Siemens SINAMICS G120XA 11kW Frequency Converter

Technical Overview

11 kW, 3AC 380-440V frequency converter with IP20, integrated Modbus RTU/BACnet/USS, and conformal coating for fan, pump, and HVAC applications.

Key Features

Optimized for Fan/Pump Applications: Includes built-in application macros for HVAC, water supply, and wastewater systems.
Integrated Fieldbus Communication: Supports MODBUS RTU, BACnet MS/TP, and USS for straightforward system integration.
Wide Voltage Tolerance: Operates reliably with 380-440V (-20% ~ +10%) input, suitable for unstable power grids.
Conformal Coating: Equipped with a PCB featuring 3C2 conformal coating for robust protection in harsh environments.
Easy Commissioning: Facilitates quick setup and configuration through application wizards and macros.
Compact Design: Features a space-saving FSC frame size suitable for cabinet installation.
Low Overload Capability (LO): Offers 110% base load current (IL) for 60 seconds within a 600-second cycle time.
Versatile Control Modes: Supports both V/F control and vector control for flexible motor operation.
Comprehensive I/O: Provides 6 digital inputs, 4 relay digital outputs, 2 differential analog inputs, 2 non-isolated analog outputs, and 1 motor temperature sensor input.

Technical Specification Matrix

Parameter	Value
Rated Power (LO)	11 kW (15 HP)
Rated Output Current (LO)	25.0 A
Rated Input Current (LO)	25.80 A
Input Voltage	3AC 380-440V (-20% ~ +10%)
Input Frequency	47-63 Hz
Rated Output Voltage	400 V
Max Output Current	27.5 A
Filter Class	Unfiltered (UF)
Protection Grade	IP20
Frame Size	FSC
Cooling	Integrated fan
Ambient Temperature	-20 °C to +45 °C
Control Modes	V/F control, Vector control
Digital Inputs	6
Digital Outputs (Relay)	4
Analog Inputs	2 (Differential)
Analog Outputs	2 (Non-isolated)
Motor Temperature Input	1 (PTC, KTY, PT1000, Thermo-Click)
Communication Protocols	MODBUS RTU, BACnet MS/TP, USS
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 for 60s in 600s cycle
Power Factor λ	0.75 - 0.93
Efficiency η	0.98
Sound Pressure Level (1m)	67 dB
Power Loss	0.329 kW
Conformal Coating	PCB with 3C2 coating
Physical Weight (kg)	7
Dimensions L x W x H (cm)	20.9 x 14 x 29.5

Industrial Applications

1. HVAC Air Handling Unit Control

Precisely controls the speed of large industrial fans within air handling units (AHUs) to regulate airflow, optimize temperature, and maintain desired building pressure. This application leverages the drive's 11 kW output and 380-440V input for efficient operation of medium-sized fans, while integrated BACnet and Modbus RTU ensure seamless integration with Building Management Systems (BMS).

Problem Solved

Prevents inefficient on/off cycling and fixed-speed operation of HVAC fans, thereby significantly reducing energy consumption, minimizing mechanical wear, and allowing dynamic adjustment to varying air volume requirements.

Variable Air Volume (VAV)Energy EfficiencyBuilding Management System (BMS)Fan ControlHVACModbus RTUBACnet11 kW380-440V

2. Industrial Water Pumping Station

Manages the speed of pumps in water treatment plants, irrigation systems, or industrial cooling loops to maintain constant pressure or flow, adapting dynamically to varying demand. The 11 kW power rating and 380-440V input are suitable for common industrial pumps, and the conformal coating protects internal electronics in humid environments, even with the IP20 rating requiring an enclosure.

Problem Solved

Eliminates the need for mechanical flow control valves and reduces water hammer, which enhances system longevity and significantly lowers energy costs by precisely matching pump output to the actual demand.

Constant PressureVariable FlowWater TreatmentPump ControlEnergy SavingWater Hammer MitigationIP20 (with enclosure)380-440V11 kWConformal Coating

3. Exhaust Fan Control in Manufacturing

Regulates the speed of exhaust fans in manufacturing facilities, workshops, or chemical processing areas to effectively remove fumes, dust, or maintain critical air quality levels based on sensor feedback. The drive's 11 kW capacity handles medium-to-large exhaust systems, and its wide 380-440V voltage tolerance ensures reliable operation in typical industrial power environments.

Problem Solved

Optimizes ventilation by preventing both wasteful over-ventilation (reducing energy consumption) and hazardous under-ventilation (ensuring worker safety and compliance), dynamically adjusting to real-time air quality or occupancy changes.

Air Quality ControlFume ExtractionVariable Speed DriveIndustrial VentilationEnergy OptimizationSensor Feedback11 kW380-440V