Toshiba Inverter VFAS1-4750PL-WN1 Toshiba Transistor Inverter VFAS14750PLWN1 FAST SHIPPING

VFAS1-4750PL-WN1 | Toshiba Tosvert VF-AS1 Inverter — 75kW / 400V / 160A / 3-Phase / CT & VT Mode / Pumps / Fans / Conveyors

VF-AS1 Series — High-Performance General Purpose Drive

The Tosvert VF-AS1 is Toshiba's general-purpose variable frequency drive platform, covering a wide power range from sub-kilowatt to high-capacity industrial installations. The VFAS1-4750PL-WN1 sits at the 75kW point in the 400V class range — a capacity that covers medium-to-large process equipment including circulation pumps, high-volume fans, and loaded conveyor systems.

The VF-AS1 supports both CT (Constant Torque) and VT (Variable Torque) control modes. CT mode is for loads that require full torque across the speed range — conveyors, compressors, positive displacement pumps. VT mode is for centrifugal loads — fans and centrifugal pumps — where the required torque drops with speed. Selecting the correct mode optimises the drive's thermal management and output characteristics for the connected load type.

Key Specifications

Speed and Torque Control for Industrial Processes

A variable frequency drive controls motor speed by adjusting output frequency and voltage. The VFAS1-4750PL-WN1 controls the motor from near-zero speed to maximum rated speed, with smooth acceleration and deceleration ramps — eliminating the mechanical stress of direct-on-line starting.

For pump applications, variable speed control replaces throttling valves as the flow control mechanism. Running a pump at 70% speed uses approximately 34% of the power compared to full-speed throttled operation — the energy saving is proportional to the cube of the speed ratio. For large pumps and fans running continuously, this reduction in energy consumption represents the primary economic justification for drive installation.

At 75kW output, the VFAS1-4750PL-WN1 covers motor sizes appropriate for industrial water supply pumps, HVAC air handling units, process ventilation fans, and medium-duty conveyor drive systems.

Application Scenarios

Process water supply pump: A municipal water works pump station runs three 75kW centrifugal pumps in parallel. Each pump is controlled by a VFAS1-4750PL-WN1, allowing the station to match pump output to demand by varying speed rather than cycling pumps on and off.

Industrial ventilation fan: A large process plant ventilation fan requires variable airflow for different production modes. The 75kW drive replaces a fixed-speed motor with damper control — the fan speed is varied directly, eliminating damper losses.

Conveyor drive: A 75kW conveyor drive on a bulk material handling system requires smooth starting under full load. The VFAS1-4750PL-WN1 in CT mode provides controlled acceleration from rest, eliminating belt jerk and mechanical shock on startup.

FAQ

Q1: What does the "WN1" suffix in VFAS1-4750PL-WN1 indicate?

The suffix codes in the VF-AS1 part number indicate configuration options — enclosure type, filter options, and regional specification variants. The "WN1" suffix denotes the specific configuration of this particular unit, including its enclosure and filtration options. Confirm the exact configuration against the Toshiba VF-AS1 product selection guide when replacement or equivalent selection is needed.

Q2: What is the difference between CT and VT mode for the VFAS1-4750PL-WN1?

CT (Constant Torque) mode is selected for loads requiring full torque at all speeds — conveyors, compressors, positive displacement pumps. VT (Variable Torque) mode is for centrifugal loads — fans and centrifugal pumps — where torque demand drops with speed as the square law. Selecting VT mode on an appropriate load allows higher continuous current at full speed; selecting CT on a centrifugal load is safe but uses the more conservative CT thermal rating.

Q3: What input power supply is required for the VFAS1-4750PL-WN1?

The drive requires a 3-phase AC supply in the range 400–480V at 50Hz or 60Hz. The 400V nominal covers IEC standard industrial supplies (380V/400V/415V European/Asian networks). The 480V end covers North American and some Asian 460V/480V supplies. A correctly rated main circuit breaker or fused disconnect switch must be installed upstream of the drive per local electrical codes.

Q4: Does the VFAS1-4750PL-WN1 include a built-in braking resistor?

At 75kW, the VF-AS1 does not include a built-in braking resistor. An external braking resistor (model PBR7-017W3R7 for the 75kW variant) and braking unit are required for applications that need active deceleration braking — such as loads with high inertia or vertical loads requiring controlled descent. For pump and fan applications where coasting to stop is acceptable, the braking resistor is typically not required.

Q5: What motor types are compatible with the VFAS1-4750PL-WN1?

The VF-AS1 is designed for standard 3-phase AC induction motors. The drive's output characteristics match standard IEC or NEMA induction motors rated for the appropriate voltage class. For permanent magnet synchronous motors or special motor types, verify compatibility with the VF-AS1's control algorithm settings. The motor's rated current must not exceed the drive's 160A output rating.