a fault (say the batteries are old and don't hold a charge) the UPS will switch to bypass mode where it simply feeds the input mains AC to the output.

However the UPS still monitors the AC input and if it goes out of range (e.g. the voltage is too high or low) then it won't switch into bypass because it doesn't want to pass that bad voltage through to your connected devices. So the warning basically means the power quality is not good enough, and should the UPS fail and have to go into bypass, it won't - and instead it will just shut off and everything will lose power after turning to battery mode and batteries are discharged as long the mains cut off voltage applied to the UPS

It's nothing to worry about as normally the UPS won't be going to bypass mode.

Having your output voltage set as high as possible provides some benefits (lower current, increased efficiency) so there is no problem having it set higher than the input.

Perhaps check what voltages you have configured as your high and low cutoffs, and adjust these if necessary.

you may try to adjust the out frequency to be 50 Hz+- 3HZ instead of Auto if the loads had privileges to work on that mode ,adjusting the 230 V inverter will modify automatically the upper and lower static bypass ranges ,so you input voltage is fluctuating around 230 VAC then the inverter setting done is accepted ,the bypass out of range declared if the input voltage is not stable at it is out of range 207 VAC to 253 VAC and it would not able to work on automatic bypass at this condition,until the mains are utilized ,at this moment this warning would vanish .

Regards,

Karim

See Answer In Context

KarimEissa · ‎2025-02-10

Hello,

Bypass is used when the UPS has a fault and can't run off the battery. Normally if there is a fault (say the batteries are old and don't hold a charge) the UPS will switch to bypass mode where it simply feeds the input mains AC to the output.

However the UPS still monitors the AC input and if it goes out of range (e.g. the voltage is too high or low) then it won't switch into bypass because it doesn't want to pass that bad voltage through to your connected devices. So the warning basically means the power quality is not good enough, and should the UPS fail and have to go into bypass, it won't - and instead it will just shut off and everything will lose power after turning to battery mode and batteries are discharged as long the mains cut off voltage applied to the UPS

It's nothing to worry about as normally the UPS won't be going to bypass mode.

Having your output voltage set as high as possible provides some benefits (lower current, increased efficiency) so there is no problem having it set higher than the input.

Perhaps check what voltages you have configured as your high and low cutoffs, and adjust these if necessary.

you may try to adjust the out frequency to be 50 Hz+- 3HZ instead of Auto if the loads had privileges to work on that mode ,adjusting the 230 V inverter will modify automatically the upper and lower static bypass ranges ,so you input voltage is fluctuating around 230 VAC then the inverter setting done is accepted ,the bypass out of range declared if the input voltage is not stable at it is out of range 207 VAC to 253 VAC and it would not able to work on automatic bypass at this condition,until the mains are utilized ,at this moment this warning would vanish .

Regards,

Karim

wjmwsm · ‎2025-02-10

thanks for this, we haven't seen the error since so fingers crossed