Sorry to be unclear and thanks for the reply jazzcnc, I was referring to hot drivers.
I got them cooler and a bit more torque by un-ticking the invert pulse mode, and switch the DIP switches to 5 amp.
Not as much torque as inverting the pulse, but the drivers are much cooler.
I red on the following post that the Amps settings of these drivers are correct, and I'm probably save.
http://forum.planet-cnc.com/viewtopic.php?f=9&t=1107

I will do some tests next week to see if the machine has enough torque.If not, I will go back to inverting the pulse rate and ad some fans on the drivers.