Siemens SINAMICS G120C Compact Frequency Inverter 3.0kW

Technical Overview

3-phase 380-480V AC compact frequency inverter with 3.0kW (LO) / 2.2kW (HO) power, IP20 protection, vector control, PROFINET, and integrated Safe Torque Off.

Key Features

3-phase input voltage of 380–480V AC (+10% / -20%) with 47–63 Hz line frequency.
Rated power levels of 3.0 kW (Low Overload) and 2.2 kW (High Overload).
Supports V/f control with an output frequency range of 0–550 Hz and vector control up to 0–240 Hz.
Integrated Safe Torque Off (STO) function for enhanced safety.
Communication via PROFINET and EtherNet/IP for seamless system integration.
Features 6 standard digital inputs, 1 fail-safe digital input, 2 digital outputs, 1 analog input, 1 analog output, and 1 motor temperature sensor input.
High efficiency (η = 0.97) and power factor (λ = 0.70-0.85) for optimized energy usage.
Robust overload capabilities: 150% base load for 3s (LO) and 200% base load for 3s (HO).
Compact FSA size with IP20 / UL OPEN TYPE protection rating.

Technical Specification Matrix

Parameter	Value
Input Number of Phases	3 AC
Input Line Voltage	380 – 480 V AC (+10 % / -20 %)
Input Line Frequency	47 – 63 Hz
Rated Current (Low Overload)	9.50 A
Rated Current (High Overload)	8.20 A
Output Number of Phases	3 AC
Output Rated Voltage	400V IEC / 480V NEC
Rated Power (Low Overload)	3.00 kW (4.00 hp)
Rated Power (High Overload)	2.20 kW (3.00 hp)
Maximum Output Current	11.20 A
Pulse Frequency	4 kHz
Output Frequency (Vector Control)	0 – 240 Hz
Output Frequency (V/f Control)	0 – 550 Hz
Overload Capability (LO)	150 % base load current IL for 3 s, followed by 110 % base load current IL for 57 s in a 300 s cycle time.
Overload Capability (HO)	200% base load current IH for 3 s, followed by 150% base load current IH for 57 s in a 300 s cycle time.
Power Factor (λ)	0.70 – 0.85
Offset Factor (cos φ)	0.95
Efficiency (η)	0.97
Sound Pressure Level (1m)	52 dB
Power Loss	97.8 W
Filter Class (integrated)	Unfiltered
Communication Interfaces	PROFINET, EtherNet/IP
Standard Digital Inputs	6
Fail-safe Digital Inputs	1
Digital Outputs (Relay Changeover Contact)	1 (DC 30 V, 0.5 A)
Digital Outputs (Transistor)	1 (DC 30 V, 0.5 A)
Analog / Digital Inputs	1 (Differential, 10 bit resolution)
Analog Outputs	1 (Non-isolated)
Motor Temperature Sensor Input	1 (PTC, KTY compatible)
Protection Rating	IP20 / UL OPEN TYPE
Physical Weight (kg)	2.1
Dimensions L x W x H (cm)	22.5 x 27 x 8.5

Industrial Applications

1. Conveyor Belt Systems in Logistics

This drive can precisely control the speed and torque of motors driving conveyor belts in automated warehouses or production lines. The vector control ensures smooth acceleration and deceleration, preventing jerky movements that could damage goods or machinery.

Problem Solved

Ensures accurate and reliable material handling with variable speed requirements, preventing product damage and optimizing throughput. The Safe Torque Off (STO) feature enhances safety during maintenance, and PROFINET integration allows for seamless control within modern logistics systems.

Variable Speed DriveTorque ControlConveyorMaterial HandlingPROFINETSafe Torque Off3-Phase3.0 kW

2. Fan and Pump Control in HVAC Systems

The SINAMICS G120C can regulate the speed of fans in industrial ventilation systems or pumps in fluid transfer applications. Its high energy efficiency (η=0.97) and V/f control capability make it ideal for these variable-torque loads, significantly reducing energy consumption.

Problem Solved

Optimizes energy consumption in HVAC and pumping systems by dynamically matching motor speed to actual demand, leading to substantial operational cost savings and precise environmental control. Its 380-480V input and compact size are suitable for integrating into industrial building infrastructure.

HVACPump ControlFan ControlVariable Frequency DriveEnergy EfficiencyV/f Control380-480V

3. Machine Tool Auxiliary Spindle Control

For smaller machine tools or auxiliary spindles requiring accurate speed and torque, this drive provides precise control. The vector control (0-240 Hz output) enables fine-tuned operation during machining processes, critical for surface finish and tool life.

Problem Solved

Delivers accurate and dynamic speed and torque control for demanding machining operations, enhancing product quality and improving overall manufacturing efficiency. The compact dimensions (19.6 x 7.3 x 20.0 cm) facilitate integration into machine cabinets with limited space, and PROFINET ensures high-speed communication.

Machine ToolSpindle ControlVector ControlPROFINETIndustrial Automation3-PhaseCompact SizeHigh Overload Capability