smartatuls
Member
Hi,
We have 3 Trolley crab on a over head crane. Each trolley has 2 motors connected to a Single drive(Drive is ATV71 Schneider make). The two motors of a crab are driving their respective wheels and are not mechanically coupled. On one motor we have Encoder which gives pulses to PLC(ATV IMC card) and using synchronization function block we are synchronising 2 trolleys and also 3 trolleys together.
The synchronization logic works well, I mean there is not much difference between the gap of adjacent trolleys if i check in PLC but physically there is difference between them which increases with every back and forth move. We are not able to control/reduce this distance.
First and third trolley motors are identical. Second trolley motor is little bigger as its trolley wheels are bigger than first and third trolley.
We tried changing parameters like Motor control type (Closed loop, open loop) Slip compensation but got no success .
Need help of your expertise.
We have 3 Trolley crab on a over head crane. Each trolley has 2 motors connected to a Single drive(Drive is ATV71 Schneider make). The two motors of a crab are driving their respective wheels and are not mechanically coupled. On one motor we have Encoder which gives pulses to PLC(ATV IMC card) and using synchronization function block we are synchronising 2 trolleys and also 3 trolleys together.
The synchronization logic works well, I mean there is not much difference between the gap of adjacent trolleys if i check in PLC but physically there is difference between them which increases with every back and forth move. We are not able to control/reduce this distance.
First and third trolley motors are identical. Second trolley motor is little bigger as its trolley wheels are bigger than first and third trolley.
We tried changing parameters like Motor control type (Closed loop, open loop) Slip compensation but got no success .
Need help of your expertise.