Control Techniques SP4403 Unidrive SP Drive Unit

Module Feature

SP4403 belongs to Control Techniques Unidrive SP frame 4 universal drive.

It supports asynchronous motor, synchronous servo motor and induction servo motor control. It has three SM option slots for fieldbus and I/O expansion, built-in PLC and encoder feedback interface. This obsolete model is widely used in printing, packaging, textile and conveying equipment motion control system.

Working principle

Three-phase AC power is rectified into DC bus, IGBT unit outputs adjustable PWM AC.

The main board executes V/F, open/closed loop vector or servo algorithm, receives setpoint and encoder feedback signals. It provides full protection including overcurrent, overvoltage, overtemperature and stall, and stores fault codes when protection triggers.

Onboard components

Rectifier bridge, IGBT inverter module, DC bus capacitors, current sampling circuit, main control board, operation keypad, cooling fan, terminal block, expansion slot.

LED indicators

Front LEDs display power, run status, fault alarm and communication link status.

Hardware self‑diagnosis

Power-on self-test and real-time monitoring detect phase loss, earth fault, overtemperature, bus deviation and encoder failure, fault data can be read by software.

Programming software

CTSoft, DriveManager, used for parameter setting, motor auto-tune and fault log backup.

Electrical & Process Parameters

Model:SP4403 Brand:Control Techniques (Nidec) Device type:Universal AC & servo drive Voltage:380~480V 3-phase AC Normal duty:55kW Heavy duty:45kW Control mode:V/F, vector, servo Function:High precision speed and closed-loop position control

Mechanical & Structure

Mounting:Cabinet panel mount

Protection class:IP20

Housing:Metal enclosed drive chassis

Environmental

Operating temperature:0℃ ~ +40℃

Storage temperature:-40℃ ~ +70℃

Ambient humidity:5~95% non‑condensing

Certification:CE, UL

Status:Original discontinued drive spare

Installation

Install on stable cabinet backplate, separate power cable and control cable routing.

Configure motor parameters and complete auto-tune after wiring. Install brake resistor for frequent deceleration load. Clean fan and radiator dust periodically.

Interface

3-phase power terminals, motor output terminals, analog/digital I/O, encoder port, SM expansion slot, keypad connector.

Diagnostic

Overcurrent fault: Short circuit on motor cable, damaged motor insulation, improper acceleration ramp.

DC bus overvoltage: Regenerative energy excess without brake resistor.

Tracking error: Encoder wiring loose, mechanical vibration, unmatched gain.

No keypad display: Auxiliary power supply damage.

Product Brief

Control Techniques SP4403 Unidrive SP frame4 universal drive, 55kW normal duty inverter for packaging and printing equipment maintenance replacement.