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1. The site conditions
 Inverter model: V5-H-4T-2.2G/3.7L
Motor nameplate: 380V, 2.2kw, 4 pole, 5A, 1420r/min
Application: Hydraulic automatic lathe, the inverter is used to drive the spindle of the lathe. The machining of the workpiece is divided into 5 steps: clamping, high-speed drilling, low-speed grinding, trimming, and loosening of the spindle. The speed of drilling, grinding and trimming is given by the multi-stage frequency of the inverter.

2. The debugging parameters
Non-factory parameters: P0.03=4, P0.06=1, P0.08=P0.09=0.8, P0.11=P0.13=100, P4.22=40, P4.23=25, P4. 24=80, P5.00=2, P5.01=03, P5.02=09, P5.03=10, P5.04=11, P9.02=1420, P9.03=2.2, P9.04= 5, P9.05=2.9, P9.06=2.570, P9.07=13.6, P9.08=1.883, P9.09=213.7, P9.10=80.45, P9.11=68.96, P9.12=59.11, P9.13=57.47, P9.14=48.27.

3. The lathe debugging problem handling
When I started using it, the machine took more than a week. Although the frequency conversion didn't report the fault, but the product was not qualified, I started to do 100 workpieces only occasionally. Now there are several defective products in 10, they say that machinery All aspects have been checked, and it is suspected that it is a problem of frequency conversion. The user guesses that the torque of our frequency conversion is unstable, resulting in some workpieces that are not ground or worn over during low-speed grinding operations, which makes the product unqualified, mainly for tooth movement. There are problems, and the other processes are normal.

Processing steps:
◆ View the fault record d0.00~d0.02=0, there is no fault record, check the parameter control mode P0.03=0 for vector 1 control and P0.16=0 for automatic torque boost, according to the user's reflected torque instability Therefore, P0.16=4 manual torque boost, tried several workpieces or there is a problem in the grinding action, P0.16 added to 8 is still invalid, it should not be the cause of torque boost.
◆ View P9 group parameters. The motor parameters made by the agent when debugging are rotating self-learning, but the control mode is vector 1, which may result in the output effect is not very good, so change P0.03 to 4 vector 2 control, and modify the speed loop. The result of the parameter is still not good. The state of the observed current is very stable. There is no factor of instability. It is suspected that the motor parameters are not correct. So take off the belt of the motor and re-learn the motor parameters once. A few artifacts still appear defective. The on-site engineer suggested replacing a variable frequency test, replacing the inverter and adjusting the parameters after the test machine. The effect is basically not improved, but the defective products will still appear in the 10 workpieces, and the current and voltage frequency display are normal. It can be seen that the frequency conversion itself is No problem.
◆ It can be seen that it is certainly not caused by unstable torque of the inverter. The engineers and equipment manufacturers at the site also communicated, reflecting the possible reasons for this kind of site. The understanding of the equipment manufacturer is that the molar motion is switched to the reverse retraction. When the response is not timely, the acceleration/deceleration time is reduced, but the fault is skipped during acceleration and deceleration. Finally, the speed of the grinding tooth is reduced from the original 25hz to 15hz, and there is no defective product.

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