Most Conveyors start in slow speed (or Idle) when the machine starts like: Printing machines, Plastic, Extrussion, Fabrics, etc. and most of the times it takes a while for the whole machine to start operating at Normal Speed because the operators have to make adjustements.
If they use AC Drives to run at slow speed (Less than 18 Hz. that is 1/3 approx. of its full range) which in most cases OVERLOADS the drives and trip them, or trip the breakers which feeds them.
AC Drives have that "Problem" when they run at slow speeds.
Often you need the machine to run at low speed and AC drives are not made for that, they draw a lot of current, higher than what the AC Motor can handle and many times they both burn. This problem is very common in printing (Press), plastic, extruders, and fabrics companies and it causes many times problems with their production. In top of that the motor's torque is not good at all at that speed.
DC Motor Drives solve that problem, because the have full torque from 1 RPM to full speed, they are cheaper and easier to work with.
Someone may say DC Motors requiere more maintenance than AC Motors. I had work many years with both AC & DC Motor and Dives. Both types require maintenace, (Bearings, lubricate, etc.) DC Motors need brushes to be replaced after 1 or 2 yaers but they run good if you give them good maintence as it suppouse to be.
Besides you 'll save energy and have better performance. Visit www.aucontrols.com and start saving energy.
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