Kev77
Member
Hi,
I have a Compactlogix processor (L33ERM) that is going to sync two lugged convyors and I am looking for some suggestions on the instructions to keep them synced up.
I have a lugged chain that has 15 links between lugs and one revolution of the master axis is 1 lug spacing. The master is not a motion axis that I can control. Basically the master runs open loop at whatever the operator has the speed pot set to and turns the master encoder which is connected to the head shaft of the conveyor. The master encoder is an Ethernet/IP encoder that is configured to give me a position of 0-360 degrees. I could have set it up to be the length between lugs which is about 30".
The slave axis is a 5hp Powerflex 755 with an absolute encoder on the motor and is configured as a CIP motion drive. This axis is a lugged conveyor with 10 links between lugs. With the encoder mounted on the motor, I am working with some ratios between what the encoder sees and what one revolution of the slave is. The slave sprocket is 13 teeth and I need to incrament 10 to match the 15 of the master.
The overall ratio is about 56:1 but is not a round number so I think if I set up the ratios in the motion profile, I am going to accumulate error due to the trailing numbers of the ratio. So I thought to set up the slave to run 0-360 degrees to match the master and then either gear or use an absolute MAM (motion axis move) to issue the slave a target position then an MRP (motion redefine position) each update period to advance the position. The issue I have is the head shaft of the slave is a 13 tooth sprocket so I would need 276.923076923077 degrees of the slave to 360 degrees of master which might cause an issue.
I have most of the program set up as far as fault handling, status and homing of the master axis and have tested the system using jog commands as well as a geared move. The slave runs and tracks the master but I need to make sure they are always synced up.
My questions are:
1. What is the best way to set up the master and slave to ensure that they stay synced up? (Degrees, inches, simulated lug pulses?)
2. Would it be best to use a MAG (motion axis gear) to drive the slave and have it track the master?
3. Would using a MAM (motion axis move) and MRP (motion redefine position) work for gearing these two lugged conveyors?
4. Would a MDAC (master driven axis control) help if I use a MAM to run the slave? It appears that this will give me the ability to start and stop the slave on the fly.
I'm sure that I am over complicating this so I'm hoping someone has some insight on out to do this the correct way.
Thanks,
Kevin
I have a Compactlogix processor (L33ERM) that is going to sync two lugged convyors and I am looking for some suggestions on the instructions to keep them synced up.
I have a lugged chain that has 15 links between lugs and one revolution of the master axis is 1 lug spacing. The master is not a motion axis that I can control. Basically the master runs open loop at whatever the operator has the speed pot set to and turns the master encoder which is connected to the head shaft of the conveyor. The master encoder is an Ethernet/IP encoder that is configured to give me a position of 0-360 degrees. I could have set it up to be the length between lugs which is about 30".
The slave axis is a 5hp Powerflex 755 with an absolute encoder on the motor and is configured as a CIP motion drive. This axis is a lugged conveyor with 10 links between lugs. With the encoder mounted on the motor, I am working with some ratios between what the encoder sees and what one revolution of the slave is. The slave sprocket is 13 teeth and I need to incrament 10 to match the 15 of the master.
The overall ratio is about 56:1 but is not a round number so I think if I set up the ratios in the motion profile, I am going to accumulate error due to the trailing numbers of the ratio. So I thought to set up the slave to run 0-360 degrees to match the master and then either gear or use an absolute MAM (motion axis move) to issue the slave a target position then an MRP (motion redefine position) each update period to advance the position. The issue I have is the head shaft of the slave is a 13 tooth sprocket so I would need 276.923076923077 degrees of the slave to 360 degrees of master which might cause an issue.
I have most of the program set up as far as fault handling, status and homing of the master axis and have tested the system using jog commands as well as a geared move. The slave runs and tracks the master but I need to make sure they are always synced up.
My questions are:
1. What is the best way to set up the master and slave to ensure that they stay synced up? (Degrees, inches, simulated lug pulses?)
2. Would it be best to use a MAG (motion axis gear) to drive the slave and have it track the master?
3. Would using a MAM (motion axis move) and MRP (motion redefine position) work for gearing these two lugged conveyors?
4. Would a MDAC (master driven axis control) help if I use a MAM to run the slave? It appears that this will give me the ability to start and stop the slave on the fly.
I'm sure that I am over complicating this so I'm hoping someone has some insight on out to do this the correct way.
Thanks,
Kevin