Siemens 6SE6436-2BC31-8DA0 Micromaster 430 Frequency Inverter Unit

Module Feature

6SE6436-2BC31-8DA0 is a variable frequency drive of Siemens MICROMASTER 430 series.

This series is specially designed for centrifugal pumps and fans. It integrates PID regulator, sleep/wake-up function and skip frequency function to avoid mechanical resonance. It supports Modbus communication and multiple I/O configurations. It features soft start and stop to reduce water hammer and mechanical impact. Widely stocked as spare for HVAC, water treatment and industrial pump control cabinets.

Working principle

The rectifier converts three-phase AC power into DC, then the inverter bridge outputs variable-frequency AC power.

According to analog setpoint or bus command, the drive adjusts output frequency and motor speed to match flow or pressure requirement. Built-in PID continuously compares feedback signal with set value and automatically adjusts speed to maintain stable process. It provides overcurrent, overvoltage, overload and overtemperature protection.

Onboard components

Input rectifier module, IGBT inverter unit, drive control board, current & voltage sampling circuit, cooling fan, status LED bank and metal housing.

LED indicators

Front LEDs indicate power, run, fault and alarm status.

Hardware self‑diagnosis

Drive continuously monitors bus voltage, output current, heat sink temperature and motor overload. All parameters can be checked and modified on local BOP panel.

Programming software

Starter, used for parameter setting, online monitoring, fault diagnosis and firmware upgrade.

Electrical & Process Parameters

Model: 6SE6436-2BC31-8DA0 Brand: Siemens Device type: Micromaster 430 frequency inverter Function: Variable speed regulation for fan and pump motor, energy saving and process control

Mechanical & Structure

Mounting: Panel mounting inside control cabinet Protection class: IP20 Housing: Metal chassis with cooling fan

Environmental

Operating temperature: 0℃ ~ +40℃ Storage temperature: -40℃ ~ +85℃ Ambient humidity: 5~95% non‑condensing

Certification: CE Status: Original Siemens drive spare

Installation

Cut off three-phase input power before replacement.

Mount inverter on cabinet backplate, connect input power, motor cable and control wiring, set motor data and PID parameters, test speed regulation and protection function after commissioning.

Interface

Three-phase power input terminals, motor output terminals, analog/digital I/O terminals, Modbus communication port, BOP panel socket.

Diagnostic

Overcurrent fault: Motor short circuit, cable damage or acceleration time too short. Overheat alarm: Fan failure or insufficient cabinet ventilation. PID unstable: Feedback signal noise or PID gain improper.

Product Brief

6SE6436-2BC31-8DA0 inverter, Siemens Micromaster 430 variable frequency drive spare for fan and pump energy-saving speed control replacement.