Corporate News

Application of H7 AC drive in Octant positionof machine tool

Author:FOLINN 2022.03.30

H7 series AC drive is a new generation of ultra-high performance intelligent vector drive independently developed by our company based on the industrial application requirements of high stability, high performance and easy debugging. It is suitable for asynchronous motor, permanent magnet synchronous motor, synchronous reluctance motor, etc. The system has accurate speed regulation, large low-frequency torque and fast load response. It can realize various functions such as spindle positioning, rigid tapping, thread cutting, low-speed reaming and so on.This manual mainly introduces the composition of H7 spindle AC drive, the application of indexing and positioning on CNC lathe, debugging method, parameter setting and so on.


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The spindle is usually only used for speed control, but in some special cases, it is also necessary to control the position of the spindle. For example, the automatic tool change on the machining center, the tool transfer due to process requirements in boring, and the clamping of workpiece on the lathe at a specific position all require the spindle to stop at a specific position accurately, which is the spindle positioning function. That is, the CNC system sends a positioning command to the driver. The driver uses the Z signal on the spindle position encoder as the reference point to stop the spindle at a determined position and provide a certain torque.

H7 AC drive can realize indexing and positioning of multiple angles through digital input terminal or communication.


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H7 SERIES HIGH PERFORMANCE MOTOR DRIVER


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(1) closed loop self-learning

1.1 factory reset:P01.11=2   

1.2 set: P05.00=11(closed loop intelligent vector),

1.3 set: P02.18=Max. frequency;

P05.08=upper frequency;

P06.11=upper frequency;

P06.12=motor rated voltage;

P06.13=motor rated frequency;

P06.14=motor rated current;

P06.15=motor rated speed;

P06.17=number of motor poles;

P14.00=Encoder type (0: no; 1: ABZ; 2: rotary transformer, power off and power on again after setting);

P14.01=encoder resolution;

1.4 Motor self-learning: Set P06 00 = 1, press the "RUN" key on the keyboard, the motor starts complete self-learning, and the motor runs. After the motor stops, press the "STOP" key, the self-learning is completed.


(2)Set parameters

Parameter no.

Function

Setting value

description

P02.10

Setting value source 1

2

Analog value AI1 speed regulation

P02.50

Acceleration time 0

1.000s

Set according to site

P02.70

Deceleration time 0

1.000s

Set according to site

P03.00

Startup command source

7

S5 terminal forward

P03.01

Reverse startup command source

8

S6 terminal reverse

P03.30

Y1 terminal source (RA1, RB1)

4

Fault

P03.32

Y2 terminal souce (RA2, RB2)

16

Positioning complete

P07.00

Speed loop proportional gain

100%

Adjust positioning rigidity

P07.20

Current loop proportional gain

100%

Adjust positioning rigidity

P08.02

Position 1

0.000deg

Factory default

Set according site

P08.03

Position2

0.000deg

According to site settings

P08.04

Position3

0.000deg

According to site settings

P08.05

Position4

0.000deg

According to site settings

P08.06

Position5

0.000deg

According to site settings

P08.07

Position6

0.000deg

According to site settings

P08.08

Position7

0.000deg

According to site settings

P08.09

Position8

0.000deg

According to site settings

P08.15

Position start source

3

S1 terminal position

P08.19

Multi-stage position selection source

01110

S2, S3 and S4 terminal combination switching position

P08.29

Position source selection

1

Position 


Method of setting positioning position: when the driver is powered on and stopped, manually rotate the spindle to the position to be set, and then check the data of P10.82 (encoder angle), setting the data accordingly to P08.02~P08.09. Note: when multiple positions are fixed, P08.15 (position start source) needs to be enabled all the time.


(3)Octant position selection

S4

S3

S2

Positioning position

0

0

0

P08.02(Position 1) 

0

0

1

P08.03Positio2

0

1

0

P08.04Positio3

0

1

1

P08.05Positio4

1

0

0

P08.06Positio5

1

0

1

P08.07Positio6

1

1

0

P08.08Positio7

1

1

1

P08.09Positio8

0: stands for S terminal is disconnected; 1: stands for S terminal is closed


(4)system control

The system controls the forward rotation, reverse rotation, speed regulation, indexing and positioning of the driver after the above steps are completed.


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Positioning mode 1: the speed mode is switched to the spindle quasi stop control


The direction of positioning speed is consistent with the current running direction. If the zero point signal has been found, the spindle will follow the setting P02.70 deceleration time stops the spindle to the setting quasi stop position; If the zero point signal is not found, the spindle will continue to look for zero point according to P08.33 positioning speed .

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positioning mode 1


Positioning mode 2: switch from standby mode to spindle quasi stop control, also known as nearby positioning


In this case, the system will plan the spindle running trajectory in the nearest direction. The spindle will not move exceed one circle, and the spindle speed will not exceed the positioning speed. If the zero signal is not found, the spindle will continues to look for zero point according to  P08.33 positioning speed .

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Positioning mode 2 (nearby positioning)



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Site photos

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Site photos

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H7 series AC drive is based on the industry's top performance vector control. The open-loop control torque performance exceeds the industry's closed-loop control of applications that do not need positioning control. It provides position control function and is perfectly applied to the indexing and positioning application of machine tools. The built-in PLC function can greatly expand the scope of use, reduce the application cost, and quickly adapt to different application sites.



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Zhejiang New Folinn Electric Co., Ltd., referred to as Folinn Electric, was founded in 1994. It is located in Wenling, Zhejiang, a young city on the coastline of China and a famous advanced manufacturing base in the Yangtze River Delta. The company focuses on inverter manufacturing, and its market share has always been in the forefront of the industry. It is one of the few professional inverter manufacturers in China that integrates R & D, production and sales.

The company has 270 patented technologies and 21 software copyrights; the total construction area of its own workshop is 35,000 square meters. Three major R & D centers have been established in Taizhou, Hangzhou and Germany. The sales network and after-sales service agencies have been distributed in major provinces, cities and autonomous regions in the country, and are exported to Europe, America, Southeast Asia, the Middle East and other countries. After nearly 20 years of leaping development, it has been rated as the "Top Ten Domestic Low-Voltage Frequency Converter Brands" and "Zhejiang High-tech Enterprise" for many consecutive years.


Official website