User-Friendly Inverter Control Panel for Bridge Crane Systems with
Custom Design
The variable frequency control cabinet for overhead cranes is a
core component of modern crane electrical systems. It utilizes
variable frequency speed regulation technology to achieve precise,
efficient, and safe control of crane operations (trolley, trolley,
and hoist). Its key features are as follows:
1. Core Function: Variable Frequency Speed Regulation
Smooth Start/Stop: This replaces traditional starting methods using
series resistors or eddy current brakes. By varying the frequency
and voltage of the output power supply, it achieves stepless,
smooth acceleration from zero to the set speed, and smooth
deceleration from the set speed back to zero. This significantly
reduces mechanical shock and extends the life of the structure,
transmission mechanism, and wire rope.
Precise Speed Control: The operating speed can be precisely set and
adjusted across the full speed range (typically 0-100% of rated
speed, or even wider), meeting the requirements of precise
positioning and slow-speed hoisting. This particularly enables
extremely low, stable creeping speeds for hoisting mechanisms.
Multi-Speed Operation: Multiple fixed speed levels can be preset
and quickly switched via buttons on the control panel.
2. Hardware Components:
Core Component - Inverter: Typically, a high-performance
vector-controlled inverter (especially important for hoisting
mechanisms) or a V/F-controlled inverter (suitable for both
trolleys and cranes) is used. The power rating must match the power
of the driven motor and the load characteristics of the crane
(hoisting inverters must consider heavy load and overload
capabilities).
3. Input/Output Reactors:
Input Reactors: Suppress harmonic pollution from the inverter to
the grid, protecting the inverter from grid voltage fluctuations
and surges.
Output Reactors (DV/DT Reactors or Sine Wave Filters): Protect
motor insulation, reduce voltage spikes and electromagnetic
interference caused by high-frequency PWM pulses during long cable
transmission, and reduce motor noise and heat generation.
