Product Overview
The Emerson SP4403 is a high-performance universal AC variable speed drive from the Unidrive SP series, engineered by Control Techniques to deliver precise motor control across a wide spectrum of industrial applications. The Emerson SP4403 operates with a three-phase input voltage range of 380 to 480 VAC and provides 75 horsepower (approximately 55 kW) of output power, with a current rating of 96 to 104 amperes . This drive represents the culmination of Control Techniques’ expertise in motor control technology, offering a truly universal platform that accommodates induction motors, servo motors, and synchronous motors within a single device.
The Emerson SP4403 distinguishes itself through its remarkable flexibility in operating modes. Users can configure the drive for open-loop V/Hz control, open-loop vector control, closed-loop vector control, servo control for permanent magnet motors, or regenerative control—all selectable as standard without additional hardware . This multi-mode capability eliminates the need for multiple drive types within a facility, reducing spare parts inventory and simplifying maintenance training. The Emerson SP4403 also features an active front-end control mode that eliminates harmonic distortion and enables energy regeneration, allowing braking energy to be returned to the supply rather than dissipated as heat .
With an output frequency range of 0 to 550 Hz and a switching frequency range of 3 to 18 kHz, the Emerson SP4403 delivers smooth, precise motor control across diverse speed requirements . The drive includes an onboard EMC filter compliant with EN 61800-3, dynamic braking control, and RS-485/Modbus RTU communication as standard. For expanded functionality, the Emerson SP4403 supports a comprehensive range of option modules including fieldbus interfaces, additional I/O, encoder feedback cards, and programmable application modules . This scalability ensures the drive can be tailored to meet evolving application requirements without complete replacement.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | |
| Manufacturer | Emerson / Control Techniques (Nidec) |
| Product Type | Universal AC Variable Speed Drive |
| Product Line | Unidrive SP |
| Input Voltage | 380 to 480 VAC |
| Input Phase | Three-Phase |
| Input Frequency Range | 48 to 65 Hz |
| Output Power | 75 HP (55 kW at 120% overload; 45 kW at 150% overload) |
| Current Rating | 96 to 104 Amperes |
| Output Frequency Range | 0 to 550 Hz |
| Switching Frequency | 3 to 18 kHz |
| Control Methods | Open-loop V/Hz, Open-loop Vector, Closed-loop Vector, Servo, Regenerative, Rotor Flux Control |
| Communication Protocol | RS-485, Modbus RTU |
| Analog I/O | 3 Analog Inputs, 2 Analog Outputs |
| Digital I/O | 6 Digital Inputs, 4 Digital Outputs |
| Protection Class | IP20 |
| Operating Temperature | 0 to 40°C (non-condensing) |
| Storage Temperature | -40 to 70°C (non-condensing) |
| Weight | Approximately 34 kg (75 lbs) |
