Gantry cranes are a type of crane commonly used in shipyards, and INVT's Goodrive 350-19 inverter, which is customized for cranes, plays an insignificant role.
After the load test, after using the Goodrive 350-19 inverter, the functions and functions of the portal crane are qualified, especially the lifting and luffing control of the brake is very stable. Goodrive350-19 inverter is completely competent for the crane heavy load site, and has become the ambitious selection of portal crane with high function and high reliability.
Gantry crane composition:
The portal crane is composed of two parts: the mechanical part and the electrical system.
Electrical system composition:
The electrical system is mainly composed of human-machine interface, PLC, inverter, motor, brake, braking system, etc.
Requirements for frequency converters:
It can realize closed-loop control, with a large starting torque, usually exceeding 150% of the additional torque, if the overload test and other factors are considered, at least 200% of the additional torque should be supplied in the process of starting acceleration;
Because of the existence of the mechanical brake, in order to make the output torque of the inverter and the braking torque of the mechanical brake switch smoothly, and do not produce the phenomenon of slipping hook, it has the control sequence of the inverter starting signal and the mechanical brake action signal;
When the hook runs downward in the deceleration section, the motor will be in the state of regenerative power generation, and its energy will be fed back to the bus side of the inverter, and this part of the regenerated energy must be processed according to different site conditions;
When lifting the heavy object off the ground, the instantaneous load changes drastically, and the inverter should be able to carry out smooth control of this impact load;
Because of the requirements of production efficiency, portal cranes must have the ability to quickly start and stop to improve;
The portal crane is given to the PLC through the operation handle of the operation room and the man-machine interface, and the output is output to control the start and stop of the inverter (terminal command) and speed command (multi-section speed signal) after the PLC processing and calculation, and drives the motors of each executive organization to achieve speed regulation in different stages of operation.
The main hoisting, auxiliary hoisting, and luffing organization motors are driven by the corresponding Goodrive 350-19 series hoisting special inverter, and the special logic enabling of the holding brake is set, and the brake is opened and closed according to the special sequential logic operation of the portal crane, and the control of the holding brake logic is fused with torque verification, and the brake is loosened after the torque is established, so that the car does not slip safely;
The slewing organization has two sets of 22kW/380V motors, which are driven by one set of 55kW Goodrive 350-19 series hoisting inverter to drive the 1# slewing motor and the 2# slewing motor;
There are 8 sets of 4kW/380V motors in the walking organization, and 1 set of 55kW Goodrive 350-19 series hoisting special inverter drives the 1# travel motor to the 8# travel motor;
When the lifting organization is downward, slewing and walking organization inertial stopping, the energy generated by power generation is heated and dissipated through the external (DBU) or built-in braking unit and the external braking resistor.
Goodrive 350-19 series crane high-function special inverter in terms of overload ability, acceleration and deceleration time, torque, torque dynamic response speed, operating current, motor noise, speed stability accuracy, etc., the special brake logic, lifting heavy objects when running smoothly, safely, firmly and without slipping, can completely meet the requirements of various on-site use.
Detailed benefits
The system is stable and reliable, and the Goodrive 350-19 has excellent closed-loop vector control function, and has the ability to output zero speed and high torque.
The fast dynamic response of the inverter and the instantaneous torque output of up to 200% can effectively ensure that the crane does not produce the "slippery hook" phenomenon under the condition of zero speed maintenance;
The power section of the product is complete, and it is completely satisfied with the use of the main hoisting, auxiliary hoisting, luffing organization, slewing organization, walking organization and other executive organizations;
Functional macro parameters, simple debugging and complete functions;
The hoisting and luffing control of the brake is very smooth;
In addition to portal cranes, in the port lifting industry, INVT's products and solutions in port subdivisions such as shore power, tire cranes, rail cranes, straddle carriers, belt conveyors, and ship unloaders are constantly innovating. Today, INVT's performance in the use of port lifting career solutions has fully covered the domestic container and bulk terminals, and has established benchmark results in container terminals and bulk terminals in many overseas countries. In the future, INVT will provide more professional and meticulous and value-for-money products and services for lifting professional customers, so that customers will be more competitive.
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