Siemens 6SL3244-0BA20-1BA0 SINAMICS G120 CU240S Control Unit

Overview

SIEMENS SINAMICS G120 CU240S

6SL3244-0BA20-1BA0 SINAMICS G120 CU240S Control Unit

Control a modular G120 inverter through local terminals or USS on RS485, with analog setpoints, motor-temperature monitoring and an encoder interface.

At a Glance

Brand	Siemens
Model	6SL3244-0BA20-1BA0
Product Type	Motor drive control unit
Core Function	Regulate speed with optional encoder feedback
Application	Modular SINAMICS G120 drives

Terminal and serial commands

Local digital signals and USS on RS485 provide command and setpoint paths.

Encoder-capable control

The standard CU240S supports closed-loop control with encoder feedback.

Parameter transfer tools

BOP, STARTER and an MMC support commissioning and backup workflows.

Product Overview

6SL3244-0BA20-1BA0 is the standard CU240S control unit used with a separate power module in the SINAMICS G120 modular drive system. It combines programmable terminal I/O, serial communication and an encoder connection for motor-control applications.

The control functions include V/f and vector methods, programmable fixed frequencies and skip frequencies, while the MMC provides a portable store for parameter sets during series commissioning and replacement.

Ordering focus: Match the standard CU240S terminal and encoder arrangement to the installed drive and select the power module and commissioning accessories separately.

Key Functions

Apply open-loop or feedback control

V/f control and vector control provide operating choices for motor speed and torque, including control with encoder feedback.

Select commands from terminal or USS sources

Programmable inputs and analog channels support local machine signals, while the RS485 interface carries USS commands and process data.

Reuse commissioned parameter sets

An MMC stores up to 100 parameter sets and supports transfer to another control unit for repeated commissioning.

Official Specifications

Control Supply	24 V DC from the power module or an external supply
External Supply Operating Range	20.4 to 28.8 V DC; 0.5 A
Programmable Digital Inputs	9 isolated PNP inputs; low below 5 V, high above 10 V
Maximum Digital Input Voltage	30 V
Analog Input Channels	2 programmable inputs, also configurable as additional digital inputs
Analog Input Ranges	AI0: 0 to 10 V, −10 to +10 V or 0 to 20 mA; AI1: 0 to 10 V or 0 to 20 mA
Programmable Relay Outputs	3; up to 30 V DC and 0.5 A with resistive loads
Analog Output Ranges	AO0: 0 to 10 V or 0 to 20 mA; AO1: 0 to 20 mA
Serial Communication	USS over RS485
V/f Output Frequency Range	0 to 650 Hz
Vector-Control Output Frequency Range	0 to 200 Hz
Frequency Presets	16 programmable fixed frequencies and 4 skip frequencies
Setpoint Resolution	0.01 Hz digital and serial; 10-bit analog
MMC Parameter Storage	Up to 100 parameter sets
Dimensions	73 × 178 × 55 mm (W × H × D)
Approximate Mass	0.52 kg

Official source:Siemens product manual and technical specifications

Frequently Asked Questions

Which serial protocol can I use to command 6SL3244-0BA20-1BA0 through its RS485 terminals?

The standard control unit supports USS communication over RS485.

Does 6SL3244-0BA20-1BA0 support Encoder-capable control for mobile equipment?

Yes, the standard CU240S supports speed and torque control with encoder feedback.

How can I reproduce the settings of 6SL3244-0BA20-1BA0 on another drive?

Store the commissioned parameter set on an MMC and transfer it to the replacement control unit.

Must an MMC remain installed for 6SL3244-0BA20-1BA0 to run?

No, the inverter can operate with or without an MMC fitted.

Can I enter a bipolar analog setpoint on 6SL3244-0BA20-1BA0?

Analog input AI0 accepts a −10 to +10 V signal in addition to its unipolar voltage and current ranges.

How can I avoid a resonance speed when configuring 6SL3244-0BA20-1BA0?

Use the four programmable skip frequencies to exclude the relevant operating-frequency bands.

What should I use to commission 6SL3244-0BA20-1BA0 from a PC?

Use STARTER with the PC connection kit through the option port.

Compatibility & Ordering Notes

Before ordering 6SL3244-0BA20-1BA0: Select the standard CU240S configuration for USS and terminal operation, then match the encoder, power module and saved parameter set to the existing motor drive.

Compatibility Checklist for 6SL3244-0BA20-1BA0

• Keep the CU240S communication variant consistent with the installed automation interface.
• Match the motor data and selected control method during commissioning.
• Set the analog-input DIP switches and parameters for voltage or current signals.
• Retain a backup parameter set before exchanging the control unit.

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