Siemens SINAMICS G120C 18.5kW Compact Variable Frequency Drive

Technical Overview

Compact 18.5kW VFD for 380-480V 3AC motors with PROFINET/EtherNet/IP and Safe Torque Off. Features IP20 protection and extensive I/O.

Key Features

Compact design for space-saving installations.
Integrated PROFINET and EtherNet/IP communication.
Safe Torque Off (STO) functionality for machine safety.
Suitable for 3-phase 380-480V AC motor applications.
Low overload (LO) capability: 18.5 kW / 25 hp.
High overload (HO) capability: 15.0 kW / 20 hp.
Multiple digital and analog I/O for flexible control.
IP20 / UL OPEN TYPE protection for control cabinet mounting.
Air cooling with integrated fan.
Output frequency up to 550 Hz for V/f control.

Technical Specification Matrix

Parameter	Value
Input Number of Phases	3 AC
Input Line Voltage	380-480 V +10% -20%
Input Line Frequency	47-63 Hz
Input Rated Current (LO)	48.20 A
Input Rated Current (HO)	45.20 A
Output Number of Phases	3 AC
Output Rated Voltage	400V IEC / 480V NEC
Output Rated Power (LO)	18.50 kW / 25.00 hp
Output Rated Power (HO)	15.00 kW / 20.00 hp
Output Rated Current (LO)	37.00 A
Output Rated Current (HO)	31.00 A
Max. Output Current	62.00 A
Pulse Frequency	4 kHz
Output Frequency (Vector Control)	0-240 Hz
Output Frequency (V/f Control)	0-550 Hz
Low Overload Capability	150% base load current IL for 3s, then 110% for 57s in 300s cycle.
High Overload Capability	200% base load current IH for 3s, then 150% for 57s in 300s cycle.
Protection Rating	IP20 / UL OPEN TYPE
Digital Inputs (Standard)	6
Digital Inputs (Fail-safe)	1
Digital Outputs (Relay)	1 (DC 30 V, 0.5 A resistive load)
Digital Outputs (Transistor)	1 (DC 30 V, 0.5 A resistive load)
Analog Inputs	1 (Differential, 10-bit resolution)
Analog Outputs	1 (Non-isolated)
Communication Interfaces	PROFINET, EtherNet/IP
Efficiency	0.97
Sound Pressure Level (1m)	66 dB
Power Loss	434.0 W
Physical Weight (kg)	5.2
Dimensions L x W x H (cm)	27 x 36.5 x 16

Industrial Applications

1. Industrial Pump Control

Precisely controls the speed of centrifugal or positive displacement pumps in water treatment plants, chemical processing, or building services.

Problem Solved

Optimizes fluid flow and pressure, reducing energy consumption and mechanical wear on pump systems by adjusting motor speed to meet demand. The 18.5kW output handles medium to large pumps, while IP20 allows protected cabinet installation.

Variable frequency drivePump controlEnergy efficiencyFlow regulation18.5kW380-480VIP20

2. Conveyor System Automation

Manages the speed, acceleration, and deceleration of conveyor belts in material handling, logistics, or packaging lines.

Problem Solved

Ensures smooth and synchronized material transport, preventing product damage and allowing for precise throughput adjustments. Integrated PROFINET ensures seamless PLC integration, and Safe Torque Off (STO) provides critical safety for operators during maintenance.

Conveyor controlMaterial handlingSpeed synchronizationSafe Torque OffPROFINET18.5kW

3. HVAC Fan Speed Regulation

Controls the rotational speed of large industrial fans in heating, ventilation, and air conditioning (HVAC) systems for commercial and industrial buildings.

Problem Solved

Dynamically adjusts airflow to meet building climate requirements, leading to significant energy savings by eliminating wasteful full-speed operation. The 18.5kW rating and high efficiency (0.97) are ideal for optimizing air circulation in large facilities.

Fan controlHVAC optimizationEnergy savingAirflow regulationVariable speed18.5kW