# Power loss mystery

#### danjdaily

Joined Feb 17, 2007
1
We have a situation in our printing facility with a new piece of machinery. The unit is supplied with single phase 240v 40a circuit.
The power circuit is taken from a 3 phase supply.

The machine looses power and of course shuts down. This happens 5-10 times an hour. In this condition the normal reading of 240v between L1 and L2 drops to 40v. I also measure 40v from each leg to ground.

The lowered power last anywhere from 1 to 5 minutes then returns to normal.

The three legs at the panel read 240v between each leg but to ground/nuetral
L1 to grd = 240v
L2 to grd = 240v
L3 to grd = 0v

We are using L1 and L2 to supply the machine.

In this condition of loss power I measure the incoming lines to the circiut panel and read 40v theres as well but if I open the breaker we have connected to the machine - the power will return to the normal 240v.

We are looking for any help we can get.

The machine is a heat tunnel and impulse sealer.

Thanks - Dan