AC310 Frequency AC Drive used on Veneer Peeling Lathe in Vietnam

Project Overview

Site: A factory
Date: May 2022
Location: Vietnam
Industry: Machine Tool
Project scope: High performance vector control inverters used in woodworking industry
VEICHI deliveries: AC310 series AC Drive

Overview

The veneer peeling lathe solution raised by Veichi Electric has advantages of uniform thickness, smooth surface, small last veneer error and high timber utilization rate.

Working Principle of Veneer Peeling Lathe

The working principle diagram of veneer peeling lathe is shown as below. The log makes rotational motion under the co-driving of two fixed rollers and one moving roller to produce peeling power. The drive roller center support and the knife are relatively fixed and move together, in this way, the knife cuts out veneer from log. While the veneer thickness is controlled by the gap between the moving roller and the knife edge as well as the knife's moving speed. The gap between the moving roller and knife edge is relatively fixed and adjusted by the lathe equipment on basis of the veneer thickness. The control system adjusts the knife's speed by controlling motor's rotating speed, so the knife speed will indirectly determine the veneer thickness. Referring to the below diagram, the driving roller's rotating speed is constant, which means the log's constant linear velocity. The log's palstance will change with its diameter, in other words, the time a log required to spin a circle will follow the former change. In conclusion, the knife's moving speed is a variable value and a non-linear relationship. It's very important to design a system that can accurately control the knife's moving speed and achieve uniform veneer thickness. The basic ideas of system design is:
 (1) Establish accurate mathematical mode.
 (2) Take over the original speed control system to achieve accurate speed control.

Advantages of VEICHI AC310 for Veneer Peeling Lathe

1. The system that integrates the full digital control system and frequency inverter improves the response and eliminates the need for a PLC with large volume. It can greatly save costs by making the frequency inverter as the spindle drive power source and also the system control core.
2. The adopt of advanced algorithms and compensation methods can result in accurate, uniform and complete veneer thickness.
3. Using rotary encoder as the ranging sensor can increase the measurement accuracy to 0.01mm.
4. Using rotary encoder to measure the actual rotating speed of mobile platform can avoid the veneer thickness error caused by unstable grid voltage.
5. RS485 communication given will lead to less error.
6. Multiple choices of various sensor combination modes can meet customers' requirements to the most extent.
7. The system can continue to work without self-test in power failure situation, which brings great convenience.

Electrical Solutions

Wiring Diagram

Terminals of AC310
     

Power Supply Switch
   

Main Parameters and Debugging Procedures

F0.20=1
F2.10=0011
First----
F5.01=Number of motor poles
F5.02=Motor rated power
F5.03=Motor rated frequency
F5.04=Motor rated speed
F5.05=Motor rated voltage
F5.06=Motor rated current
F5.19=Extended PG pulse value
Second----F5.12=2
Then---Click the Keypad FWD button
When the in the FWD button is green Light is off, Auto study is finish.

HMI

wood ∮----wood Actual diameter
PeelFrqc----feed frequency
OCrrnt----output current
PeelThick----PeelThick
ActualDiameter----calibrate diameter
ResidualDiameter----remainder diameter
FastForwdFrqc----Fast forword frequency
FastRtrt----Fast backward frequency
AutoRtrt----Auto backward frequency
AutoStartPstn----Auto start position
RollerStartPstn---- Roller start position
MaxWood ∮----Max wood diameter
MinWood ∮----Min wood diameter
ForwardMode----Forward mode  0:roller and forward Simultaneous start
LeadScrewPitch----Lead screw pitch
Encoder----Encoder= (Actual Encoder*a) /b; a:PG frequency division   b=transmission ratio
TransmissionRatio---transmission ratio-----actual
FixedRollers∮----Fixed rollers diameter
FixedRllrCntrDist----Fixed rollers center distance
FixedRollerSpeed----rollers speed
PGFrequcyDivision----PG frequency division ≈ transmission ratio(rounding)
Other parameters is not important, so you can ignore them.