Control Techniques SPMD1403 Unidrive SPM Inverter Power Module Unit

Module Feature

SPMD1403 is the inverter power module of Nidec Control Techniques Unidrive SPM modular drive system, only accepts DC bus supply and must match SPMC series rectifier module to build complete drive set. Rated continuous output current 246A normal duty, peak 290A for heavy overload, corresponding to 132kW normal load and 160kW heavy duty at 400V class. Integrated dynamic brake chopper for regenerative energy dissipation with external brake resistor. It supports open-loop V/F, sensorless vector, closed-loop flux vector and servo position control, compatible with induction motor and permanent magnet servo motor. Multiple option slots can install encoder feedback card, fieldbus card such as Profinet, EtherCAT, DeviceNet. It adopts forced air cooling, built-in comprehensive hardware protection. Widely used for metallurgy, crane, extruder, large fan, pump and high dynamic CNC machine axis.

Working principle

Stable DC voltage from shared DC bus enters this inverter module. IGBT power stage converts DC into adjustable frequency and adjustable voltage three-phase AC to drive motor. Encoder feedback signal is processed for closed-loop speed or position loop. When motor decelerates, regenerative energy charges DC bus capacitor; once bus voltage exceeds threshold, internal brake chopper turns on to discharge energy on external resistor. Drive communicates with PLC or motion controller via fieldbus to receive setpoint and upload status and fault information.

Onboard components

IGBT power stack, current sampling circuit, brake chopper circuit, main control DSP board, backplane interface, option card expansion slots, cooling fan assembly, DC bus and motor output terminal block.

LED indicators

Front LEDs for power ready, drive enable, fault and communication activity; detailed alarm codes and parameters display on compatible Unidrive keypad.

Hardware self‑diagnosis

Power-on self-test detects DC bus over/under voltage, output overcurrent, IGBT short circuit, module overtemperature, fan stall, encoder fault and option card communication loss. Fault codes and runtime records are stored in drive memory.

Programming software

Control Techniques Unisoft software for parameter configuration, auto-tuning, fault diagnosis and firmware upgrade.

Electrical & Process Parameters

Model:SPMD1403 Brand:Nidec Control Techniques Series:Unidrive SPM Type:DC Input Inverter Module Rating:132kW normal / 160kW heavy duty Continuous output current:246A Max output current:290A DC bus range:460~730V DC Cooling:Forced air cooling Brake:Built-in brake chopper Function:Variable speed and position control for AC asynchronous and servo motors

Mechanical & Structure

Mounting:Cabinet backplane rack mount Protection class:IP20 Housing:Metal chassis

Environmental

Operating temperature:0℃ ~ +40℃, derate above 40℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:CE, IEC61800-3 compliant Status:Control Techniques original SPM inverter spare

Installation

Install in ventilated control cabinet, pair with matched SPMC rectifier. Connect DC bus cable, motor three-phase cable and brake resistor wiring. Install required feedback or fieldbus option cards. Complete motor identification and loop auto-tune in Unisoft. Verify emergency stop and brake function before commissioning. Keep fan and air filter clean regularly.

Interface

DC bus input terminals, U/V/W motor output terminals, brake resistor terminals, option card slots, control power and feedback connectors.

Diagnostic

Overcurrent trip: Motor insulation damage, cable short circuit or mechanical locking. DC bus overvoltage: Brake resistor missing, brake circuit fault or fast deceleration without regeneration rectifier. Over-temperature fault: Fan failure, blocked air channel or continuous heavy overload. Option card communication fault: Loose card, incompatible firmware or backplane contact problem.

Product BriefNidec Control Techniques SPMD1403 Unidrive SPM modular inverter, 132kW /160kW, DC bus input, built-in brake chopper, multi control mode and expandable fieldbus, used for heavy-duty fan, pump, crane and machine tool motor speed and position control.