The Siemens 6SE7038-6EK84-1JC2 is a control board (CUVC board) belonging to the Siemens SIMOVERT MASTERDRIVES VC (Variable Speed Control) series. It serves as the core control unit for MASTERDRIVES VC frequency converters, managing drive logic, motor regulation, and external communication. Below are its detailed specifications compiled from legacy technical documentation and industrial automation resources:
- Manufacturer: Siemens AG
- Product Series: SIMOVERT MASTERDRIVES VC
- Product Type: Control Unit (CUVC - Control Unit for Voltage Source Converters)
- Status: Discontinued (Obsolete, legacy component for older MASTERDRIVES VC systems)
- Target Systems: Exclusively compatible with Siemens SIMOVERT MASTERDRIVES VC frequency converters (e.g., 6SE7021-6EC61, 6SE7038-6EK84 series), serving as their central control module.
Control & Regulation Capabilities:
- Motor Control Modes: Supports key control modes for 3-phase AC induction motors, including:
- V/f Control: Basic voltage/frequency ratio control for simple speed regulation (no feedback required).
- Sensorless Vector Control: Advanced mode for precise speed control (speed accuracy: ±0.5% of rated speed) without a motor encoder.
- Closed-Loop Vector Control: Requires external encoder feedback (e.g., SIN/COS encoder, resolver) for high-precision speed/torque control (speed accuracy: ±0.01% of rated speed).
- Regulation Loops: Integrates dual closed-loop regulation (current loop and speed/torque loop) with proportional-integral-derivative (PID) controllers for stable dynamic performance.
Input/Output (I/O) Interfaces:
- Analog Inputs: 4 x 10-bit analog inputs (0-10 V DC or 4-20 mA DC) for speed references, torque setpoints, or process signals.
- Analog Outputs: 2 x 10-bit analog outputs (0-10 V DC or 4-20 mA DC) for real-time feedback (e.g., motor speed, output current).
- Digital Inputs: 8 x optically isolated digital inputs (24 V DC) for control commands (start/stop, direction, enable).
- Digital Outputs: 4 x relay digital outputs (250 V AC/30 V DC, 5 A) for status feedback (e.g., drive running, fault alert).
Communication Interfaces:
- Standard Interface: Integrated RS485 serial port for local parameterization via Siemens DriveMonitor software (using STARTER or DriveES tools).
- Optional Fieldbus Support: Features a dedicated slot for communication option modules (e.g., PROFIBUS DP, DeviceNet, Modbus RTU) to integrate with upper-level control systems (e.g., SIMATIC S7 PLCs). Common option modules include 6SE7090-0XX84-0AB0 (PROFIBUS DP).
- Power Supply: Draws power from the MASTERDRIVES VC converter’s internal control voltage rail.
- Input Voltage: 24 V DC ±10% (derived from the converter’s auxiliary power supply).
- Power Consumption: < 15 W (low-power design to avoid overloading the converter’s internal circuits).
- Electrical Isolation: Galvanic isolation between the control board, power electronics, and external I/O (isolation voltage: 2.5 kV AC for 1 minute) to prevent electromagnetic interference (EMI).
- Dimensions: Approx. 180 mm (Width) × 120 mm (Height) × 40 mm (Depth) (compact form factor for installation in the MASTERDRIVES VC converter’s control compartment).
- Weight: Approximately 0.8 kg.
- Mounting: Plug-in installation into the dedicated control board slot of the MASTERDRIVES VC converter (no additional mounting hardware required; secured via a locking latch).
- Protection Class: IP20 (dust-protected, suitable for indoor industrial environments when installed within the converter’s cabinet).
- Operating Temperature Range: 0°C to +40°C (same as the host MASTERDRIVES VC converter’s operating temperature).
- Storage Temperature Range: -20°C to +70°C.
- Relative Humidity: 5% - 95% (non-condensing).
- Configuration Software: Configured and commissioned using Siemens DriveMonitor (legacy software) or STARTER (compatible with older versions) via the RS485 interface or a communication option module.
- Parameter Storage: Non-volatile EEPROM memory for storing drive parameters (retains settings even when power is disconnected). Supports parameter backup/restore to a PC for system replication or maintenance.
- Firmware: Pre-installed with MASTERDRIVES VC control firmware (typical version: V5.1 or later). Firmware updates are no longer provided by Siemens as the product is obsolete.
- Critical Role: As the "brain" of the MASTERDRIVES VC converter, this board is essential for drive operation—any failure typically requires replacement to restore functionality.
- Replacement Options: Since it is discontinued, Siemens recommends upgrading the entire MASTERDRIVES VC system to the modern SINAMICS S120 series. For legacy system maintenance, refurbished 6SE7038-6EK84-1JC2 boards are available through specialized industrial resellers.
- Compatibility Check: Must be matched to the host MASTERDRIVES VC converter’s frame size and firmware version to ensure proper communication and control. Mismatched firmware may cause drive faults or unstable operation.
The 6SE7038-6EK84-1JC2 is no longer manufactured by Siemens. It is primarily sourced from resellers of refurbished industrial automation parts or surplus stock. Users should verify the board’s functional status (e.g., through testing) and compatibility with their specific MASTERDRIVES VC converter model before purchase.
