Total_newbie
Member
OP
In answer to your questions:
Load on motor should be constant throughout entire decel.
If I lengthen ramp time down, with (braking) torque around (or below) 40% of drive max - then I get constant decel rate all the way down. It is only when I go above this level that I see two separate decel rates. Initial rate corresponds to what I am aiming for (say based on 75% of max torque), and then it switches (at some lower RPM) to lower decel rate.
I know that aiming for constant decel rate via torque control (rather than speed control) might seem a bit backwards - but that is way that initial app was set up (I assume because torque control can control more quickly than speed control. Maybe things are different on newer drives...)
And, I am not sure what you mean that I am not commanding a torque, but only changing limits. When I tell the drive to give me 50% (of max.) torque - shouldn't the drive be giving me that torque (whether it is getting power from regen system or from grid) one way or another?
Load on motor should be constant throughout entire decel.
If I lengthen ramp time down, with (braking) torque around (or below) 40% of drive max - then I get constant decel rate all the way down. It is only when I go above this level that I see two separate decel rates. Initial rate corresponds to what I am aiming for (say based on 75% of max torque), and then it switches (at some lower RPM) to lower decel rate.
I know that aiming for constant decel rate via torque control (rather than speed control) might seem a bit backwards - but that is way that initial app was set up (I assume because torque control can control more quickly than speed control. Maybe things are different on newer drives...)
And, I am not sure what you mean that I am not commanding a torque, but only changing limits. When I tell the drive to give me 50% (of max.) torque - shouldn't the drive be giving me that torque (whether it is getting power from regen system or from grid) one way or another?