MartB
Lifetime Supporting Member
This landed in my inbox this morning and I'm told it's a primer for an upcoming project that I will be providing programming for, so I thought I'd share this information with you and see if anyone has done anything like this before (I hate to re-invent the wheel).
"Empty pallet (single) transfer cart mounted on 50 foot long rail.
Cart position to be controlled by ILR Distance sensor utilising 4-20 mA output. This is to ensure cart knows it's position at all times even in the event of power loss or e-stop.
3HP SEW Eurodrive gear brakemotor (Inverter Motor).
At 60Hz the motor will travel 350fpm. The cart is designed for dynamic braking only. The brake will only be used to hold position during pallet transfer.
Cart movement to be designed with ramp up/ramp down curve.
There is no doubt that e-stop will loose the load, this is not an issue.
Short movement is not expected to reach full speed.
Inverter can be controlled like a closed loop vector.
Laser will be mounted off cart with reflector mounted on cart."
My first reaction is that I need better feedback, but never having worked with a laser distance sensor before I may be wrong.
I am also a little concerned that the customer says that the inverter can be controlled "like" a closed loop vector??
Looking at a preliminary layout it looks like the cart will stop at 13 positions (all fixed) and minimum distance between them being 2 feet, although obviously some are from one end of the rail to the other.
I would appreciate any ideas, thoughts or suggestions you guys may have.
Mart B
"Empty pallet (single) transfer cart mounted on 50 foot long rail.
Cart position to be controlled by ILR Distance sensor utilising 4-20 mA output. This is to ensure cart knows it's position at all times even in the event of power loss or e-stop.
3HP SEW Eurodrive gear brakemotor (Inverter Motor).
At 60Hz the motor will travel 350fpm. The cart is designed for dynamic braking only. The brake will only be used to hold position during pallet transfer.
Cart movement to be designed with ramp up/ramp down curve.
There is no doubt that e-stop will loose the load, this is not an issue.
Short movement is not expected to reach full speed.
Inverter can be controlled like a closed loop vector.
Laser will be mounted off cart with reflector mounted on cart."
My first reaction is that I need better feedback, but never having worked with a laser distance sensor before I may be wrong.
I am also a little concerned that the customer says that the inverter can be controlled "like" a closed loop vector??
Looking at a preliminary layout it looks like the cart will stop at 13 positions (all fixed) and minimum distance between them being 2 feet, although obviously some are from one end of the rail to the other.
I would appreciate any ideas, thoughts or suggestions you guys may have.
Mart B