Technical Overview

Compact 380-480V 18.5kW (LO) VFD with PROFIBUS DP and Safe Torque Off, ideal for precise motor control in industrial environments.

Key Features

3-phase AC input voltage: 380-480V (+10% / -20%) at 47-63Hz.
Rated power (Low Overload): 18.5kW (25hp) with 150% overload for 3s, 110% for 57s.
Rated power (High Overload): 15.0kW (20hp) with 200% overload for 3s, 150% for 57s.
Unfiltered design for cost-effective integration.
External 24V I/O interface: 6 digital inputs, 2 digital outputs, 1 analog input, 1 analog output, 1 motor temperature sensor input.
PROFIBUS-DP fieldbus communication for seamless integration into control systems.
Protection rating: IP20 / UL OPEN TYPE for indoor, protected environments.
High efficiency (η) of 0.97, contributing to energy savings.
Output frequency for vector control: 0-240 Hz; for V/f control: 0-550 Hz.

Technical Specification Matrix

Parameter	Value
Input Voltage	3 AC, 380 - 480 V (+10% / -20%)
Line Frequency	47 - 63 Hz
Rated Current (Low Overload)	48.20 A (Input), 37.00 A (Output)
Rated Power (Low Overload)	18.50 kW (25.00 hp)
Rated Current (High Overload)	45.20 A (Input), 31.00 A (Output)
Rated Power (High Overload)	15.00 kW (20.00 hp)
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
Power Factor λ	0.70 - 0.85
Offset Factor cos φ	0.95
Efficiency η	0.97
Sound Pressure Level (1m)	66 dB
Power Loss	434.0 W
Filter Class (integrated)	Unfiltered
Communication	PROFIBUS DP
Standard Digital Inputs	6 (Switching level 0→1: 11 V, 1→0: 5 V, Max. inrush current: 15 mA)
Fail-safe Digital Inputs	1
Digital Outputs (Relay)	1 (Changeover contact, DC 30 V, 0.5 A resistive load)
Digital Outputs (Transistor)	1 (DC 30 V, 0.5 A resistive load)
Analog / Digital Inputs	1 (Differential, 10 bit resolution; Switching threshold as digital input 0→1: 4 V, 1→0: 1.6 V)
Analog Outputs	1 (Non-isolated)
PTC/KTY Interface	1 motor temperature sensor input
Protection	IP20 / UL OPEN TYPE
Physical Weight (kg)	5.2
Dimensions L x W x H (cm)	27 x 36.5 x 16

Industrial Applications

1. Industrial Pump Control in Water Treatment Facilities

The SINAMICS G120C precisely controls the speed of 18.5 kW pumps in water treatment plants, enabling variable flow rates to match demand and optimize chemical dosing. The PROFIBUS-DP interface allows seamless integration into existing plant control systems, while the IP20 rating mandates installation within a protective control cabinet.

Problem Solved

Prevents water hammering, reduces energy consumption by matching pump output to demand, and provides precise flow control for processes like filtration and chemical mixing.

Variable Speed DrivePump ControlWater TreatmentFlow RegulationEnergy EfficiencyPROFIBUS DPIP20380-480V

2. HVAC Fan Control in Commercial Buildings

This drive is suitable for regulating the speed of 15 kW fans in large commercial HVAC systems. Its ability to vary fan speed based on building occupancy or temperature significantly reduces energy consumption. The integrated Safe Torque Off (STO) function provides a critical safety feature during maintenance or emergency shutdowns.

Problem Solved

Optimizes air circulation and temperature control, reduces energy costs associated with constant-speed fans, and enhances system safety during operation and servicing.

HVACFan ControlEnergy SavingsBuilding AutomationVariable Air Volume (VAV)Safe Torque Off380-480V

3. Conveyor Belt Speed Control in Manufacturing

The SINAMICS G120C can manage the speed of a 15 kW motor driving a conveyor belt in a manufacturing or assembly line. Its high overload capability (200% for 3s, 150% for 57s) effectively handles transient loads during the starting or stopping of heavy items, ensuring smooth material flow. The digital I/O allows for integration with proximity sensors for precise positioning or emergency stops.

Problem Solved

Enables flexible production rates, improves product handling by preventing abrupt starts/stops, and ensures operational safety for personnel and equipment.

Conveyor SystemsMaterial HandlingMotor ControlHigh Overload CapacityDigital I/OProduction Line Automation380-480V

Siemens SINAMICS G120C VFD, 18.5kW, PROFIBUS DP

Siemens SINAMICS G120C VFD, 18.5kW, PROFIBUS DP

Technical Overview

Key Features

Technical Specification Matrix

Industrial Applications

1. Industrial Pump Control in Water Treatment Facilities

2. HVAC Fan Control in Commercial Buildings

3. Conveyor Belt Speed Control in Manufacturing