TOSHIBA VFPS1 4220PL WP 22kW Inverter

The TOSHIBA VFPS1 4220PL WP is a 22 kW variable frequency drive from the VF-PS1 series, designed for three-phase induction motor control in industrial applications. Operating on a 400V AC power supply, this inverter is specifically engineered for pump, fan, and general-purpose applications, offering energy savings, reliable operation, and ease of configuration. The WP designation indicates a weather-protected or water-resistant variant suitable for demanding environments.

Product Overview

The VF-PS1 series from Toshiba represents a generation of compact, high-performance variable frequency drives that combine advanced control algorithms with user-friendly features. The VFPS1 4220PL model is rated for 22 kW continuous output power, making it suitable for medium-to-large industrial motors. The drive features sensorless vector control for high starting torque and excellent speed regulation, as well as V/f control for simpler applications. The VF-PS1 series incorporates Toshiba's proprietary motor control technology, which optimizes efficiency across the speed range. The drive's compact design reduces panel space requirements while maintaining easy access to terminals and configuration interfaces. The WP (weather-protected) version includes enhanced sealing and coating to resist moisture, dust, and corrosive atmospheres, making it suitable for outdoor installations or washdown environments. The drive is equipped with a built-in keypad for local operation and parameter configuration, with a clear LCD display showing operating status and fault information in plain text.

Technical Specifications

The VFPS1 4220PL operates on a three-phase 380-480V AC power supply with a tolerance of ±10%, at 50/60 Hz ±5%. The rated output power is 22 kW (30 HP) with an output current rating of 44 A continuous and 66 A for 60 seconds overload capacity. The output frequency range is 0 to 400 Hz, with 0.01 Hz resolution. The drive supports V/f control, sensorless vector control, and closed-loop vector control with optional encoder feedback card. The control method is selectable via parameters. The drive includes 6 digital inputs (24V DC), 2 digital outputs (relay, 250V AC/30V DC 2A), 2 analog inputs (0-10V or 4-20mA, 12-bit resolution), and 2 analog outputs (0-10V). The communication interface includes an RS-485 port supporting Modbus RTU protocol. Optional communication modules are available for Profibus DP, DeviceNet, Ethernet/IP, and CC-Link. The drive's efficiency is >97% at rated load, and the power factor is >0.95. The carrier frequency is adjustable from 2 to 15 kHz. The drive meets CE, UL, and cUL standards for global installation.

Pump and Fan Specific Features

The VF-PS1 series includes specialized features for pump and fan applications, which represent the primary use case for the 22kW model. The built-in PID controller accepts feedback from pressure, flow, or temperature sensors and adjusts motor speed to maintain the setpoint, eliminating the need for an external controller. The sleep function stops the motor when the required flow or pressure is below a user-defined threshold for a set period, saving energy and reducing wear. When demand increases, the drive automatically restarts. The pipe burst protection detects sudden pressure drops that could indicate a burst pipe and shuts down the pump to prevent flooding. The dry-run protection monitors motor current and power to detect loss of pump prime, stopping the motor to prevent seal damage. The drive includes a multi-pump control capability, allowing up to 4 drives to be configured for lead/lag operation, where additional pumps are started as demand increases. The automatic energy optimization function adjusts the output voltage to the minimum required for the current load, reducing motor losses and saving energy, particularly at partial loads.

Control Modes and Performance

The VFPS1 4220PL offers multiple control modes to match application requirements. V/f control is suitable for basic speed control where high starting torque is not required. Sensorless vector control provides 150% starting torque at 0.5 Hz and speed regulation of ±0.5% of base speed without an encoder, making it suitable for most industrial applications. Closed-loop vector control, enabled by an optional encoder feedback card, provides 0.01% speed regulation and full torque at zero speed for holding applications. The drive's autotuning function measures the connected motor's parameters automatically, optimizing performance without manual tuning. The drive includes a torque limit function that can be set independently for motoring and regenerative operation, protecting the driven machine from overload. The speed search function allows the drive to restart a spinning motor without tripping, useful for fan and pump applications where inertia may cause the motor to continue rotating after a power loss. The drive also features an electronic thermal overload relay with adjustable time constant to match motor characteristics, eliminating the need for external overload relays in many installations.

