Siemens SINAMICS G120XA 22kW Frequency Converter

Technical Overview

22kW 3AC 380-440V frequency converter for pumps/fans. Features IP20, 0-550Hz output, Modbus/BACnet, 6 DI, 4 DQ. Ensures energy-efficient motor control.

Key Features

Optimized for pump, fan, and compressor applications
Integrated Fieldbus communication: USS, Modbus RTU, BACnet MS/TP
Wide operating temperature range
Stable operation during line supply fluctuations
High efficiency (η = 0.97)
Low overload capability (110% for 60s in 300s cycle)
6 standard digital inputs and 2 analog/digital inputs
4 digital relay outputs and 2 analog outputs
PTC/KTY interface for motor temperature sensing
Integrated PID controller for autonomous closed-loop control
Multi-pump control capability for up to four pumps
Protection against blocking, leakage, dry running, and cavitation
Fire response mode for extended emergency operation
Skip frequencies for avoiding critical vibrations
Real-time clock for switching setpoints or controlling releases

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
Input Rated Current (LO)	46.00 A
Output Number of Phases	3 AC
Output Rated Voltage	400 V
Output Rated Power IEC 400V (LO)	22.00 kW
Output Rated Current 400V (IN)	43.00 A
Output Rated Current 380V (IN)	45.00 A
Output Rated Current (LO)	43.00 A
Max. Output Current	48.00 A
Pulse Frequency	4 kHz
Output Frequency (Vector Control)	0 ... 240 Hz
Output Frequency (V/f Control)	0 ... 550 Hz
Overload Capability (LO)	110% base load current IL for 60 s in a 300 s cycle time
Power Factor λ	0.75 ... 0.93
Offset Factor cos φ	0.99
Efficiency η	0.97
Sound Pressure Level (1m)	62.2 dB
Power Loss	0.634 kW
Filter Class (integrated)	Unfiltered
EMC Category (with accessories)	without
Safety Function 'Safe Torque Off'	without SIRIUS device (e.g. via S7-1500F)
Communication Protocols	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
Fail-safe Digital Inputs	0
Digital Outputs (Relay Changeover Contact)	4
Digital Output (Resistive Load)	DC 30 V, 1.0 A
Digital Outputs (Transistor)	0
Analog / Digital Inputs	2 (Differential input)
Analog / Digital Input Resolution	12 bit
Analog / Digital Input Switching Threshold (0 → 1)	4 V
Analog / Digital Input Switching Threshold (1 → 0)	1.6 V
Analog Outputs	2 (Non-isolated output)
PTC/KTY Interface	1 motor temperature sensor input (PTC, KTY, PT1000, Thermo-Click), accuracy ±5 °C
Closed-loop Control Techniques	V/f linear / square-law / parameterizable
IP Rating	IP20
Physical Weight (kg)	17.9
Dimensions L x W x H (cm)	23.9 x 20 x 47.2

Industrial Applications

1. High-Efficiency Water Pumping Station Flow Control

This frequency converter can precisely control the speed of large industrial pumps (up to 22 kW rated power, 400V output) in water/wastewater treatment plants, ensuring optimal flow rates and pressure regulation based on demand. Its IP20 rating requires installation within a protective enclosure, suitable for control room or cabinet integration.

Problem Solved

Reduces energy consumption and wear on mechanical components by enabling variable flow control, avoiding fixed-speed pump operation. The integrated PID controller facilitates autonomous closed-loop control based on analog input values from pressure sensors.

22 kW400 VVariable Frequency DrivePID controlWater/WastewaterPump ControlEnergy Efficiency

2. Optimized Airflow Regulation in Large Commercial HVAC Systems

The SINAMICS G120XA is ideal for regulating the speed of powerful fans (up to 22 kW) in large air handling units (AHUs) within commercial buildings or industrial facilities. Its capability to communicate via BACnet MS/TP allows for seamless integration into Building Management Systems (BMS), enabling precise environmental control.

Problem Solved

Provides precise airflow and pressure control, leading to significant energy savings by adjusting fan speed to actual ventilation requirements, rather than relying on inefficient damper control. The wide input voltage range (380-440V AC) accommodates typical industrial power supplies.

22 kWHVACFan ControlAHUBACnet MS/TPEnergy SavingBuilding AutomationAirflow Optimization

3. Energy-Efficient Compressed Air Production

This frequency converter can be employed to control the motor speed of industrial air or gas compressors (up to 22 kW), optimizing compressed air production to match real-time demand. This dynamic control improves overall system efficiency and extends the operational lifespan of the compressor.

Problem Solved

Addresses the energy inefficiency of traditional fixed-speed compressors when air demand fluctuates. The G120XA precisely modulates compressor speed, significantly reducing power consumption during low demand periods while maintaining high efficiency (η = 0.97). Its PTC/KTY interface can monitor motor temperature for safe and reliable operation.

22 kWCompressor ControlEnergy EfficiencyVariable Speed DriveIndustrial Air SystemsMotor Temperature Monitoring