Siemens SINAMICS G120XA 18.5kW Frequency Converter

Technical Overview

18.5 kW 3AC 380-440V VFD for efficient motor control, featuring IP20, Modbus/BACnet/USS, and 110% overload, ideal for pumps, fans, and conveyors.

Key Features

Integrated Fieldbus Communication: Supports USS, Modbus RTU, and BACnet MS/TP protocols.
Robust Design: Features coated modules for enhanced resistance against humidity and dust (Class 3C2).
Wide Operating Temperature: Operates in ambient temperatures from -20 °C to +60 °C (for USS, Modbus RTU, BACnet MS/TP).
Overload Capability: Provides 110% base load current for 60 seconds within a 600-second cycle time.
Comprehensive I/O: Includes 6 standard digital inputs, 4 digital outputs (relay changeover), 2 analog/digital inputs, 2 analog outputs, and 1 motor temperature sensor input (PTC/KTY).

Technical Specification Matrix

Parameter	Value
Input Voltage	3 AC 380-440 V (+10% / -20%)
Input Line Frequency	47-63 Hz
Rated Input Current (LO)	41.00 A
Rated Output Power (LO)	18.50 kW (IEC 400V)
Rated Output Current (IN)	37.00 A (400V)
Max. Output Current	41.00 A
Pulse Frequency	4 kHz
Output Frequency (Vector Control)	0-240 Hz
Output Frequency (V/f Control)	0-550 Hz
Protection Rating	IP20
Efficiency η	0.97
Power Factor λ	0.75-0.93
Sound Pressure Level (1m)	62.2 dB
Power Loss	0.535 kW
Integrated Filter Class	Unfiltered
Digital Inputs (Standard)	6
Digital Output Relays	4 (DC 30V, 1.0A resistive load)
Analog/Digital Inputs	2 (Differential, 12 bit resolution)
Analog Outputs	2 (Non-isolated)
Physical Weight (kg)	17.9
Dimensions L x W x H (cm)	23.9 x 20 x 47.2

Industrial Applications

1. HVAC System Optimization (Pumps & Fans)

This frequency converter is ideal for integrating into HVAC systems to precisely control the speed of 18.5 kW 3-phase motors driving pumps and fans. Its BACnet MS/TP communication protocol facilitates seamless integration with building management systems (BMS), enabling dynamic adjustment of air flow and water circulation based on demand. The IP20 rating requires installation within a protective control cabinet.

Problem Solved

Inefficient operation and high energy consumption of HVAC pumps and fans running at fixed speeds. Lack of granular control over building environmental parameters like pressure, temperature, and air quality.

HVACVariable Speed DrivePump ControlFan ControlBACnet MS/TPEnergy EfficiencyBuilding Management System18.5 kW3-Phase

2. Industrial Water/Wastewater Pumping Stations

The Siemens SINAMICS G120XA can be deployed in industrial pumping stations for water and wastewater treatment, controlling 18.5 kW 3-phase pumps. Its 110% overload capability for 60 seconds handles momentary high demands, while Modbus RTU ensures reliable communication with SCADA systems for centralized monitoring and control. The unit's robustness, with coated modules and a wide operating temperature range (-20 °C to +60 °C), supports continuous operation in typical plant environments, housed in an appropriate enclosure for IP20 protection.

Problem Solved

High wear and tear on pumps and piping due to abrupt starts and stops, energy waste from uncontrolled flow rates, and difficulty in integrating pump operation with plant-wide control systems.

Industrial PumpWater TreatmentWastewater ManagementFlow ControlModbus RTUSCADAOverload Capability18.5 kW3-Phase

3. Variable Speed Conveyor Systems

Suitable for conveyor systems requiring adjustable speeds, this 18.5 kW frequency converter allows for precise control of 3-phase conveyor motors. Its broad output frequency range (0-550 Hz for V/f control) enables flexible adaptation to different production speeds and material handling requirements. Communication via Modbus RTU or USS facilitates integration with programmable logic controllers (PLCs) for synchronized operations in manufacturing or logistics facilities, within an IP20 rated control panel.

Problem Solved

Inflexible production lines unable to adapt conveyor speeds for different products or processes, resulting in bottlenecks or damage to sensitive goods. High energy consumption and mechanical stress from fixed-speed conveyor operations.

Conveyor SystemMaterial HandlingVariable Speed ControlMotor ControlProduction AutomationModbus RTUV/f Control18.5 kW3-Phase