breaker trips when transferring power to generator

[Terminator5047]

But I will say the closer to ligning up phase you go the longer it takes

 

[hillbilly1]

You should check the settings on the ats to how close to phases lining up before making the switch the farther out the phase angle the more inrush. Does it trip on the switch from normal to emergency or from emergency to normal. I’ve also seen new roof top units on the switch go to a reset cycle and it had 4 compressors in it that would all be calling for cooling in the hot summer and all them would come on at once causing massive inrush tripping the breaker. So to solve that I tightened up the phase angle and then I took a 2 wire from the ats elevator recall contacts to the plc In the hvac unit and had the Trane guy write a program saying hey we are testing and to stage the compressors back on one at a time vs all at once.

The op is not having an issue with the generator or generator load breakers tripping, it is a breaker totally independent of that system.

 

[hbiss]

he op is not having an issue with the generator or generator load breakers tripping, it is a breaker totally independent of that system.

Apparently the UPS is "hiccuping" on the noise or dirty power caused by the transfer that's induced into the power system.

-Hal

 

[hillbilly1]

Apparently the UPS is "hiccuping" on the noise or dirty power caused by the transfer that's induced into the power system.

-Hal

It should be able to filter that out, that’s part of its job. There is something else going on…..

 

[hillbilly1]

Just thought of something else to check, does the breaker have a shunt trip module? The control circuit may be using a electrical held contact which is closing on loss of power (bad design)

 

[hillbilly1]

The more I think about it, the more it makes sense, it is not uncommon to have shunt trip breakers feeding a ups, usually tied to the computer room EPO switch, and sometimes tied to the smoke detectors in the computer room. I think the op will find that’s the issue that’s causing the breaker to trip. In the old days, they used N/C contacts on EPO switches, but the last one I connected had all N/O contacts.

 

[ATSman]

The more I think about it, the more it makes sense, it is not uncommon to have shunt trip breakers feeding a ups, usually tied to the computer room EPO switch, and sometimes tied to the smoke detectors in the computer room. I think the op will find that’s the issue that’s causing the breaker to trip. In the old days, they used N/C contacts on EPO switches, but the last one I connected had all N/O contacts.

I agree and think you may have nailed it

 

[hillbilly1]

Probably be another post where the OP disappears, and we never find out! LOL!