Vic,
Thank you for your correction.
No, I'm really not that dumb, and you dont have to be afraid to ride on my elevators.. utoh
I was thinking about the possability of an asymetrical operation of which I would have no experience with but have seen on some RVCs. I totally faild to mention what I was refering to in my last post. I am SWAGing as to why he is overshooting in the down only as I have little to no knowelge of the application being refered to.
HP= (LBS x FPM x (100-ocw))/ (33000 x EFF), so if he has no counterweight it would be figured for more HP.
Our Regen wattage calc for hoisting equipment is:
Watts = (Duty Cycle x LBS x FPM (100-OCW) x EFF)/ 44
Duty cycle = Lowering time/total cycle time
As far as I know, there are different regen watt requirements for hoisting applications, than in general machinery applications such as machine tools and horizontal conveyers etc. If his drive and motor are sized properly, it may be that the requirements for the regen resistors have been calculated for general machinery application and not hoisting applications thus providing a lower wattage & capacity to absorb the regen. Due to the difference in inertia between the up stop and down stop, this problem would most likely manifest it's self in the down direction in a more dramatic fashon.
In CT782's first post he faild to mention that he was dealing with a hoisting application.
To be honest, I dont have to do this often because my drive suppliers fully understand my application, (1 only) and supply all the components, (drive, motor, and regen bank etc..).
Ok Vic, did I talk my way out of it, or did I dig a deeper hole?
Mike