Torque limit
Torque limit
(OP)
How does torque limit in a VFD? Is it reducing rms voltage?
Neil
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RE: Torque limit
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RE: Torque limit
In open loop operation, that is operation without any feedback from an encoder or tachometer, the drive is set and provides the current that is demanded by the motor. Drives normally will come with an "overload" comment of 125% or 150% OL for some time frame. That number is the amount of time the drive can provide the specified current without damage. Therefore the amount of torque you get out of the motor is a factor of the drives current limit. The other assumption is that you are not running the motor at so high a torque that is overheating or past the motors breakdown torque.
What JRAEF is describing is what I have come to know as a Vector Drive which is particularly useful in processes requiring tight speed and torque control.