INVT GD300-EP VFD for Crawler Mobile Crusher Application

Crusher is the main equipment of mining, used to process the mined ore to complete the process of large blocks into small blocks. The covered mobile crushing plant is a kind of equipment integrating crushing and screening developed in recent years, which can crush the ore on site and move with the advancement of the raw material mining.

The crawler mobile crusher has the characteristics of easy installation, flexible mobility, and can save a lot of infrastructure and relocation costs. Its crawler travelling power is provided by the equipment's own generator-driven hydraulic device, while other crushing, screening, transport mechanism power is provided by multiple asynchronous motors external power supply.

At present, crawler mobile crusher has been widely used in stone quarrying, mining, chemical, building materials and other industries.

Client Needs: Lower Costs

The crawler mobile crusher produced by a company has many asynchronous motors, of which the largest power is 315KW.

Most of the mines in the field are powered by generators, if the motor is started directly, the inrush current is 5-7 times of the rated, and the generator capacity should be very large.If the motor starting current can be reduced, the generator capacity can be reduced, thus saving equipment investment and maintenance costs and improving customer competitiveness.Thus INVT provided customers with the GD300-EP series of special VFDs, and the problems were solved.

GD300-EP is a special product developed by INVT for shore power supply, EPS emergency system, fire emergency power supply, soft start motor, industrial frequency switching, voltage stabilization and frequency stabilization power supply, etc., which has the function of mains synchronous phase-locked control, real-time monitoring of input voltage and adjustment of output voltage, phase and amplitude consistent with the power grid.

INVT GD300-EP Solution

When the main motor of the mobile crushing plant is working normally, the 50HZ operation does not need to reduce the frequency, so the frequency conversion start is used to slowly accelerate the motor to 50HZ, and then switch to the industrial frequency operation.

The equipment is generally released after starting, and the frequency conversion is basically no-load when starting. In order to save investment costs, the power of the VFD can be half of the motor power, the motor is 315KW, and the VFD is 160KW.

In order to improve the starting effect, frequency conversion control mains synchronous phase-locked, for non-disturbance switching, to maintain the frequency converter cut the instantaneous current of the industrial frequency smooth and shock-free.

Control Block Diagram

INVT Solution Advantages

* By frequency conversion starting to industrial frequency, the starting current is controlled below the rated current of the motor, and there is basically no impact on the generator.
* The motor speed rises slowly without mechanical impact, which prolongs the service life of the equipment and reduces maintenance costs.
* Adopting advanced non-disturbance switching technology, the VFD runs to 50HZ and then automatically switches to industrial frequency, with smooth switching and high degree of automation.
* VFD built-in overcurrent, overheating, overvoltage, phase failure and dozens of other types of protection can be on the VFD itself and equipment protection.
* Adopting small power VFD to drive high power motor, saving investment cost and improving customer competitiveness.

Actual Effect Client Value

In actual use, connected to the 315kW motor test, frequency conversion to industrial frequency parameter waveforms are as follows:

It can be seen that INVT GD300-EP series special VFD, stable operation, reliable switching, simple operation and economic investment. When starting, the motor current is controlled below the rating, which fully adapts to the use environment and various requirements of the crawler mobile crusher, and produces good economic benefits.