> Since you still have some of the old drives, check the limit > current on them, and compare to the new one. > Some drives have fancy stuff, such as reducing frequency > when at limit current, thereby slowing the motor.
If current limit is hit torque which is proportional to current will be limited. If torque above the limit is needed speed will go down. > Anyway, it SEEMS like the problem is more likely in the VFD > than the motor. Generally, a motor will be able to put out > QUITE a bit more torque than its ratings would indicate, > until the windings burn out. Since this one has a slightly > HIGHER current rating than the old one, it seems almost > impossible that it would have less torque than the old one. > So, if it bogs down, it seems like the VFD is not delivering > enough current to the motor. I'd suggest actually measuring > the current, but that could be quite difficult and a bit > dangerous. (You'd really have to use a current transformer.) Agree. Nicklas Karlsson ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://makebettercode.com/inteldaal-eval _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
