Application of Frequency Converter in Modification of Single-arm Planer
Foreword
The B1012 type single-armed planer has been used for more than 30 years. The worktable transmission system uses a DC motor-generator set, which has a high failure rate and very high energy consumption. The inverter-controlled motor system has the advantages of significant energy-saving effect, convenient adjustment and control, and simple maintenance. Therefore, a general-purpose inverter is used to transform this machine tool.
1 Basic situation of B1012A type single-armed planer before transformation
The main components of the single-armed planer include bed, table, column, beam, table transmission, feed box, lubrication system, hydraulic safety device and electrical equipment. The worktable transmission system adopts a combination of a DC generator set and a second gear to perform the operations of deceleration, reversal, and slow-cutting of the workbench, belonging to the main drive system. Beam clamping and lifting and the movement and rotation of the tool holder belong to the auxiliary drive system. Workbench movement automatic cycle control uses a combined proximity switch.
2 One-arm planer control requirements
a. Stepless speed regulation and wide range of speed regulation, system running smoothly;
b. It can freely adjust the working speed according to different workpieces, and the speed of forward and backward can be adjusted independently;
c. Good starting and braking performance;
d. The system is simple, safe and reliable, easy to maintain, low noise, high efficiency and obvious energy saving.
3 Workbench main drive system transformation
3.1 Selection of Motor, Inverter and External Parts The main drive system of the workbench adopts a Y225M-6 and 37 kW asynchronous motor, and the frequency converter adopts FRN45G11S-4CX inverter manufactured by Fuji Electric. (Considering the working characteristics of the single-arm planer machine, the selected inverter is one step larger than the specification of the motor.) Since the main motor driven by the inverter generates a large amount of feedback energy during rapid commutation braking, The reversing brake of the planer adopts the deceleration brake and the external braking resistor unit (the braking resistor of the inverter is put into operation, this part of energy can be consumed through the way of resistance heating). In order to improve the braking ability of the inverter during deceleration, the braking effect is better.
3.2 Inverter external wiring diagram (see the figure below)
3.3 Adjustment of Inverter Function Parameters In order to make the inverter meet the requirements of load and operation mode, the following parameters must be set for the main parameters of the inverter.
3.3.1 Frequency Setting F01 is the frequency setting function. During the debugging, you can select 0 keypad key to adjust the machine parameters. 1 voltage input can be selected during operation (terminal [12] 0-10 V setting). Specific can be set according to the operating speed requirements.
3.3.2 Operation Operation F02 is a running operation command. Select 1 as the input and run the command from external terminals [FWD] and [REV].
3.3.3 Acceleration/deceleration time The F07 acceleration time and F08 deceleration time are all set to 1.8 s (depending on the actual use effect).
3.3.4 Torque Boost F09 Torque Boost, taking into account that the motor is usually working at low speed, so F09 should be set to about 10, that is, constant torque characteristics. However, it should be noted that when the torque boost increases, overexcitation occurs in the low speed area. When continuously operating in this state, the motor may overheat and the characteristics of the drive motor should be checked.
3.3.5 Frequency limitation Considering the use of a universal motor, the F15 upper frequency should be set to 50 Hz.
3.3.6 Motor parameter setting P01 motor pole number is set to 6 poles, P02 motor capacity is set to 37 kW, P03 motor rated current is set to 71A, P04 sets motor self-tuning selection P04=2 (requires to disengage load Setting).
4 Conclusion
After the inverter is used to transform the main drive system of the B1012A single-planer workbench to a DC motor-generator set, after operation, it fully meets the requirements of the production process, reduces energy consumption, improves production efficiency, and facilitates adjustment and maintenance. Obvious reduction.