Control Unit | 6SL3243-0BB30-1PA3 Siemens

SINAMICS CU230P-2 DP Control Unit – Product Introduction

The SINAMICS CU230P-2 DP (Article No. 6SL3243-0BB30-1PA3) is a versatile control unit for the SINAMICS G120 drive family. This unit communicates via PROFIBUS DP, making it ideal for networked industrial automation systems. It supports multiple control techniques, including V/f linear, V/f ECO, and sensorless vector control. Therefore, you can use it for various motor applications, from basic pumps to complex conveyor systems.

Key Electrical Specifications

This control unit operates from two power sources. First, it can draw power directly from the connected Power Module at DC 24 V. Alternatively, you can supply it via an external DC source ranging from 20 V to 29 V. The maximum current consumption is only 0.50 A, and the typical power loss is 5.50 W. Consequently, this unit runs efficiently without generating excessive heat. Additionally, the unit supports a wide operating temperature range from -10 °C to 60 °C (14 °F to 140 °F), ensuring reliable performance in most industrial environments.

Communication and Connectivity

Communication relies on the PROFIBUS DP interface, which allows seamless integration into higher-level PLC-based control networks. Moreover, the unit provides extensive I/O capabilities for flexible machine interfacing. Specifically, you get six standard digital inputs with clearly defined switching levels: 0→1 at 11 V and 1→0 at 5 V. Furthermore, the CU230P-2 DP includes three relay outputs. Two of these outputs function as changeover relays, supporting inductive loads up to DC 250 V, 2 A or resistive loads up to DC 30 V, 0.5 A. The third output is a normally-open contact rated for DC 30 V, 0.5 A (resistive).

In addition to digital I/O, this unit provides two analog/digital differential inputs and two non-isolated analog outputs. These analog channels enable you to connect external sensors or transmitters for process feedback, such as pressure or flow signals. Meanwhile, the fail-safe digital inputs are not available (0 inputs), so this unit is intended for standard safety applications only.

Control Techniques and Performance

The CU230P-2 DP supports a broad range of closed-loop control methods, giving you the flexibility to match the drive to your specific load characteristics. For simple applications, select the V/f linear or square-law characteristic, which is common for pumps and fans. You can also enable the V/f with flux current control (FCC) for improved dynamic response. Additionally, the V/f ECO linear and square-law modes help reduce energy consumption in variable-torque loads.

For more demanding applications, the unit offers sensorless vector control and encoderless torque control. These methods provide high torque accuracy and fast speed response without requiring an encoder feedback device. However, this particular model does not support vector control with a sensor or torque control with an encoder. Therefore, if your application needs precise position or torque control at zero speed, consider other CU models with encoder interfaces.

Mechanical and Environmental Data

The control unit has a compact footprint, measuring only 73.0 mm wide, 199.0 mm high, and 65.5 mm deep. Its lightweight design (0.61 kg net) simplifies mounting inside control cabinets. Furthermore, the unit carries an IP20 degree of protection (UL open type), so you must install it in a clean, dry enclosure. The permissible relative humidity during operation is up to 95% (non-condensing). For storage, the unit withstands temperatures from -40 °C to 70 °C (-40 °F to 158 °F).

All signal cables should have a conductor cross-section between 0.15 mm² and 1.50 mm² (AWG 24 to AWG 16). Finally, this product complies with major international standards, including CE, UL, cUL, RCM, and SEMI F47. The CE marking confirms conformity with the Low-voltage Directive 2014/35/EC.

Installation Guidelines

Mount the CU230P-2 DP directly on the Power Module using the built-in snap-on mechanism. Ensure proper grounding and shielding for all signal cables to avoid electromagnetic interference. Also, leave sufficient clearance around the unit for airflow, as passive cooling relies on natural convection. For PROFIBUS DP wiring, use a certified bus cable and terminate the bus line correctly at both ends. Finally, connect the external 24 V DC supply only after verifying the voltage stability within the specified range (20–29 V).

Packaging List

• SINAMICS CU230P-2 DP control unit (6SL3243-0BB30-1PA3) × 1

• Terminal block set for I/O connections × 1

• PROFIBUS DP interface connector (9-pin D-sub) × 1

• Mounting clip and grounding bracket × 1

• Multilingual quick start guide (paper) × 1

Shipping methods: FedEx, UPS, DHL

FAQ

1. Can I use this control unit with a 400 V AC Power Module?
Yes, the CU230P-2 DP works with all SINAMICS G120 Power Modules regardless of their input voltage. The control unit itself only requires a 24 V DC supply, which you can source from the Power Module or an external power supply.

2. Does this unit support Ethernet-based communication like PROFINET?
No, this specific model supports only PROFIBUS DP. For PROFINET connectivity, you would need a different control unit, such as the CU240E-2 PN or CU250S-2 PN.

3. How many analog inputs can I use simultaneously?
You have two differential analog/digital inputs. You can configure each channel independently as either an analog input (e.g., 0–10 V or 4–20 mA) or as an additional digital input. Meanwhile, the two analog outputs are always available for signal feedback.

4. Is the CU230P-2 DP suitable for hoisting or crane applications?
Not recommended. Since this unit lacks encoder support and fail-safe digital inputs, it cannot provide the precise torque control or safety functions required for lifting gear. Instead, consider a CU250S-2 with encoder and safety options.

5. What happens if the external 24 V supply drops below 20 V?
The unit may reboot or enter a fault state, causing the motor to coast to a stop. Therefore, you must use a stabilized power supply with sufficient capacity and voltage monitoring to ensure reliable operation.