Drive | AC Motor Control Equipment

Key Advantages

The Built-in PLC Function eliminates the hardware cost of external controllers. Combined with advanced Vector Frequency Control algorithms, it delivers smooth, high torque even under low-frequency, heavy-load conditions. It supports Modbus RTU Communication, allowing easy integration into existing factory networks for remote group control and data collection across multiple units. The system automatically executes Energy Saving Control based on real-time loads, maximizing power reduction while ensuring highly efficient production line operation.

Working Principle

After the main control cabinet issues an operation command, the rectifier circuit inside the Variable Frequency Drive first converts incoming AC power to DC. Then, under microprocessor control, the inverter circuit outputs a Pulse Width Modulation (PWM) waveform with adjustable frequency and voltage. Through Vector Frequency Control technology, the drive accurately decouples the motor's excitation current and torque current, achieving smooth speed regulation and high starting torque. Meanwhile, via the Modbus RTU Communication interface, the device feeds back real-time current, voltage, and fault status to the host computer. During operation, the system continuously monitors load changes and executes Energy Saving Control, keeping motor efficiency in the optimal range through dynamic voltage and frequency reduction.

Application Fields

1.HVAC: Variable speed control for central AC chilled water pumps and cooling tower fans.
2.Water treatment and plants: Constant pressure water supply and energy-saving upgrades for supply and sewage pumps.
3.Industrial manufacturing: Stepless speed control for production line conveyors, mixers, and extruders.
4.Mining and metallurgy: Soft start and heavy-load operation for large fans and ball mills.

FAQ

Q1: Will the drive overheat and crash in a harsh electrical cabinet with heavy dust and high temperatures?

A: The independent air duct design completely isolates the heat dissipation from the electronic components. Combined with smart temperature-controlled fans, it ensures long-term, stable operation of internal parts without derating or crashing, even in dusty and hot cabinets.

Q2: Will the harmonics generated by the drive interfere with PLCs and sensors on the same power grid?

A: A built-in DC reactor and EMI filter come standard. This effectively suppresses high-order harmonic pollution to the grid, prevents interference with nearby precision instruments, and easily passes stringent EMC tests.

Q3: When used for water pumps, how do you solve "water fighting" or resonance between two drives?

A: It supports multi-pump parallel control logic and sleep/wake functions. Through Modbus RTU Communication, it shares real-time water pressure data to automatically distribute frequencies between the main and auxiliary pumps, completely eliminating pipe network resonance and water fighting.

Technical Specifications