Technical Overview

Compact AC inverter drive for 3-phase 380-480V applications, offering 3.0kW (LO) or 2.2kW (HO) power. Features STO, USS/MODBUS RTU, IP20 protection.

Key Features

3-phase input voltage: 380-480V AC (+10% / -20%), 47-63 Hz.
Output frequency range: 0-550 Hz (V/f control) or 0-240 Hz (vector control).
Integrated communication protocols: USS/MODBUS RTU.
Built-in Safe Torque Off (STO) function to SIL 2.
Flexible I/O: 6 standard digital inputs, 1 fail-safe digital input, 2 digital outputs (1 relay, 1 transistor), 1 analog/digital input, 1 analog output.
Protection rating: IP20 / UL Open Type.
Compact Frame Size A (FSA) dimensions for space-saving installation.
Overload capability: 150% base load for 3s, 110% for 57s (LO); 200% for 3s, 150% for 57s (HO).

Technical Specification Matrix

Parameter	Value
Input Voltage (Phases)	3 AC
Input Voltage Range	380 ... 480 V +10% -20%
Line Frequency	47 ... 63 Hz
Rated Input Current (LO)	9.50 A
Rated Input Current (HO)	8.20 A
Output Voltage (Phases)	3 AC
Rated Output Voltage	400V IEC / 480V NEC
Rated Power (LO)	3.00 kW (4.00 hp)
Rated Power (HO)	2.20 kW (3.00 hp)
Rated Output Current (LO)	7.30 A
Rated Output Current (HO)	5.60 A
Max. 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 for 3 s, 110 % for 57 s in a 300 s cycle
Overload Capability (HO)	200 % base load current for 3 s, 150 % for 57 s in a 300 s cycle
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 Interface	USS/MODBUS RTU
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 Class	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. Variable Speed Conveyor Systems

The SINAMICS G120C effectively controls the speed of AC induction motors in conveyor belt systems, optimizing material flow and energy consumption. Its variable frequency and vector control capabilities ensure smooth acceleration and deceleration, while the integrated Safe Torque Off (STO) function provides critical safety for personnel and equipment during maintenance or emergencies.

Problem Solved

Provides precise speed control and safety features for conveyor systems, preventing material jams and enabling safe operation and maintenance.

Variable Frequency DriveAC Induction MotorSpeed RegulationSafe Torque Off (STO)Vector ControlOverload Protection

2. HVAC Pump and Fan Control

This drive is ideal for controlling pumps and fans in HVAC systems, allowing for precise regulation of fluid flow or air volume. Its high efficiency (η 0.97) and ability to operate in V/f control across a broad frequency range (0-550 Hz) contribute to significant energy savings by matching motor speed to demand. The IP20 rating ensures suitability for cabinet installation in controlled environments.

Problem Solved

Optimizes energy usage in HVAC systems by providing demand-based control for pumps and fans, leading to reduced operational costs and improved system performance.

HVACPump ControlFan ControlEnergy EfficiencyV/f ControlFlow RegulationIP20

3. Small Industrial Mixers and Agitators

For small-scale industrial mixers and agitators, the SINAMICS G120C provides the necessary precise speed and torque control. Its vector control mode (0-240 Hz) delivers dynamic performance, crucial for applications requiring consistent mixing. The drive's high overload capacity (up to 200% for 3s) handles startup against high inertia or sudden changes in material viscosity, while flexible I/O and MODBUS RTU enable integration with process sensors and control systems.

Problem Solved

Ensures consistent product quality and process efficiency in mixing applications by offering precise motor control and handling dynamic load conditions.

Torque ControlSpeed ControlVector ControlMixersAgitatorsMODBUS RTUOverload CapacityDigital/Analog I/O

Siemens SINAMICS G120C 3kW Compact Inverter Drive

Siemens SINAMICS G120C 3kW Compact Inverter Drive

Technical Overview

Key Features

Technical Specification Matrix

Industrial Applications

1. Variable Speed Conveyor Systems

2. HVAC Pump and Fan Control

3. Small Industrial Mixers and Agitators