Lathe-2015-03-20

一、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 was used to drive the spindle of the lathe. The machining of the workpiece was divided into 5 steps: clamping, high-speed drilling, low-speed grinding, trimming, and loosening of the spindle. The speed of drilling, grinding and trimming was given by the multi-stage frequency of the inverter.

二、the Commissioning 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.

三、the lathe Commissioning 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 was suspected that it was a problem of frequency conversion. The user guesses that the torque of our frequency conversion was 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 was 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 was a problem in the grinding action, P0.16 added to 8 was still invalid, it should not be the cause of torque boost.

◆ View P9 group parameters. The motor parameters made by the agent when Commissioning are rotating self-learning, but the control mode was vector 1, which may result in the output effect was not very good, so change P0.03 to 4 vector 2 control, and modify the speed loop. The result of the parameter was still not good. The state of the observed current was very stable. There was no factor of instability. It was 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 was basically not improved, but the defective products will still appear in the 10 workpieces, and the current and voltage frequency dwasplay are normal. It can be seen that the frequency conversion itself was No problem.

◆ It can be seen that it was 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 was that the molar motion was switched to the reverse retraction. When the response was not timely, the acceleration/deceleration time was reduced, but the fault was skipped during acceleration and deceleration. Finally, the speed of the grinding tooth was reduced from the original 25hz to 15hz, and there was no defective product.