VFAS3-4370PC AC Drive | 50 HP Toshiba

The Toshiba VFAS3-4370PC is a versatile high-performance AC drive from the AS3 series, delivering robust 50 HP motor control. Designed for 460V AC systems, it combines advanced control modes, integrated safety, and extensive connectivity in a compact A4 frame. This drive is engineered for demanding applications requiring precision and reliability.

Core Technical Specifications

• Brand & Model: Toshiba VFAS3-4370PC
• Series: AS3 Series High-Performance Drive
• Rated Power: 50 HP
• Supply Voltage: 3-Phase, 460 VAC Input & Output
• Current Rating: 74.5 A (Constant Torque), 88 A (Variable Torque)
• Frame Size: A4
• Enclosure: UL Type 1 / IP20 rated.

Advanced Control & Performance

• Control Modes: V/Hz, Sensorless Flux Vector Control (FOC), Encoderless/Encoder Torque Control.
• Frequency Range: 0.1 Hz to 590 Hz output.
• Carrier Frequency: Adjustable from 1 to 16 kHz for optimized motor sound and performance.
• Dynamic Braking: Integrated braking circuit (requires external resistor).
• Safe Torque Off (STO): Integrated safety function to prevent unintended motor start.

Communication & Connectivity

• Network Ports: (2) 10/100 Mbps Ethernet ports, (1) RS-485 port.
• Supported Protocols: EtherNet/IP, Modbus TCP, Modbus RTU, built-in web server.
• Expansion Slots: Optional cards for EtherCAT, encoder feedback, and additional I/O.

I/O & System Integration

• Analog Inputs: 3 channels (0-20 mA / 4-20 mA, ±10 VDC).
• Analog Outputs: 2 channels (0-20 mA, 0-10 VDC).
• Digital Inputs: 8 points, 24 VDC sinking/sourcing.
• Digital Outputs: 3 relay outputs (1 Form C, 2 Form A).
• Integrated Features: Built-in DC reactor and EMC filter for improved performance and compliance.

Physical & Environmental Data

• Operating Temperature: -15°C to +50°C (5°F to 122°F).
• Mounting: Panel or wall mount.
• Motor Compatibility: 3-phase induction and permanent magnet AC motors.
• Certifications: UL Listed, CSA, CE, RoHS compliant.

Frequently Asked Questions (FAQ)

What applications is this 50 HP drive best suited for?

It is ideal for applications like conveyors, mixers, pumps, fans, and machine tools that require precise speed control, high starting torque, or complex process integration.

What is the main advantage of the higher 16 kHz carrier frequency?

A higher carrier frequency allows for quieter motor operation (reduced audible whine) and can improve the performance of Flux Vector Control, especially at low speeds.

Does the integrated dynamic braking include a resistor?

No, the drive has the built-in braking circuit (chopper), but you must supply and connect an external braking resistor matched to your application's braking power requirements.

Can I network multiple drives together?

Yes, using the built-in Ethernet (EtherNet/IP or Modbus TCP) or RS-485 (Modbus RTU) ports, you can easily integrate multiple drives into a centralized control system.

What is required for Safe Torque Off (STO) implementation?

The STO function requires a safety-rated input circuit (e.g., from a safety relay or controller) connected to the designated terminals. Always follow applicable safety standards and guidelines during installation and validation.