Products

B503PRO

Suitable for applications requiring stable motor control, adjustable frequency output, reliable start/stop behavior and configurable I/O connections.

product details

Product Overview

B503PRO is a sensorless vector control controller designed for AC motor speed regulation and industrial drive applications. It combines SVC, V/F and torque control with flexible frequency sources, built-in PID, multi-step speed operation and broad protection functions.

The series is suitable for applications requiring stable motor control, adjustable frequency output, reliable start/stop behavior and configurable I/O connections.

Key Selling Points

Supports sensorless vector control, V/F control and torque control.
Output frequency range: 0Hz to 600Hz.
Built-in PID control and simple PLC multi-step speed control up to 16 steps.
Automatic voltage regulation helps keep output voltage stable when input voltage fluctuates.
Speed trace function starts a rotating motor smoothly.
Fault protection includes over-current, over-voltage, under-voltage, overheat, phase failure and overload.

Core Parameters

Item	Details
Input voltage	220V / 380V AC, +/-15%
Input frequency	47Hz to 63Hz
Output voltage	0V to rated input voltage
Output frequency	0Hz to 600Hz
Control modes	Sensorless Vector Control (SVC), V/F Control, Torque Control
Overload capacity	G type: 150% rated current for 60s, 180% for 3s; P type: 120% rated current for 60s, 135% for 3s
Starting torque	G type: 0.5Hz / 150% (SVC); P type: 0.5Hz / 100%
Speed regulation	1:100 (SVC), speed accuracy up to +/-0.5% of maximum speed
Carrier frequency	0.5kHz to 16.0kHz
Working environment	-10C to 40C; less than 95% RH without condensation; altitude below 1000m without derating

Model Coverage

Model / Voltage Class	Power Range	Notes
1AC 220V input	0.75kW to 2.2kW	3PH 0-220V output
3AC 220V input	0.75kW to 55kW	3PH 0-220V output
3AC 380V input	0.75kW to 220kW	3PH 0-380V output

Interface and Control

Seven programmable digital input terminals; DI5 supports high-speed pulse input up to 100kHz.
AI1 and AI2 support 0-10V voltage input or 4-20mA current input.
One programmable open collector output terminal (FM).
Two relay output terminals.
AO1 supports 0-20mA current output or 0-10V voltage output; AO2 supports 0-20mA current output.
Serial communication is available for system integration.

Application Scenarios

Industrial motor speed regulation.
Fan, pump and mechanical transmission systems requiring adjustable frequency control.
Systems requiring PID regulation, multi-step speed control or communication-based control.

Installation and Use Notes

Select the controller according to motor rated current and rated power.
Do not use the controller outside the specified voltage range.
Do not connect capacitors or voltage-sensitive devices to the controller output side.
Use proper grounding and keep control wiring away from strong-current wiring.

FAQs

What does a B503PRO controller do? ▶

It changes the speed of a suitable three-phase motor so connected equipment can match the job it needs to do. It can be used where motor speed, flow, or pressure needs control.

How do I choose a B503PRO model? ▶

Match the controller to the motor nameplate and the available power supply. The motor rating must stay within the selected controller’s stated output rating; have the final match checked before installation.

Can I use my existing pump motor with B503PRO? ▶

It is designed for ordinary three-phase motors. A motor must still match the controller rating, power supply, load, and installation; the controller does not make every household motor suitable.

Where is B503PRO operated? ▶

Basic operation is available from the controller keypad. External controls can also be set up where needed, so choose how the equipment will be started and controlled before the system is put into use.

Can B503PRO run preset speeds? ▶

Yes. You can use up to 16 preset speeds. This is useful when your equipment needs to switch between different speeds for different jobs.

Can an external device set the speed on B503PRO? ▶

Yes. A compatible machine control can send speed commands to B503PRO. Your installer can connect and set it up so the motor follows those commands.

What if the pump motor runs slowly for long periods? ▶

At low motor speed, motor cooling can be reduced. The installation should therefore consider the motor’s cooling needs and the expected operating range before continuous low-speed use.

What should I do if B503PRO shows a fault? ▶

Stop and note the displayed fault before restarting. Check the manual, motor, power supply, and connected equipment; if the cause is unclear, ask a trained service person to inspect the system.