Application of VEICHI AC70 in Floor Grinding Machine

Date: 2018-06-18 Location: Shanghai Product Model: AC70 Category: Construction Industry

Ⅰ. Product Overview

Floor grinding machine is mainly used for the ground grinding treatment, which can effectively polish terrazzo, concrete surface, epoxy cement mortar and the old epoxy floor, featuring functions of portability, flexibility and high working efficiency.

floor grinder

Ⅱ. Structure

1. Handle and regulator
2. The dry grinder is equipped with external connections for dry grinding and dust removing as well as the protective cover; the water grinder is equipped with water supply system.
3. Grinding disc and sheet: it has direct contact with the construction surface for grinding and the grinding sheets can be changed according to different construction surfaces.
4. Counterweight iron: according to the grinding strength of the construction ground, it's used to add and subtract weights.

Ⅲ. frequency inverter Wiring

Motors and inverters are generally configured with 1:1, such as the three-phase 380V 15KW motor with 15KW inverter. For higher grinding strength and overload capacity, a higher configuration is needed. The general power input is three-phase AC 380V.
Wiring diagram:

floor grinding machine inverter wiring.png

Ⅳ. Application Cases

A company in Jiading Shanghai adopts VEICHI AC70-T3-015G/018P frequency inverter to match their floor grinding machine with 15KW motor, which can normally work at 1000r/min. The machine can normally operate with 100um grinding sheets; if changed to 30um, the machine will alarm OL2 fault in 5Hz, while the fault has function of self-recovery. After lightening the load (counterweight iron), the floor grinding machine can go back to normal operation.

floor grinding machine frequency inverter

Client's requirements:
(1) When with 30um disc sheets, the machine won't alarm OL2 fault and can be started by single operator.
(2) To increase the loading capacity but turn down the under-voltage protection point.
(3) To realize fast stop by changing the stopping way.
(4) No need manual reset to the machine fault.

Parameter Setting: adjusting the related parameters (torque increase, stopping way, fault self-recovery, under-voltage protection and G/P model )

Function    code

Setting

Explanation

Function code

Setting

Explanation

E-00

1

V/F    control

E-34

1

Freely    stopping

E-01

1

Terminal    control

E-43

2

Twice fault self-recovery

E-02

2

VS1    voltage signal

E-44

2

2s    intervals before fault self-recovery

E-13

20

20S

E-55

60

60%    of the under-voltage bus protection value

E-18

8

Torque increased by 8%

E-61

1

P    model: 18.5KW

Attention: the value of E-18 needs to be reset after every modification of G/P model.

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