Siemens SINAMICS G120C Compact Inverter 7.5kW

Technical Overview

380-480V 7.5kW compact inverter with PROFINET/EtherNet/IP, IP20 rating, and integrated fail-safe input for 3-phase AC motor control.

Key Features

Multiple control modes: V/f linear, square-law, ECO, V/f with flux current control, and sensorless vector control.
High overload capability: 200% for 3 seconds in HO mode; 150% for 3 seconds in LO mode.
Integrated fail-safe digital input for use in safety-rated installations.
Compact FSB frame with air-cooled integrated fan suits space-limited control panels.
Unfiltered external 24V I/O interface: 6 digital inputs, 2 digital outputs, 1 analog input, 1 analog output, and 1 motor temperature input.
Safe Torque Off (STO) integrated.
Efficiency reaches 97% at rated load, achieving IE2 efficiency class.

Technical Specification Matrix

Parameter	Value
Input Voltage	3AC, 380-480V (+10%/-20%)
Input Frequency	47-63 Hz
Rated Output Power (Low Overload)	7.50 kW / 10.00 hp
Rated Output Power (High Overload)	5.50 kW / 7.50 hp
Rated Output Current (Low Overload)	16.50 A
Rated Output Current (High Overload)	12.50 A
Max. Output Current	25.00 A
Output Frequency (Vector Control)	0-240 Hz
Output Frequency (V/f Control)	0-550 Hz
Pulse Frequency	4 kHz
Efficiency	97%
Power Loss	228 W
Ambient Temperature (Operation)	-10 to 40°C
IP Rating	IP20 / UL open type
Frame Size	FSB
Communication Interfaces	PROFINET, EtherNet/IP
Digital Inputs	6 standard + 1 fail-safe
Digital Outputs	1 relay changeover, 1 transistor
Analog / Digital Input	1 differential (10-bit resolution)
Analog Output	1
Physical Weight (kg)	2.7
Dimensions L x W x H (cm)	26 x 25.5 x 12.5

Industrial Applications

1. Conveyor Belt Systems for Material Handling

This inverter can precisely control the speed of 3-phase AC motors powering conveyor belts in manufacturing or logistics facilities. The 7.5 kW rated power is suitable for medium-duty conveyor applications, ensuring efficient material flow.

Problem Solved

Enables soft start/stop to reduce mechanical stress and wear on the conveyor system, provides precise speed control for different product types or processing stages, and achieves energy savings through optimized motor operation. The integrated PROFINET/EtherNet/IP allows for seamless integration with plant-wide automation systems.

Variable speed controlMaterial handling3-phase AC motor7.5 kWPROFINETEtherNet/IPSoft startEnergy efficiency

2. Industrial Pump Control in Water Treatment Facilities (Indoor)

The SINAMICS G120C is well-suited for regulating the flow rate of pumps in water treatment plants by adjusting the motor speed. The 380-480V input is standard for industrial power, and the 7.5 kW output is adequate for various pump sizes.

Problem Solved

Optimizes pump performance to match demand, significantly reduces energy consumption by avoiding constant full-speed operation, and minimizes water hammer effects. The IP20 rating makes it suitable for installation within a protective control cabinet, safeguarding it from dust in an indoor environment.

Pump controlVariable frequency driveWater treatmentFlow rate regulation7.5 kWIP20Energy savings

3. HVAC Fan Control for Building Automation Systems

This compact inverter can efficiently manage the speed of large ventilation fans in commercial or industrial HVAC systems. Its ability to handle 380-480V and provide variable frequency output makes it an ideal solution for optimizing air circulation.

Problem Solved

Provides demand-controlled ventilation, leading to significant energy savings by reducing fan speed during off-peak times or lower occupancy. Its compact FSB frame (100x196x203 mm) allows for efficient installation in control panels within building mechanical rooms, while PROFINET/EtherNet/IP enables robust integration with building management systems.

HVACFan controlBuilding automationVariable speed driveEnergy optimization7.5 kWCompact designPROFINETEtherNet/IP