The very first instance of me using a VFD for hoisting was in 1997. I had used AB's 1336 Impact for the hoists. I had the motor decoupled from the gearbox and performed the rotational tuning. The hoist was rated for 75 Tons load. A load of 50 Tons was our test lift. The hoist lifted it well from the ground. once the hoist was stopped, despite having torque proving for the brakes, the motor would just not lift the load.
On reading the manual, it was then decided to run an Inertia Tuning with the load suspended mid air.
Once Inertia Tuning was done, we had no problem lifting even 90 Tons.
I have always carried out the same procedure with ABB, Yaskawa, Meidensha, and Delta drives. Haven't had any problems so far.
But, reading the Inertia Tuning section in Yaskawa's A1000 manual, got me questioning the validity of my previous projects.
On reading the manual, it was then decided to run an Inertia Tuning with the load suspended mid air.
Once Inertia Tuning was done, we had no problem lifting even 90 Tons.
I have always carried out the same procedure with ABB, Yaskawa, Meidensha, and Delta drives. Haven't had any problems so far.
But, reading the Inertia Tuning section in Yaskawa's A1000 manual, got me questioning the validity of my previous projects.