Control system works with real reel nip forces
A
Vishay Nobel product story
Edited by the Engineeringtalk editorial team
Mar 23, 2005
A new true digital servo force and positioning control reeling system can be used to adjust the primary arms' relief cylinders to the correct linear nip force on the winder of paper machines.
The Vishay Nobel RCS-microPOS is billed as a true digital servo force and positioning control reeling system that is used to adjust the primary arms' relief cylinders to the correct linear nip force on the winder of paper machines.
The system measures and controls the actual nip forces using specially designed load cells, rather than inferred forces from cylinder pressures, and control is true closed-loop.
Most types of paper machines that use a single drum winder can be retrofitted.
The microPOS is easily configured either at delivery from the factory or during commissioning.
Control during operation is carried out via the digital inputs on the RCS-microPOS from a PLC or directly from the operator's console.
The force set value is generated either internally in the module or comes from a master computer via Modbus.
The RCS-microPOS operates the cylinders with full control of position, speed, and acceleration.
When the cylinders approach the spool, their speed is automatically reduced and the switchover to force control takes place gently and under full control.
There is automatic weighing of the spool in the primary arms and amongst the other benefits of using this system is the fact that parallel transfer to force control minimises side shifting of the web.
Furthermore, the system calculates the primary arms' angles and adjusts the relief to the correct linear force.
Commissioning and service are carried out using a software program in a PC, which is connected to the RCS-microPOS via RS232.
All parameters for the configuration of the RCS-microPOS are arranged hierarchically and are easily accessible via the program.
The system setting of the parameters ensures easy installation and these settings can be saved to the PC disc and reloaded whenever necessary.
All data in the module are stored in EEPROM, which retains the data even during periods of power failure.
The system menu provides for the quick checking of the system status during operation and service.
Both traditional nozzle/flapper servo valves and direct-driven valves can be used with the microPOS electronics, built into a wall mounting enclosure as standard.
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