Siemens SINAMICS G120XA 75kW Frequency Converter

Technical Overview

75kW 3AC 380-440V unfiltered frequency converter with IP20 protection, Modbus RTU/BACnet MS/TP/USS, optimized for pump/fan applications.

Key Features

Optimized for pump, fan, and compressor applications in infrastructure and building automation.
Integrated Fieldbus support for MODBUS RTU, BACnet MS/TP, and USS communication.
Robust design with IP20 protection and wide operating temperature range for demanding environments.
Includes features such as hibernation mode, multi-pump control, frost protection, and condensation protection.
Easy and fast setup with optimized user interfaces, supporting optional IOP-2 or SINAMICS G120 Smart Access web server module.
Low Overload (LO) capability of 110% base load current for 60 seconds within a 600-second cycle time.
Integrated hardware and software functions for enhanced energy efficiency in the complete process chain.

Technical Specification Matrix

Parameter	Value
Input Number of Phases	3 AC
Input Line Voltage	380 ... 440 V +10% -20%
Input Line Frequency	47 ... 63 Hz
Rated Current (LO)	143.00 A
Output Number of Phases	3 AC
Output Rated Voltage	400 V
Rated Power IEC 400V (LO)	75.00 kW
Output Rated Current (LO)	136.00 A
Max. Output Current	150.00 A
Pulse Frequency	4 kHz
Output Frequency for Vector Control	0 ... 240 Hz
Output Frequency for V/f Control	0 ... 550 Hz
Overload Capability (LO)	110% base load current IL for 60s in a 600s cycle time
Power Factor λ	0.75 ... 0.93
Efficiency η	0.98
Sound Pressure Level (1m)	73.1 dB
Power Loss	1.720 kW
Integrated Filter Class	Unfiltered
Protection Class	IP20
Frame Size	FSF
Communication Interfaces	USS, Modbus RTU, BACnet MS/TP
Standard Digital Inputs	6
Digital Input Switching Level (0→1)	11 V
Digital Input Switching Level (1→0)	5 V
Max. Digital Input Inrush Current	15 mA
Digital Outputs (Relay Changeover Contact)	4
Digital Output (Resistive Load)	DC 30 V, 1.0 A
Analog / Digital Inputs	2 (Differential input)
Analog Input Resolution	12 bit
Analog Input Switching Threshold (0→1)	4 V
Analog Input Switching Threshold (1→0)	1.6 V
Analog Outputs	2 (Non-isolated output)
Motor Temperature Sensor Input	1 (PTC, KTY, PT1000, Thermo-Click), accuracy ±5 °C
Physical Weight (kg)	66.8
Dimensions L x W x H (cm)	36 x 30.5 x 70.9

Industrial Applications

1. Industrial Water Treatment Plant Pump Control

This converter precisely controls the speed of 75kW 3-phase AC pumps in water treatment facilities, regulating flow rates and pressure based on demand. Its Modbus RTU or BACnet MS/TP communication allows seamless integration into the plant's SCADA system for remote monitoring and control.

Problem Solved

Ensures optimal water flow and pressure, reducing energy consumption through variable speed control and providing remote diagnostics and control within the plant's automation network. The 75kW power rating and 380-440V input are ideal for typical industrial pumps.

75kW pump3-phase ACModbus RTUBACnet MS/TPvariable frequency drivewater treatmentflow control

2. HVAC System Fan Control in Commercial Buildings

The SINAMICS G120XA manages 75kW fan motors in large commercial building HVAC systems. Its BACnet MS/TP support is ideal for integrating with Building Management Systems (BMS) to maintain precise temperature, pressure, and air quality control, while its IP20 rating suits installation within electrical cabinets.

Problem Solved

Optimizes energy usage for building ventilation by dynamically adjusting fan speeds based on environmental conditions and occupancy. Integration with existing BMS is streamlined for centralized control and reporting, leveraging BACnet MS/TP communication.

75kW fanHVACBACnet MS/TPbuilding automationvariable speed controlair qualityIP20

3. Industrial Air Compressor Management

This drive controls 75kW 3-phase AC air compressors in manufacturing plants, maintaining consistent air pressure for pneumatic tools and processes. The integrated digital and analog I/O, along with USS communication, allows for local sensor feedback and control within a localized control loop.

Problem Solved

Ensures a stable and efficient compressed air supply by adjusting compressor output to match demand. This prevents over-pressurization and reduces wear on mechanical components, leading to energy savings and extended equipment lifespan, supported by the 75kW capacity and flexible I/O.

75kW compressor3-phase ACUSS communicationpneumatic systemspressure controlindustrial automation