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Machine tool spindle debugging and cutting comparison test

2015-03-20

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1. System equipment and application instructions
Equipment: CNC lathe
Motor parameters: 5.5kW, 4 pole, 50Hz, 1460RPM, 11.6A (inverter motor)
Inverter model: V5-H-4T5.5G/7.5L-M0
Application note: The on-site spindle transmission ratio is 1:2.1, the spindle running 150RPM corresponds to the motor speed of 315RPM. At this time, the frequency of the inverter is 10HZ, the amount of the knife is 2.5MM for one side; the spindle running 200RPM corresponds to the frequency of 14HZ. The amount is unilateral 3MM operation is normal, the knife is changed to 3.5 when the car is driven; when the spindle is running 300RPM, the knife is unilateral 3.5MM is running normally, and the low frequency torque greatly exceeds a certain Korean L inverter. According to the on-site process requirements, the maximum spindle speed does not exceed 1600RPM. The test reaches 1680RPM. At this time, the frequency conversion frequency is about 120HZ, and the operation is normal. Two schemes, vector control 1 and vector control 2, were tested in the field. The results show that both schemes can meet the site requirements, and the effects are basically the same.
According to the customer's site requirements, the voltage adaptation range test is carried out. The voltage regulator is used for manual voltage regulation during the test. When the input voltage is 280V at no load, the operation is normal. When the voltage is reduced to 276V, an undervoltage alarm occurs. During the work test: the voltage drops to 286V, the spindle The speed is 300RPM, the knife is unilateral 2MM, and the operation is normal.
The customer originally used a certain L frequency converter in South Korea. The torque was not enough at low frequency, and there was a phenomenon such as brakes and jams. When the voltage was 20% lower, it could not be started.
The results prove that: 1. Our products have large low-frequency torque, far exceeding that of a certain L-brand inverter in Korea; 2. Our product has a wide range of voltage adaptation and fully meets the requirements of customers.

2. System wiring


news-Machine tool spindle debugging and cutting comparison test-VT Technologies-img


3. The function code setting
After confirming that the motor rotates in the correct direction, set the motor nameplate parameters P9.01~P9.04, and then perform the motor parameters static self-tuning. (Because the motor belt is inconvenient to disengage, it will be static self-tuning. After the setting is completed, it is necessary to manually modify P9.05 to reach about 40% of the rated current of the motor. If the field can be disconnected from the load, the motor rotation self-tuning effect will be better)
1) vector control 1: mode debugging parameters:
P0.03=0, control operation mode is vector control 1
P0.04=1, AI1 analog voltage reference frequency
P0.06=1, terminal given run command
P0.08=6 acceleration time 6S
P0.09=10, deceleration time 10S
P0.11=133, 133Hz corresponds to motor speed 3883 rpm (spindle 1850 rpm)
P0.13=133, frequency upper limit 133Hz
P3.09=0, allow reverse
P5.00=2, X1 terminal function is running forward
P5.01=3, X2 terminal function is reverse running
P9.01=4, motor pole number 4
P9.02=1460, motor rated speed 1460RPM
P9.03=5.5, motor rated power 5.5kW
P9.04=11.6, motor rated current 11.6A
PA.00=carrier frequency, according to on-site debugging
PA.05=180, vector control 1 current limit point 180%
PA.09=1, use energy brake
PA.11=680, braking voltage point
2) vector control 2 mode control debugging parameters:
P0.03=4, control operation mode is vector control 2
P0.04=1, AI1 analog voltage reference frequency
P0.06=1, terminal given run command
P0.08=6, acceleration time 6S
P0.09=10, deceleration time 10S
P0.11=133, 133Hz corresponds to motor speed 3883 rpm (spindle 1850 rpm)
P0.13=133, frequency upper limit 133Hz
P3.09=0, allow reverse
P5.00=2, X1 terminal function is running forward
P5.01=3, X2 terminal function is reverse running
P9.01=4, motor pole number 4 pole
P9.02=1460, motor rated speed 1460RPM
P9.03=5.5, motor rated power 5.5kW
P9.04=11.6, motor rated current 11.6A
P9.05=5.6, motor no-load current 5.6A
PA.00=carrier frequency, according to on-site debugging
PA.09=1, use energy brake
PA.11=680, braking voltage point
Pd.01=0.5, speed loop proportional gain 1
Pd.02=0.1, speed loop integration time 1
Pd.03=0.5, speed loop proportional gain 2
Pd.04=0.1, speed loop integration time 2
Pd.08=200, drive torque limit value
Pd.09=200, braking torque limit value

4. test machine data
Spindle 200-turn cutting test: (corresponding to inverter running frequency 14Hz)
Vector control 1 mode:
Workpiece diameter 120mm
Single side cutting 3mm, feed speed 150mm/min Good cutting and stable operation
Vector control 2 way:
Single side cutting 3.0mm good cutting
Spindle 300-turn cutting test: (corresponding to inverter running frequency 21Hz)
Vector control 1 mode:
Workpiece diameter 120mm
Single side cutting 3.5mm, feed speed 150mm/min Good cutting and stable operation
Vector control 2 way:
Single side cutting 3.5mm, feed speed 150mm/min Good cutting and stable operation



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