I/O and Communication Capabilities

The VFPS1 4220PL provides comprehensive I/O for integration with building management systems and PLCs. The 6 digital inputs are configurable for functions including run/stop, forward/reverse, fault reset, multi-speed selection (up to 16 speeds), PID enable, and sleep mode enable. The inputs accept 24V DC signals with programmable active high or low logic. The 2 relay outputs can be configured for drive ready, running, frequency arrival, fault, or PID deviation. The analog inputs can be configured as voltage (0-10V) or current (4-20mA) via jumpers. The analog outputs can be scaled to represent output frequency, output current, motor torque, or PID feedback. The RS-485 Modbus RTU port supports baud rates from 2400 to 115.2 kbps, with up to 31 drives on a single network. The drive supports both Modbus and Toshiba's proprietary ASD protocol. For integration with higher-level networks, optional communication modules are available that plug into the drive's expansion slot, providing seamless connectivity to Profibus DP, DeviceNet, Ethernet/IP, Modbus TCP, or CC-Link networks.

Protection Features and Reliability

The VFPS1 4220PL includes extensive protection features to ensure reliable operation and protect both the drive and motor. Overcurrent protection trips within 0.1 seconds when output current exceeds 200% of rated current. Overvoltage protection activates when DC bus voltage exceeds 820 VDC for 400V class drives. Undervoltage protection triggers when input voltage drops below approximately 320 VAC. Overload protection uses an electronic thermal overload model with adjustable time constant from 0.5 to 5 minutes. Over temperature protection uses a thermistor on the heatsink and an internal temperature sensor to detect excessive heat, with the drive reducing carrier frequency or tripping as needed. Short circuit protection on output terminals and ground fault protection are standard. Phase loss protection monitors input and output phases and trips if any phase is missing. The drive includes a built-in braking transistor for connection of an external regenerative resistor, allowing rapid deceleration of high-inertia loads. The drive's power components are rated for 100,000 hours MTBF, and the internal cooling fan has a lifetime of 40,000 hours. The WP version includes conformal coating on circuit boards and sealed connectors for protection against moisture and contaminants.

Applications

The 22kW VFPS1 4220PL is suitable for a wide range of industrial and commercial applications. Primary applications include water supply pumps in municipal or building systems where variable speed maintains constant pressure while saving energy; wastewater treatment pumps where flow control is required; HVAC fans and pumps in commercial buildings, where the drive interfaces with building automation systems; industrial fans for dust collection or ventilation; cooling tower fans where speed is adjusted to maintain water temperature; and small to medium industrial machinery such as mixers, crushers, and conveyors. The drive's weather-protected (WP) construction makes it suitable for outdoor installations such as irrigation pumps, booster stations, and rooftop HVAC equipment. The drive's energy-saving features make it particularly attractive for applications that operate continuously at varying loads, where significant electricity cost reductions are possible compared to fixed-speed operation with throttling valves or dampers.

Installation and Environmental Specifications

The VFPS1 4220PL should be mounted vertically on a non-flammable surface within a control cabinet, or for the WP version, directly on a wall or equipment frame in a sheltered outdoor location. Minimum clearances of 150 mm above and below and 50 mm on the sides are required for proper cooling airflow. The operating temperature range is -10°C to +50°C for standard version, with derating above 40°C. The WP version is rated for -10°C to +40°C. The humidity range is 20% to 90% non-condensing. The altitude limit for full rating is 1000 meters, with derating of 1% per 100 meters up to 4000 meters. The drive's IP20 rating for the standard version requires installation in a cabinet. The WP version is rated IP54 or higher, providing protection against dust and water spray. Power wiring should use cable sized according to local codes, typically 10 mm² for input and output connections. The motor cable length should not exceed 100 meters for unshielded cable and 50 meters for shielded cable. The drive includes an internal EMC filter for compliance with CE emission standards. The grounding terminal must be connected to a dedicated ground with impedance of less than 10 Ω.

Configuration and Operation

The VFPS1 4220PL is configured using the built-in keypad, which features a 4-line, 16-character LCD display and 8 function keys. The parameter structure is organized into intuitive groups: basic parameters for essential settings, motor parameters, control parameters, I/O configuration, PID parameters, communication settings, and monitoring parameters. The drive includes a quick-start wizard that guides users through setting motor nameplate data, selecting the control mode, and configuring the command source. Parameters can be saved to a non-volatile memory and copied to other drives using the optional parameter copy unit. The keypad supports password protection with a 4-digit code to prevent unauthorized changes. During operation, the keypad can display up to 4 monitored parameters simultaneously, selectable from over 50 available values including frequency, current, power, torque, motor speed, PID feedback, and I/O status. The drive includes a fault history log that stores the last 10 faults with time stamps and operating conditions at the time of fault. For advanced diagnostics, the optional software package allows connection to a PC for real-time data logging and oscilloscope-style waveform capture.