Jasondelane
Lifetime Supporting Member
I have a powerflex 753 22 amp drive running a 15 hp motor, powering a short conveyor. At a commanded speed of 60 hz the conveyor is running 1200 fpm. I'm having no trouble running the conveyor upwards of 105 hz. The problem occurs when I command a speed of around 110 hz, or 2200 fpm. The conveyor oscillated between 100-110 hz. It says accelerating on the HIM, and does not seem to be in current limit and does not overload. The motor is pulling right at 20-22 amps.
Changing from induction SV to V/HZ makes no difference.
Max speeds are all around 120 hz so it doesn't seem to be limited there.
Feedback is open loop and I've static tuned the motor.
It's almost as if there's a "phantom" load on the motor when I approach 2200 fpm.
Changing from induction SV to V/HZ makes no difference.
Max speeds are all around 120 hz so it doesn't seem to be limited there.
Feedback is open loop and I've static tuned the motor.
It's almost as if there's a "phantom" load on the motor when I approach 2200 fpm.