dlmidget
Member
I have been beating my head against two tempos now for awhile.
The machine is a planer of which we are controlling the side head sizes with tempos /plc-5 QB modules and hyd cylinders ( one per head)
The right head has the tempo directly in the cylinder.
The left has the magnet mounted to the head and the tempo mounted to the right head.With its own cylinder.
Most of the time the system works ok.
However frequently one head or the other will oscillate around the setpoint sometimes more violently than others.(even with nothing but pump running) It is worse/better at different setpoints. Maybe due to piston surface area??
The reason the are coupled with the tempo is to provide head biasing where the operator only has to change one offset.Ie the left head will follow any offset added to the right head.
Past practice is to null the valve to calm the head. But at differnt setpoints nuliing is again required. This is a long lasting problem through different valves and tempos.
My questions are could this simply be a setup issue? As the QB/tempo should be able to maintain position even if the cylinder has drift RIGHT?
Is the PLC-5 fast enough to do what we are trying to do with the tempos coupled together or do we need a motion controller?
As you may have guessed Im no expert. We have been nulling the valve with signal. I thought you should null it at 0 signal but that leads to a greater oscillation.
Sorry for the long first post but I am befuddled and need the advice of someone with solid positioning experience.
The machine is a planer of which we are controlling the side head sizes with tempos /plc-5 QB modules and hyd cylinders ( one per head)
The right head has the tempo directly in the cylinder.
The left has the magnet mounted to the head and the tempo mounted to the right head.With its own cylinder.
Most of the time the system works ok.
However frequently one head or the other will oscillate around the setpoint sometimes more violently than others.(even with nothing but pump running) It is worse/better at different setpoints. Maybe due to piston surface area??
The reason the are coupled with the tempo is to provide head biasing where the operator only has to change one offset.Ie the left head will follow any offset added to the right head.
Past practice is to null the valve to calm the head. But at differnt setpoints nuliing is again required. This is a long lasting problem through different valves and tempos.
My questions are could this simply be a setup issue? As the QB/tempo should be able to maintain position even if the cylinder has drift RIGHT?
Is the PLC-5 fast enough to do what we are trying to do with the tempos coupled together or do we need a motion controller?
As you may have guessed Im no expert. We have been nulling the valve with signal. I thought you should null it at 0 signal but that leads to a greater oscillation.
Sorry for the long first post but I am befuddled and need the advice of someone with solid positioning experience.