I have a PowerFlex 40 drive that communicates with a 1756-L61 PLC via an 22-COMM-E card. There's an auxiliary contactor attached to the motor disconnect that interrupts the input to terminal 1 on the drive for the Stop when the disconnect is off. P036 and P038 are set to Comm Port. The VFD is being controlled by an AOI that I'm honestly not quite following along with. Or at least don't quite understand how the drive inputs and outputs interface with the logic. But there's a .Iterlocked_By bit that eventually turns on the Drive_Start bit in the AOI that won't allow the motor to run unless it's high.
On this conveyor that the drive runs, there's a labeler with a verification camera that checks a barcode. If the wrong barcode is read 5 times, there's a fault bit in the logic leading to the interlock output that drops out. I did some testing yesterday and if the interlock output goes high again within 30 seconds, the motor will start up automatically. If the interlock output stays low for more than 30 seconds, I have to turn the disconnect off at the motor, interrupting the stop input to the drive, turn it back on and then the motor runs again. I tested this a dozen times and anything under 30 seconds starts right back up.
The VFD is tagged PF40_5M0. I've noticed that when this happens, PF40_50M0:I.Ready drops out and when I turn the motor disconnect off and back on, it goes high again. I'm just not understanding what the relation is to the Stop input or why there's a 30 second threshold. I'm sure it's something simple I'm missing. I'm much better with logic than I am electrical. This is happening on multiple drives in the same area but from what I can tell, we have a handful of overhead conveyors with the same drive that no one has to go up with a lift to cycle the motor disconnects off and back on to get the motors to run if the line backs up and the conveyors stop. However, the drive parameters look the same.
Hopefully that all makes sense. Any help would be appreciated.
Thanks,
Jason
On this conveyor that the drive runs, there's a labeler with a verification camera that checks a barcode. If the wrong barcode is read 5 times, there's a fault bit in the logic leading to the interlock output that drops out. I did some testing yesterday and if the interlock output goes high again within 30 seconds, the motor will start up automatically. If the interlock output stays low for more than 30 seconds, I have to turn the disconnect off at the motor, interrupting the stop input to the drive, turn it back on and then the motor runs again. I tested this a dozen times and anything under 30 seconds starts right back up.
The VFD is tagged PF40_5M0. I've noticed that when this happens, PF40_50M0:I.Ready drops out and when I turn the motor disconnect off and back on, it goes high again. I'm just not understanding what the relation is to the Stop input or why there's a 30 second threshold. I'm sure it's something simple I'm missing. I'm much better with logic than I am electrical. This is happening on multiple drives in the same area but from what I can tell, we have a handful of overhead conveyors with the same drive that no one has to go up with a lift to cycle the motor disconnects off and back on to get the motors to run if the line backs up and the conveyors stop. However, the drive parameters look the same.
Hopefully that all makes sense. Any help would be appreciated.
Thanks,
Jason