Siemens SINAMICS G120C 1.1kW Frequency Converter

Technical Overview

Compact 1.1 kW (LO) / 0.75 kW (HO) 3AC 380-480V frequency converter with IP20, integrated STO, PROFINET, and extensive I/O for precise motor control.

Key Features

Compact installation size.
PROFINET communication interface.
Safe Torque Off (STO) function integrated.
3-phase input voltage 380-480 V AC (+10% / -20%).
Rated power of 1.1 kW (Low Overload) / 0.75 kW (High Overload).
IP20 protection rating.
Unfiltered design.
External 24V I/O interface with 6 Digital Inputs, 1 Fail-Safe Digital Input, 2 Digital Outputs (1 relay, 1 transistor), 1 Analog Input, 1 Analog Output, and 1 Motor Temperature Sensor input.
Overload capability (LO): 150% base load current IL for 3 s, then 110% for 57 s in a 300 s cycle.
Overload capability (HO): 200% base load current IH for 3 s, then 150% for 57 s in a 300 s cycle.
Energy-optimized vector control (SLVC) and automatic flux reduction.

Technical Specification Matrix

Parameter	Value
Input Voltage	3AC 380-480 V (+10% / -20%)
Input Frequency	47-63 Hz
Rated Power (Low Overload)	1.1 kW (1.50 hp)
Rated Power (High Overload)	0.75 kW (1.00 hp)
Rated Current Input (LO)	4.10 A
Rated Current Input (HO)	3.20 A
Rated Current Output (LO)	3.10 A
Rated Current Output (HO)	2.20 A
Max. Output Current	4.40 A
Pulse Frequency	4 kHz
Output Frequency (Vector Control)	0-240 Hz
Output Frequency (V/f Control)	0-550 Hz
Protection Class	IP20 / UL Open Type
Communication Interface	PROFINET, EtherNet/IP
Standard Digital Inputs	6
Fail-Safe Digital Inputs	1
Digital Outputs (Relay)	1 (DC 30 V, 0.5 A)
Digital Outputs (Transistor)	1 (DC 30 V, 0.5 A)
Analog/Digital Inputs	1 (Differential input, 10 bit resolution)
Analog Outputs	1 (Non-isolated output)
Motor Temperature Sensor Input	1 (PTC/KTY interface)
Safety Function	Safe Torque Off (STO)
Filter Class	Unfiltered
Power Factor λ	0.70 - 0.85
Offset Factor cos φ	0.95
Efficiency η	0.97
Sound Pressure Level (1m)	49 dB
Power Loss	48.1 W
Physical Weight (kg)	1.2
Dimensions L x W x H (cm)	22.5 x 27 x 8.5

Industrial Applications

1. Conveyor Belt Systems for Material Handling

This converter can precisely control the speed and torque of 3-phase AC motors on conveyor belts in manufacturing or logistics facilities. The 1.1 kW rating is suitable for medium-duty conveyors. The PROFINET communication allows for seamless integration into a plant's automation system, enabling centralized control and monitoring.

Problem Solved

Ensures smooth, controlled acceleration and deceleration of conveyor belts, preventing jerky movements that could damage transported goods or cause system wear. The integrated Safe Torque Off (STO) function enhances operational safety by reliably stopping the motor in emergencies.

Motor controlVariable speed driveMaterial handlingPROFINETSafe Torque Off3-phase AC motor1.1 kW

2. Pump and Fan Control in HVAC/Industrial Processes

Ideal for optimizing the operation of pumps and fans in industrial ventilation systems, cooling circuits, or water treatment plants. The ability to vary motor speed (0-550 Hz V/f control) allows for energy savings by matching pump/fan output to demand, rather than running at full speed constantly.

Problem Solved

Reduces energy consumption and operational costs by precisely controlling fluid flow or air movement based on process requirements. The IP20 rating means it can be installed within a protective control cabinet, common in these environments. The extensive I/O can be used for feedback sensors (e.g., pressure, flow) to implement closed-loop control.

HVACPump controlFan controlEnergy efficiencyVariable frequency driveProcess control380-480 VIP20

3. Mixing Applications in Chemical or Food Processing

Suitable for driving agitators and mixers in chemical, pharmaceutical, or food processing industries where precise control over mixing speed and torque is crucial. The high overload capability (up to 200%) handles transient load peaks, such as when mixing starts or material consistency changes.

Problem Solved

Enables precise and consistent mixing processes, critical for product quality and yield. The ability to handle high overload conditions ensures reliable operation even with viscous or challenging materials, preventing motor stalls. The Safe Torque Off (STO) provides essential safety during maintenance or unforeseen events.

MixerAgitatorTorque controlOverload protectionProcess consistencySafe Torque Off3-phase motor1.1 kW