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from Alpha Drives ltd...
The microprocessor controller and DC Drives were replaced wtih SIEMENS S7 1200 PLC combined with the Sinamic G120 Drive and KTP Touchscreen HMI.
One of the VSD’s was set up in a speed control loop to give precise speed control when unwinding the paper roll.
The second drive was set up in a standstill torque control configuration. This enables us to keep a constant tension on the paper feed regardless of the speed of the outfeed.
The touchscreen HMI offers increased diagnostics and allows more efficient fault finding.
The machine was put through a full test sequence during the commissioning phase which identified a number of electrical and mechanical issues which had previously gone unnoticed.
Once these issues were resolved the performance of the splicer was greatly improved.