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One exact application of lathe with V&T EcoDriveCN® AC inverter drive speed controller (variable speed drives)

Photos on site of application cases of machine tools for precision control, including lathe

Site conditions

Model of V&T EcoDriveCN® vector control AC inverter drive speed controller: V5-H-4T-2.2G/3.7L

Motor nameplate: 380V, 2.2kw, 4 poles, 5A, 1420r/min

Applicable field: For hydraulic automatic lathes, AC inverter drive speed controller drives the spindles of lathe. There are five steps for machining workpieces, including clamping, high speed drilling, low speed milling, cutting, disengaging the spindle. Among these, the speed of drilling, milling and cutting is set by multi-step frequency of AC inverter drive speed controller.

Parameter Setting and Adjustment

Parameters setting (not default):
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...

Solution to the problems of lathe adjustment

From the beginning, the machine has run for one week. There's no failure error for AC inverter drive speed controller. But the finished products are unqualified. At the beginning, just several of 100 finished products are unqualified. Later several of 10 products are unqualified.

The engineers say they checked all the mechanical factors, but no problem. So they double the problem is caused by our AC inverter drive. The customers guess that the torque of our drive is not stable. Then the milling is not in place, or too much, in the action of low speed milling. This results in unquality of the products.

Now the main problem is, other steps of machining the work pieces are OK, except the action of milling.

The processing procedure

Check the failure records: d0.00~d0.02=0.

...

There's no record of failure. Check the control model: P0.03=0, vector control 1, and P0.16=0, it means automatic torque boost. Because the customers say the torque is not stable, we change it with P0.16=4 for manual torque boost.

...

Check the group of P9 parameters.

...

When the customers adjusted the inverter, it was rotating self-studying. But control model is vector control 1. This may cause the problem that the torque is not desirable. Thus we change P0.03=4: vector control 2, and change the parameters of speed loop. The problem is as before.

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The engineers on site communicate with the supplier (V&T Technologies Co., Ltd.), and discuss which factors may cause this result.

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So finally try to reduce the given speed of milling, from the original 25Hz to 15Hz. Finally there are no unqualified products now. Now the problem is solved!

We omit many information on the web page here. For details, just download this document: The exact application of lathe with V&T EcoDriveCN® AC drive speed controller.

Our inverter speed controllers are applied in the machine tool industry in the world, including lathe, drilling machine, CNC drilling machine, boring machine, cable making tool, chamfer machine, CNC boring machine, engraving machine, grinding machine, milling machine, shearing machine, die casting machine, drawing machine, high-speed drilling machine, multi-spindle drilling machine, electric discharge machine, laser engraving machine, etching machines, gear cutting machines, lapping machines, milling machines, planing machines and so on.