what does it means the boost/trim rly fault code

brummbear_apc · ‎2021-06-28

This was originally posted on APC forums on 3/5/2020

Hi guys

we have a Smart-UPS 1000 and yesterday was a happening because the device turned off without any previous sign. The problem was the next:

the device could turn on but it couldn't supply the other devices and it showed, we have to contact with APC immediately or something like this.

I wasn't there so I don't whats happend exactly. Today I tried to turn on and magicly it could turn on without any problem.

I read out the logs and I've found 6 fault code "boost/trim rly".

Please help me what does it mean because I don't find any useful info about it.

The battery was replaced last July.

Brad_C · ‎2021-06-28

This was originally posted on APC forums on 3/5/2020

It means the UPS is seeing an output voltage outside of what it expects to see. The most common cause of that is a relay weld on the boost/trim relay(s).Other hardware failures can cause the same issue.

If it powers up and runs ok and there is a faulty relay, next time you experience a power transient that would normally cause the UPS to boost or trim it'll quite likely happen again and you'll lose your load.

See Answer In Context

Brad_C · ‎2021-06-28

This was originally posted on APC forums on 3/5/2020

It means the UPS is seeing an output voltage outside of what it expects to see. The most common cause of that is a relay weld on the boost/trim relay(s).Other hardware failures can cause the same issue.

If it powers up and runs ok and there is a faulty relay, next time you experience a power transient that would normally cause the UPS to boost or trim it'll quite likely happen again and you'll lose your load.