Delta VFD037EL43A 3.7kW 5HP Three Phase VFD

Overview

The Delta VFD037EL43A is a 3.7 kW (5 HP) space-saving variable frequency drive (VFD) from Delta’s VFD-EL Series family. It is built for three-phase 460 V class industrial power, rated at 8.5 A, to drive motors up to 3.7 kW / 5 HP. It is intended for three-phase installations that need dependable, energy-saving speed control of an AC induction (and, on the newer series, permanent-magnet) motor. Direct three-phase input keeps the wiring simple in factory, plant and process settings, while the drive’s vector/V/f control holds motor speed steady as the load changes—protecting both the motor and the driven machine. With V/f (scalar) control with a 3-point adjustable V/f curve and an output range of 0.1–600 Hz, the VFD037EL43A gives precise, stepless speed control for variable-torque and constant-torque loads alike. Supplied with a built-in keypad, it is quick to commission for basic speed control and equally at home inside an OEM control panel.

Key Features

• Input: 3-Phase 380–480 V AC, 50/60 Hz
• Output: 3-Phase 0–480 V AC, 3.7 kW / 5 HP, rated 8.5 A
• Output frequency 0.1–600 Hz
• Overload capacity 150% of rated current for 60 seconds
• Built-in PID feedback control
• RFI switch and DC-bus sharing for side-by-side installation
• High-precision current detection with full electronic protection
• Communication: RS-485 (RJ-45), Modbus RTU
• Enclosure: IP20

Technical Benefits

At 8.5 A with 150% of rated current for 60 seconds, the drive handles the high starting torque and load impacts typical of pumps, compressors and material-handling equipment. Running fans and pumps at variable speed instead of a fixed 50 Hz cuts energy use sharply—on these loads, power scales with roughly the cube of speed—while soft start and stop reduce mechanical and belt wear and eliminate direct-on-line inrush current. The built-in EMI filter helps the panel meet electromagnetic-compatibility expectations without a separate filter, and DC-bus sharing lets several drives sit side by side to save cabinet space.

Selection & Compatibility

The VFD037EL43A pairs with standard three-phase 400/460 V induction motors up to 3.7 kW / 5 HP. As a sizing rule, match the drive to the motor’s full-load current rather than its kW alone: confirm the motor draws no more than 8.5 A, and for heavy constant-torque or high-inertia loads consider the next frame up for extra overload margin. Make sure a three-phase 380–480 V supply is available. For long motor cables or EMC-sensitive installations, add the recommended output reactor or a zero-phase core. Our engineers can confirm drive sizing, braking-resistor requirements and key parameter settings before you place the order.

Applications

Typical three-phase applications include:

• cooling-tower fans
• centrifugal pumps and water-supply systems
• mixers and agitators
• process pumps
• crushers and grinders
• industrial fans and blowers
• conveyors and material handling

About the Delta EL Series

The Delta VFD-EL is a proven new-generation micro-type AC drive built for simple, cost-effective speed control. It combines a genuinely compact footprint with a built-in EMI filter, RFI switch, built-in keypad, built-in PID control and Modbus connectivity, and supports optional Profibus, DeviceNet, CANopen and LonWorks modules. DC-bus sharing allows side-by-side mounting to save panel space.