BEST 1.5kW 220V VFD Inverter for CNC Spindle Small Case FC300-1.5G-S2-B3S

The BEST FC300-1.5G-S2-B3S is a compact Variable Frequency Drive designed for controlling compatible three-phase CNC spindle motors and AC motors from a single-phase 220V power supply. With a 1.5kW power rating and output frequency adjustable up to 1000Hz, it is particularly suitable for CNC routers, engraving machines, woodworking equipment, and high-speed spindle applications.

The B3S small-case design provides the functions of the FC300 series in a more compact enclosure, making it useful for CNC control boxes and machines where installation space is limited.

The VFD allows users to control spindle speed, start and stop operation, rotation direction, acceleration, deceleration, and operating frequency while providing important electrical protection functions for the drive and connected motor.

Key Features

• BEST FC300 Series VFD inverter

• Model FC300-1.5G-S2-B3S

• 1.5kW rated motor / spindle power

• Single-phase 220V AC input

• Three-phase 0–220V AC output

• 7A rated output current

• Adjustable output frequency from 0–1000Hz

• Compact B3S small-case design

Designed for CNC Spindle Control

The FC300-1.5G-S2-B3S is particularly suitable for controlling high-speed spindle motors used on CNC routers and engraving machines.

By varying the output frequency, the VFD allows the spindle speed to be adjusted according to the material, cutter, machining operation, and required finish.

It can be used for applications such as:

• Wood routing

• Acrylic machining

• Plastic engraving

• Aluminium light machining

• CNC carving

• Sign making

• PCB engraving

• General CNC milling

Single-Phase 220V Input to Three-Phase 220V Output

The inverter operates from a single-phase 220V AC supply and generates a variable-frequency three-phase output for a compatible 220V three-phase motor or spindle.

This makes it practical for CNC machines installed in workshops where standard single-phase 220V electricity is available but the spindle requires three-phase variable-frequency power.

The VFD output must only be connected to a compatible three-phase motor or spindle.

Wide 0–1000Hz Frequency Range

The FC300 Series supports output frequencies up to 1000Hz, allowing it to operate compatible high-frequency CNC spindle motors as well as conventional AC motor applications.

For example, many high-speed CNC spindles operate at frequencies such as 300Hz or 400Hz.

The maximum VFD frequency must always be set according to the connected spindle or motor nameplate. Never operate a spindle above its rated frequency or speed.

Adjustable Spindle Speed

The VFD allows output frequency and spindle speed to be controlled from the front control panel or through compatible external control signals.

Supported frequency control methods include:

• Digital keypad setting

• External 0–10V analog signal

• External 4–20mA current signal

• Compatible machine control inputs

This allows the VFD to be integrated into CNC machine control systems where automatic spindle start, stop, and speed control are required.

Programmable Acceleration and Deceleration

The FC300 allows acceleration and deceleration times to be configured according to the spindle and machine requirements.

Controlled acceleration helps reduce sudden mechanical and electrical stress during spindle startup, while controlled deceleration provides smoother stopping behavior.

These parameters should be configured correctly according to the connected spindle.

Forward and Reverse Control

Compatible motors can be operated in forward or reverse direction when the VFD is correctly configured.

This can be useful for selected industrial and machine applications, although most CNC routing operations normally use the spindle's standard forward cutting direction.

Always confirm spindle rotation before installing the cutting tool.

External CNC Controller Integration

The FC300 can be connected to compatible CNC controllers, breakout boards, PLCs, and other machine control systems.

Depending on the controller and wiring configuration, external functions can include:

• Spindle start

• Spindle stop

• Forward / reverse operation

• 0–10V speed control

• Multi-speed control

• External switches

• Automated machine control

Correct wiring and VFD parameter configuration are required for external control.

Built-In Protection Functions

The FC300 Series includes electrical protection functions to help protect the inverter and connected motor during abnormal operating conditions.

Protection functions include monitoring for conditions such as:

• Overcurrent

• Overvoltage

• Undervoltage

• Overload

• Overheating

• Output faults

• Abnormal motor operation

These protection functions do not replace proper grounding, circuit protection, wiring, and parameter setup.

Compact Small-Case Design

The B3S enclosure is the compact case version of the FC300 1.5kW inverter.

Its smaller form factor makes it suitable for:

• Compact CNC electrical cabinets

• Desktop CNC systems

• CNC router control boxes

• Machine upgrades

• Custom spindle installations

Adequate ventilation around the inverter must still be maintained for reliable cooling.

Technical Specifications

Applications

• CNC router spindle control

• CNC engraving machines

• Woodworking CNC machines

• Advertising CNC routers

• Milling and carving machines

• High-speed spindle motors

• Variable-speed machinery

• Automation equipment

• Custom CNC systems

• Machine upgrades

Compatibility

Suitable for compatible three-phase 220V spindle motors and AC motors within the VFD's 1.5kW, voltage, current, and frequency ratings.

Before installation, check the spindle or motor nameplate for:

• Rated voltage

• Rated power

• Rated current

• Rated frequency

• Maximum frequency

• Rated RPM

• Motor type

Important Installation Note

The VFD parameters must be configured according to the connected spindle or motor before operation.

For a CNC spindle, carefully set parameters such as:

• Rated motor voltage

• Rated motor current

• Base frequency

• Maximum frequency

• Minimum operating frequency

• Acceleration time

• Deceleration time

• Frequency control source

Incorrect settings can damage the spindle, motor, or inverter.

Do not connect or disconnect the spindle while the VFD is running, and do not connect mains power to the VFD output terminals.

Safety Note

This VFD operates with hazardous mains voltage. Installation, wiring, grounding, and commissioning should be performed by someone familiar with CNC and industrial electrical systems.

Disconnect mains power before wiring or servicing and allow sufficient time for the internal capacitors to discharge before touching the terminals.