APC 650 Back-up UPS does not switch on.

Anonymous user · ‎2021-07-01

Hello gurus, My APC 650 Back UPS does not switch on when connected to the main power supply. Can anybody help me with a circuit diagram? An initial physical observation has revealed that the a-c contact relay does not energize. An immediate switching transistor does not have any voltage there and this is connected to another IC. Please any help? kyei

BillP · ‎2021-07-01

Hello,

We cant provide you with schematics here because they are proprietary (Where can I find schematics for my APC product? | FAQs | Schneider Electric US) and we can only help with some basic troubleshooting. It sounds like maybe you are beyond that though where you have verified it is not turning on due to a hardware fault versus because the input voltage/frequency is out of range, electrical noise, etc.

Can you coldstart the unit off of its battery if you unplug it and hold down the power button? Does it do anything? Maybe not based on what you already found.

lastly, these units are not user serviceable so if you do attempt to repair it or someone else helps you here, please understand its at your own risk.

See Answer In Context

BillP · ‎2021-07-01

Hello,

We cant provide you with schematics here because they are proprietary (Where can I find schematics for my APC product? | FAQs | Schneider Electric US) and we can only help with some basic troubleshooting. It sounds like maybe you are beyond that though where you have verified it is not turning on due to a hardware fault versus because the input voltage/frequency is out of range, electrical noise, etc.

Can you coldstart the unit off of its battery if you unplug it and hold down the power button? Does it do anything? Maybe not based on what you already found.

lastly, these units are not user serviceable so if you do attempt to repair it or someone else helps you here, please understand its at your own risk.