Siemens SINAMICS G120C 5.5kW PROFINET Frequency Converter

Technical Overview

5.5kW compact frequency converter for 380-480V 3AC motor control. Features PROFINET/EtherNet/IP, sensorless vector control, and IP20 protection.

Key Features

Dual network communication via PROFINET and EtherNet/IP.
Integrated fail-safe digital input supports safety-related stop functions without an external safety relay.
Sensorless vector control and V/f ECO modes for optimized energy utilization across diverse load profiles.
Compact design, frame size FSB, suitable for control cabinet mounting.
Supports both Low Overload (LO) at 5.50 kW and High Overload (HO) at 4.00 kW for varied applications.
IP20 / UL open type degree of protection.

Technical Specification Matrix

Parameter	Value
Manufacturer	Siemens
Product line	SINAMICS G120C
Input Phases	3 AC
Input Line Voltage	380-480 V (+10% / -20%)
Input Line Frequency	47-63 Hz
Input Rated Current (LO)	16.50 A
Input Rated Current (HO)	12.80 A
Output Rated Power (LO)	5.50 kW / 7.50 hp
Output Rated Power (HO)	4.00 kW / 5.00 hp
Output Rated Current (LO)	12.50 A
Output Rated Current (HO)	8.80 A
Rated Output Current (IN)	13.00 A
Max. Output Current	17.60 A
Output Frequency (Vector Control)	0-240 Hz
Output Frequency (V/f Control)	0-550 Hz
Pulse Frequency	4 kHz
Overload Capability (LO)	150% for 3s, then 110% for 57s per 300s cycle
Overload Capability (HO)	200% for 3s, then 150% for 57s per 300s cycle
Communication Interfaces	PROFINET, EtherNet/IP
Standard Digital Inputs	6
Fail-safe Digital Inputs	1
Digital Outputs (Relay Changeover)	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 Input	PTC, KTY, Thermo-Click (accuracy ±5°C)
Efficiency	0.97, efficiency class IE2
Power Loss	169.0 W
Filter Class	Unfiltered
Cooling	Integrated fan, air cooled
Degree of Protection	IP20 / UL open type
Frame Size	FSB
Ambient Temperature (Operation)	-10 to 40°C
Installation Altitude	up to 1,000 m
Standards	CE, cUL, UL, KC, EAC, C-Tick (RCM)
Physical Weight (kg)	2.7
Dimensions L x W x H (cm)	26 x 25.5 x 12.5

Industrial Applications

1. Industrial Pump Control for Water Treatment Facilities

This frequency converter is ideal for controlling medium-sized industrial pumps in water treatment plants. Its 5.5 kW (LO) output power and 380-480V input voltage precisely match common pump requirements. The variable speed control (0-550 Hz V/f control) allows for accurate flow rate regulation, optimizing processes and reducing energy consumption. Its IP20 rating requires cabinet installation, a standard practice in these facilities, and PROFINET/EtherNet/IP ensure seamless integration into SCADA systems for real-time monitoring. The integrated Safe Torque Off (STO) function provides critical safety during maintenance procedures.

Problem Solved

Provides efficient and precise control of pump flow rates, leading to significant energy savings and enhanced operational safety within network-integrated industrial water treatment environments.

Variable Frequency DrivePump ControlEnergy EfficiencyPROFINETIP20Safe Torque Off3-phase AC5.5 kWWater Treatment

2. Conveyor System Motor Control in Manufacturing Automation

The Siemens 6SL3210-1KE21-3UF1 is perfectly suited for managing motor operations in manufacturing conveyor systems. Its dual overload capability (150% for LO and 200% for HO) effectively handles both steady transport loads and peak demands during acceleration or deceleration. The 0-240 Hz vector control ensures precise speed and torque regulation, facilitating smooth starts and stops, preventing material slippage, and improving product handling. Its compact dimensions (100 x 196 x 203 mm) allow for efficient integration into existing control cabinets on production lines.

Problem Solved

Achieves precise speed and torque management for conveyor belts, resulting in improved material flow, reduced mechanical wear, and efficient, compact integration into automated production setups.

Conveyor SystemsVector ControlOverload CapabilityCompact DesignMotor ControlManufacturing Automation3-phase AC

3. Fan Control in HVAC Systems for Industrial Buildings

This frequency converter is ideal for controlling industrial fans within large-scale HVAC systems, enabling advanced Variable Air Volume (VAV) applications. With output power ratings of 4.0 kW (HO) and 5.5 kW (LO), it efficiently drives various fan sizes. The wide V/f control frequency range of 0-550 Hz allows for precise, demand-driven adjustment of fan speeds, significantly reducing energy consumption. Its -10 to 40°C operating ambient temperature range and integrated fan cooling ensure reliable performance in industrial environments. PROFINET/EtherNet/IP connectivity enables seamless integration with Building Management Systems (BMS) for centralized control.

Problem Solved

Provides energy-efficient and highly responsive control of industrial fans in HVAC systems, thereby lowering operational costs and maintaining optimal air quality and temperature conditions in industrial facilities.

HVAC SystemsFan ControlV/f ControlEnergy SavingsPROFINETBuilding Management SystemVariable Air Volume3-phase AC