Siemens SINAMICS G120XA 55kW Variable Frequency Drive

Technical Overview

55kW, 380-440V IP20 variable frequency drive for pumps, fans, and compressors. Features Modbus RTU, BACnet MS/TP, and USS communication.

Key Features

Application-optimized for fans and pumps, suitable for HVAC and water/wastewater systems.
Integrated fieldbus protocols: MODBUS RTU, BACnet MS/TP, USS for flexible communication.
High efficiency and minimized energy consumption through optimized converter topology.
User-friendly operation with optional Intelligent Operator Panel (IOP-2) and web server module (Smart Access).
Robust design for harsh environments: IP20 protection and 3C2 conformal coating on PCBs.
Multi-pump control capability for up to four pumps.
Comprehensive protection functions: blocking, leakage, dry running, and cavitation.
Fire response mode for extended emergency operation.
Integrated PID controller for autonomous closed-loop control.
Wide input voltage tolerance (380-440V, -20% to +10%) for unstable power grids.

Technical Specification Matrix

Parameter	Value
Rated Power (LO)	55.00 kW
Input Voltage	3AC 380-440 V (-20% to +10%)
Input Frequency	47-63 Hz
Rated Current (LO)	106.00 A
Max. Output Current	113.00 A
Output Frequency (V/f control)	0-550 Hz
Protection Class	IP20
Frame Size	FSE
Ambient Temperature	-20 °C to +60 °C
Communication Protocols	USS, Modbus RTU, BACnet MS/TP
Digital Inputs	6
Digital Outputs (Relay Changeover Contact)	4
Analog Inputs	2 (Differential input)
Analog Outputs	2 (Non-isolated output)
Filter Class (integrated)	Unfiltered
Overload Capability (LO)	110% base load current for 60 s in a 600 s cycle
Physical Weight (kg)	27
Dimensions L x W x H (cm)	23.9 x 27.5 x 55.1

Industrial Applications

1. Water Treatment Plant Pumping Stations

This SINAMICS G120XA converter is ideally suited for controlling high-power industrial pumps in municipal water treatment and wastewater facilities, where precise flow regulation and robust operation are critical. Its 55 kW power output and integrated protection against dry running, leakage, and cavitation ensure efficient and reliable water transfer and processing. The IP20 rating requires installation within a control cabinet, common in such environments.

Problem Solved

Ensures reliable, energy-efficient operation and protection for critical pumping infrastructure, preventing system damage and optimizing water flow control.

PumpingWastewater Treatment55kWIP20Multi-pump controlDry running protection

2. Commercial Building HVAC Systems

The converter's optimization for fans and its BACnet MS/TP communication capability make it perfect for integrating into large commercial building HVAC systems. It can control powerful ventilation fans or chiller pumps (55 kW), precisely regulating air flow and temperature, which leads to significant energy savings and improved indoor climate control. The PID controller functionality allows for advanced, autonomous regulation of system variables.

Problem Solved

Provides energy-efficient and precise control of large HVAC components, contributing to lower operational costs and enhanced building comfort through smart automation.

HVACBuilding AutomationBACnet MS/TPFan ControlPID Control55kW

3. Industrial Air Compressor Control

With a 55 kW rated power and specific suitability for compressor applications, this VFD can precisely manage the speed of industrial air compressors, matching output to demand. This dynamic control reduces energy consumption and wear on mechanical components. The 110% overload capability for 60 seconds allows it to handle sudden increases in air demand without interruption. Its multiple digital and analog I/O points facilitate comprehensive monitoring and control within an industrial network.

Problem Solved

Optimizes energy usage and extends the lifespan of industrial compressors by precisely controlling motor speed according to demand, while providing robust protection and monitoring capabilities.

Compressor Control55kWOverload CapabilityMotor ControlIndustrial AutomationDigital I/O