1. Industry overview

Bridge crane is a kind of bridge crane running on the elevated track, is a very widely used in industrial and mining enterprises a loading and unloading equipment, due to the poor working environment of the bridge crane, often need to frequently start, brake, positive and negative rotation, variable speed and other operations under heavy loads, large impact current, large vibration, so in the traditional electrical control system, The contactor contact is often burned out due to the impulse current of the motor, resulting in a large amount of maintenance and high maintenance costs, and the comprehensive technical indicators of the traditional crane speed regulation system are poor, which can not meet the requirements of industrial production. The equipment adopts FGI FD100 series special frequency converter for lifting, which has the advantages of high speed regulation performance, reliable operation and easy maintenance, providing a new electrical control scheme for the crane industry. The scheme has simple control line, stable operation and reduced maintenance, and has become the mainstream of the development of the crane industry.

2.Equipment introduction

Structural composition:

Bridge crane is a kind of equipment used to lift various objects over the fixed span. It is generally composed of four parts: lifting trolley, bridge metal structure, bridge operating mechanism (truck operating mechanism) and electrical control equipment. The lifting trolley consists of a lifting operating mechanism and a trolley operating mechanism. In the electrical control system, the power supply is generally transmitted to the central electrical device through the trolley conductive device (auxiliary sliding line), the crane total power conductive device (main sliding line) and other parts.

Working process:

The bridge crane can realize the vertical, transverse and longitudinal movement of heavy objects in the three-dimensional space, and the longitudinal and backward movement along the track on both sides of the workshop is driven by the trolley motor. The trolley and lifting mechanism are driven by the trolley motor to move laterally along the track of the bridge, and are driven by the lifting motor to move vertically up and down when lifting heavy objects.

3.System configuration

FGI FD100 series frequency converters are used in this site for large vehicles, small cars and lifting transmission systems. In the control system, the big car and the small car are controlled by a frequency converter, and the built-in anti-rolling and anti-rolling function, using a certain mathematical model, adjust the output frequency of the frequency converter, control the actual running speed of the mechanism, and achieve the purpose of inhibiting the swing of the main hook. The lifting mechanism is one to one control, in order to ensure the smooth transition between the start and stop of the crane during the lifting process, the electromagnetic lock timing must be set up to prevent the phenomenon of slipping, so the FGI FD100 series inverter has built-in lifting lock logic, while the detection frequency and current meet the setting conditions before the output lock signal. Ensure that the motor does not slip when starting and stopping, to meet the special needs of lifting.

4.Application advantage

FGI FD100 series inverter, support synchronous motor and asynchronous motor, built-in application macro function, parameter one-click setting;

Built-in special lifting lock logic, so that the equipment does not slip hook, hovering suspension does not alarm;

With anti-rolling function, it can eliminate the swing when the frequency conversion reaches steady state or stops;

Built-in zero servo function, in the closed loop vector control mode, when the load is detected and sliding automatically into the zero servo state, to ensure the safety of the equipment;

It can provide complete protection functions such as input phase loss, output phase loss, overcurrent, overvoltage, undervoltage, overload, etc. The overload capacity is 150% of the rated current 60S, ensuring the system is more stable and reliable, and won the trust of users.