Ken Moore
Lifetime Supporting Member
Old equipment, trying to run faster than designed.
I have a client that is still running a PLC5/40 on an extruder line. They are using a 10ms STI to read encoder values BTR and send speed to a drive via a BTW to a local AO card ( not remote IO). The drive powers a "puller" that runs about 10% above the extruder speed. So as the extruder ram changes speeds, the puller has to match.
They have slowly over the years increased line speed by about 50%. Now randomly, a new Siemens S120 drive will fault with "encoder" fault. I suspect the old resolver encoder they have on the motor is the issue, but just wanted to brain storm a bit.
The folks who installed the new drive say it's a plc problem, but supposedly all the problems started with the new drive. No proof of this.
If they slow down the line by about 10%, almost no issues.
Just for my own knowledge, does anyone know how fast a 1771-OFE1 and 1771-IFE can process at?
I have a client that is still running a PLC5/40 on an extruder line. They are using a 10ms STI to read encoder values BTR and send speed to a drive via a BTW to a local AO card ( not remote IO). The drive powers a "puller" that runs about 10% above the extruder speed. So as the extruder ram changes speeds, the puller has to match.
They have slowly over the years increased line speed by about 50%. Now randomly, a new Siemens S120 drive will fault with "encoder" fault. I suspect the old resolver encoder they have on the motor is the issue, but just wanted to brain storm a bit.
The folks who installed the new drive say it's a plc problem, but supposedly all the problems started with the new drive. No proof of this.
If they slow down the line by about 10%, almost no issues.
Just for my own knowledge, does anyone know how fast a 1771-OFE1 and 1771-IFE can process at?