Abstract: Veneer peeling machine is one of the main equipment for plywood production. It can be divided into two types: the one with wood clip and the one without wood clip. The one with wood clip is suitable for large diameter wood and the one without wood clip is used for small diameter wood. This paper mainly introduces the whole solution of the machine without wood clip with INVT PLC, HMI and vfd drives.
Keywords: INVT, GD200A, GD35 Veneer peeling
1.Application introduction
Veneer peeling machine without wood clip has rollers at both front and rear side, with the force from motors, the wood inside will be peeled layer by layer. It’s a high efficiency and high precision wood peeling equipment. The remaining waste diameter is less than 1cm, and the linear peeling speed can reach 150 meters per minute, and the thickness error of ±0.1mm, width error of ± 2mm.
Single motor roller veneer peeling machine:
Dual motor roller veneer peeling machine:
2.INVT solution
2.1 System configuration
For this veneer peeling machine, INVT PLC IVC1L and HMI VS070 are used for controller and display. PLC controls single/dual roller inverter and feeder inverter through 3 channels 50 kHz high speed pulse output, and communicates with HMI and cutter inverter through Modbus RS485.
The system diagram is as below:
The system configuration list:
| Name | Model No. | Qty | Remark |
| PLC | IVC1L2416MAT | 1 | Controller |
| HMI | VS070 | 1 | Setting and display |
| Roller shaft inverter | GD200A-030G/37P-4 | 1 | Roller |
| Rubber roller inverter | GD200A-015G-4 | 1 | Conveyor |
| Feeder roller inverter | GD200A-2R2G-4 | 1 | Feeder roller(with DBR) |
| Cutter inerter | GD35-2R2G-4-H1 | 1 | Cutter(with DBR) |
2.2 Electrical diagram
Control cabinet:
Site photo of veneer peeling machine:
2.3 Control process
When wood is loaded, the machine starts running, and the PLC and GD35 drive will detect signals and calculate quickly, and make sure the last sheet is a complete and qualified.
PLC is the head for signal detection and command distribution.
HMI is used for parameters setting and displaying.
Roller shaft holds the wood and makes it rotate.
Feeder roller steps forward according to the calculated curve, make sure even veneer thickness.
Rubber roller is used for transporting the wood sheets.
Cutter is used for cutting the wood sheet at length. The length can be set in HMI.
2.4 Parameters setting
2.4.1 Cutter inverter setting
| Function code | Name | Setting value |
| P00.00 | Speed control mode | 3 |
| P00.01 | Run command channel | 1 |
| P00.03 | Max. output frequency | 200 |
| P00.04 | Upper limit of the running frequency | 200 |
| P00.06 | A frequency command selection | 4 |
| P00.11 | ACC time1 | 0.5 |
| P00.12 | DEC time1 | 0.8 |
| P05.01 | S1 terminal function selection | 1 |
| P05.02 | S2 terminal function selection | 45 |
| P05.04 | S4 terminal function selection | 7 |
| P05.06 | S6 terminal function selection | 4 |
| P05.08 | S8 terminal function selection | 43 |
| P08.06 | Jog running frequency | 50 |
| P08.07 | Jog running ACC time | 0.6 |
| P08.08 | Jog running DEC time | 0.6 |
| P14.00 | Local communication address | 5 |
| P14.02 | Digital bit checkout | 0 |
| P20.00 | Encoder type | 0 |
| P20.01 | Encoder pulse number | 2500 |
| P21.28 | Torque feed forward gain | 40 |
| P23.00 | Cutter mode | 1 |
| P23.03 | Cutter diameter | 220 |
| P23.04 | Numerator of the cutter gearbox | 150 |
| P23.05 | Denominator of the cutter gearbox | 10 |
| P23.06 | Diameter of the material feeding roller | 120 |
| P23.07 | Pulses of the material feeder encoder | 600 |
| P23.11 | Cutting speed increase in the synchronization area | 14.6 |
| P23.16 | Unit of cutting length | 3 |
2.4.2 Roller shaft inverter/ Rubber roller inverter/ Feeder inverter setting
| Function code | Name | Roller shaft inverter setting value | Rubber roller inverter setting value | Feeder inverter setting value |
| P00.00 | Speed control mode | 2 | 2 | 2 |
| P00.01 | Run command channel | 1 | 1 | 1 |
| P00.03 | Max. output frequency | 200 | 200 | 200 |
| P00.04 | Upper limit of running frequency | 200 | 200 | 200 |
| P00.06 | A frequency command selection | 4 | 4 | 4 |
| P00.11 | ACC time1 | 0.5 | 0.5 | 0.5 |
| P00.12 | DEC time1 | 0.8 | 0.8 | 0.8 |
| P05.01 | S1 terminal function selection | 1 | 1 | 1 |
| P05.02 | S2 terminal function selection | 0 | 0 | 2 |
| P05.04 | S4 terminal function selection | 7 | 7 | 7 |
| P08.37 | Dynamic braking enable | 0 | 0 | 1 |
3.System advantages
High accuracy of wood radius calculation
Fast response of cutter inverter, high accuracy of veneer length
Fast response of feeder inverter, even veneer thickness
Speed adjustable, max speed 200m/min
Make sure the last sheet qualified, less wastage
Unattended, automatic operation.
4.Conclusion
INVT PLC, HMI and GD35/GD200A inverter solution is successfully used for veneer peeling machine which is the main equipment for plywood production. It improves the production efficiency and accuracy, and user friendly design, simplifies the maintenance. The INVT solution for veneer peeling machine has been widely introduced and applied all over China and makes our partners more competitive in the market.
Reference:
[1] GD200A Series general purpose vector control inverter instruction manual, Shenzhen INVT Electric Co., Ltd.
[2] GD35 Series close loop vector control inverter instruction manual, Shenzhen INVT Electric Co., Ltd.
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