Nidec Control Techniques SPMD1403 Unidrive SP Power Module Unit

Module Feature

SPMD1403 is the power module of Nidec Control Techniques Unidrive SP series, designed for high power industrial variable speed applications. It supports multiple motor control modes including V/F, open-loop vector and closed-loop vector with encoder feedback. Built-in dynamic brake chopper for fast stopping, heavy duty rating allows continuous operation under overload conditions. It adopts modular design and can work with SP control card, different communication options such as Profibus, Ethernet, CANopen are available. Widely applied on large water pumps, induced draft fans, extruders, mixers and bulk material conveyor systems.

Working principle

Three-phase AC supply is rectified to DC bus, then IGBT power bridge outputs adjustable frequency and voltage to drive the motor. The vector algorithm optimizes torque output across full speed range. The drive monitors bus voltage, output current, module temperature and motor feedback signals continuously. Protection action will be triggered automatically when fault condition is detected. Drive parameters and fault logs can be configured via Unidrive SP software.

Onboard components

3-phase rectifier assembly, IGBT power stage, current transformers, dynamic brake circuit, cooling fan assembly, power interface terminals, control card slot.

LED indicators

Front panel LEDs indicate power status, drive enable, running, fault and communication activity.

Hardware self‑diagnosis

Auto self-test on power up. Detects phase loss, overcurrent, overvoltage, undervoltage, overtemperature, brake fault, encoder loss and communication timeout, and stores fault codes.

Programming software

Unidrive SP software, used for motor auto-tuning, ramp setup, I/O mapping, communication configuration and firmware upgrade.

Electrical & Process Parameters

Model:SPMD1403 Brand:Nidec Control Techniques Device type:Modular AC Inverter Power:132kW normal / 160kW heavy duty Current:246A normal / 290A heavy duty Voltage:380-480V 3-phase Control:V/F, Sensorless Vector, Closed-loop Vector Function:High power AC motor speed and torque regulation

Mechanical & Structure

Mounting:Vertical cabinet mounting Protection class:IP00 Housing:Metal power module chassis with forced air cooling

Environmental

Operating temperature:0℃ ~ +40℃ (derate above 40℃ for heavy duty) Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:CE, UL compliant Status:Nidec Control Techniques original drive spare

Installation

Install vertically inside the switch cabinet and maintain sufficient ventilation space. Separate power cables and shielded encoder cables. Fit control card and communication option module as required, complete motor identification and auto-tuning before commissioning. Clean heat sink and fan regularly.

Interface

Three-phase main power terminals, motor output terminals, DC bus terminals, brake resistor terminals, control card connector, fan terminals.

Diagnostic

Overcurrent: Motor short circuit, earth fault, mechanical block, incorrect motor parameters. Overtemperature: Fan failure, clogged heat sink, ambient temperature exceeds limit. Brake fault: Brake transistor damage, external resistor open circuit. Communication failure: Control card loose, bus cable damaged, incorrect termination.

Product BriefNidec Control Techniques SPMD1403 Unidrive SP modular inverter, 132/160kW, heavy duty rating with built-in brake chopper, for large pump, fan and extruder motor control.