Siemens 6RY1703-0AA00 SIMOREG DC-MASTER CUD1 Control Board

Key parameters and features

Core Features & Advantages

• Central Intelligence of the 6RA70 Drive: The module's standout feature is its role as the primary control processor for the SIMOREG DC-MASTER platform. Two microprocessors on the CUD1 execute all closed-loop control functions, making it the only board in the drive that stores the complete parameter set . This centralized architecture means that when a CUD1 is replaced, the drive's configuration must be re-entered from a documented backup .

• L1 Designation for Legacy Drive Compatibility: The L1 version (C98043-A7001-L1) is specifically designed for 6RA70 drives in Production States A1 and A2 . This hardware version only supports software versions 1.xx and 2.xx . This is a critical compatibility constraint—installing a different L-series board (such as the L2 variant for software 3.xx) or attempting to load incorrect software will cause the drive to fail initialization .

• Critical Spare Part for Legacy Systems: As an officially discontinued product, this board is classified as a spare part for the maintenance and repair of existing 6RA70 systems rather than for new projects . Its value lies in supporting the continued operation of installed industrial assets where replacement with modern equipment is not immediately feasible.

• Parameter Storage and Maintenance Considerations: The CUD1 stores all drive parameters in its onboard EEPROM . A parameter backup via Siemens' DriveMonitor PC tool is essential before any CUD1 replacement . Without a documented backup, the drive requires full recommissioning—motor data re-entry, regulator auto-tuning, I/O reconfiguration, and verification of all protection settings—which can mean extended downtime in a production environment .

Typical Applications

The 6RY1703-0AA00 is utilized as a core control component in Siemens SIMOREG 6RA70 drive systems across various heavy industrial sectors :

• Metals & Mining: Steel rolling mills, mine winders, and crane hoists.

• Paper & Pulp: Paper and board machines requiring precise tension and speed control.

• Plastics & Extrusion: Plastics extruders and compounding lines.

• General Heavy Industry: Large conveyors, test stands, and any application requiring precise DC motor speed and torque regulation .

Q1: What is the primary function of the 6RY1703-0AA00?

A: It is the CUD1 (Control Unit Digital 1) main control board for the Siemens SIMOREG DC-MASTER 6RA70 DC drive. It executes the drive's closed-loop control functions (armature current, speed, field weakening), stores the complete parameter set, and manages communication with external systems .

Q2: What is the difference between 6RY1703-0AA00 and 6RY1703-0AA01?

A: The 6RY1703-0AA00 is the market order number for the L1 version (C98043-A7001-L1), which supports software versions 1.xx and 2.xx and is compatible with 6RA70 drives in Production States A1 and A2 . The 6RY1703-0AA01 is the order number for the L2 version (C98043-A7001-L2), which supports software version 3.xx and is used in later Production State A3 drives . They are not interchangeable .

Q3: Is the 6RY1703-0AA00 still in production?

A: No. This product has been discontinued by Siemens as of August 1, 2007, and is classified as a spare part for legacy system maintenance . Availability is through the surplus or refurbished market.

Q4: Can a C98043-A7001-L2 board replace the L1 board?

A: No. The L2 board is designed for Production State A3 drives and requires software version 3.xx. Installing L2 hardware with L1-compatible software in an A1/A2 drive will result in an incompatible combination—the drive will not initialize correctly .

Q5: What happens if I replace the CUD1 board without a parameter backup?

A: The CUD1 is the only board in the 6RA70 that stores the drive's parameters . If you replace it without a documented backup via DriveMonitor, the drive will require full recommissioning: motor data re-entry, regulator auto-tuning, I/O reconfiguration, and verification of all protection settings. This can result in extended downtime .

Q6: What does the error code F063 indicate?

A: F063 and F064 at power-up indicate an internal memory fault on the CUD1. These faults originate on the board itself. If the fault persists after a power cycle, the CUD1 has failed and requires replacement .