what is under voltage trip?

[mateen]

hi every one i wanna know that what is under voltage trip? your reply must appreciate thanks advance:goofy:

 

[Darkwood]

With regards to what?, you can get voltage monitor devices which will trip if the voltage drops too far.... also coils in contactors and relays will work within a set voltage range if your voltage drops below this then it will fail to hold the contactor in and drop out....
Not sure exactly what your after here but its kind of 'does what it says on the tin' voltage too low or disappears then device trips.

 

[Engineer54]

These devices are normally protection relays used in all sorts of situations. We also use them on our main MV and LV Auto switchboards on the main incomers. Most incorporate a time delay, both on loss of voltage and on resumption of supply voltage. Another use, is for auto start-up of stand-by generators to take over power suppy on loss of main power...

As i said, they have many uses and used throughout the industry, but mainly in the industrial and larger commercial sectors....

 

[SirKit Breaker]

Just to add to the other 2 replies, there is also Under Voltage Protection. This is where the voltage, for whatever reason has dropped, and as a result the machine for example has stopped working. When the voltage is restored, the machine must not restart automatically, there must be some sort of human intervention to restart the machine, i,e a start button. A good example of this is an E stop, i know an E stop has nothing to do with undervoltage, but if you push it in, the voltage drops, and the machine stops, when you pull it out, the machine will not restart until you press the start button.

Cheers..........Howard

 

[jumpin jax]

A good example also would be a DOL starter