Application of Powtran Technology’s Variable Frequency Drive Control Cabinet on Electric Hoists
2020-08-03
I. Preface
An electric hoist is a specialized lifting device installed on overhead cranes and gantry cranes. It features a compact size, light weight, simple operation, and ease of use, making it suitable for applications in industrial and mining enterprises, warehouses, docks, and other similar environments. Each electric hoist is equipped with two motors—one for controlling the main hook and the other for controlling the trolley movement. Typically, two variable-frequency drives are used to independently control the start, stop, and speed adjustment of these motors.
II. On-site Configuration and Technical Requirements
(1) On-site configuration
10T electric hoist (main hook motor: 7.5 kW; trolley motors: 0.65 kW × 2).
Main Hook Motor Parameters
Small vehicle motor parameters
(2) Technical Requirements
Two frequency converters control the main hook and trolley motors respectively, featuring wireless communication capabilities and equipped with a touch screen.
III. Design Proposal
(1) Inverter Configuration
Main hook frequency converter model: PI500 011G3 (software specifically for lifting applications)
Inverter model for small vehicle: PI500 1R5G3
(2) Inverter control mode
The main hook inverter employs sensorless vector control, enabling excellent lifting performance even without an encoder. The trolley inverter uses V/f control (one-to-two configuration) and operates smoothly.
(3) Other configurations
Wireless communication module, touch screen, overload sensor, wireless remote control handle, and wired operation handle.
(4) System Control Chart
(5) Cabinet photo
(6) Wireless Communication Module Monitoring Interface
IV. Product Features
The Powtran Technology variable-frequency control cabinet features the following notable characteristics:
(1) Technologies such as reliable brake control, rapid stopping, DC excitation, and master-slave control. These technologies reduce the impact of the motor on the mechanical system during startup and shutdown, enhancing the smoothness and comfort of mechanical equipment operation. They also extend the service life of mechanical equipment, significantly improve production efficiency, and substantially reduce equipment maintenance costs.
(2) Equipped with wireless communication capabilities, it allows data monitoring via mobile phone or PC and enables remote locking and unlocking operations.
(3) The touchscreen allows for intuitive local observation and parameter setting.
V. Application Effects
A vector frequency converter is used to control the lifting operation of the electric hoist, providing ample lifting torque and ensuring stable performance, especially at high speeds. The hoist exhibits smooth horizontal movement and outstanding acceleration and deceleration performance during motion. Throughout the entire commissioning process, no faults such as overcurrent or overvoltage occurred, and the product’s performance has been fully recognized by both customers and equipment manufacturers.
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