Compressor contactor trips

[Hill Top]

blessed day all, i have a 3PH,15HP, RPM-1775, V-230/460, AMP 37.1 Motor. Compressor Starter rating of 460VAC/ 15HP/3PH , why it keep tripping???

 

[Pete999]

blessed day all, i have a 3PH,15HP, RPM-1775, V-230/460, AMP 37.1 Motor. Compressor Starter rating of 460VAC/ 15HP/3PH , why it keep tripping???

What are the overloads set at, what exactly is tripping, RCD MCB or the contactor itself

 

[Hill Top]

What are the overloads set at, what exactly is tripping, RCD MCB or the contactor itself

The contractor it self is whats tripping.

 

[snowhead]

That's the overload, attached to the contactor.

The most likely fault with a compressor tripping the oveload is the compressor unloader valve sticking.
It relieves the pressure on the compressor at start up, it's what causes the air hissing at compressor switch off and start up.

 

[Hill Top]

That's the overload, attached to the contactor.

The most likely fault with a compressor tripping the oveload is the compressor unloader valve sticking.
It relieves the pressure on the compressor at start up, it's what causes the air hissing at compressor switch off and start up.

After reading your message i went and check the unloader valve, realizing that its not unloading like it should.It will spit out some then stop then spit out again then stop. Only if I turn the power (120v) off then on again it will do that. So i'm gonna take it off and see whats inside or if thats even possible. will keep you posted on progress. thanks

 

[Hill Top]

Blessed Day
I've found the issues with the compressor. There is dryer connected to the compressor and the unloader valve on the dryer constantly releases air causing the compressor not to reach it max PSI, which in return cause it to drip (overheat).