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| Place of Origin | Germany |
| Brand Name | SIEMENS |
| Certification | CE ROHS |
| Model Number | C98043-A7001-L1 6RY1703-0AA00 |
The CUD1 is the central control board of the SIMOREG DC-MASTER 6RA70 — the board that runs all closed-loop control (armature current, field current, speed), manages the parameter database, executes the firing pulse algorithms for the power thyristors, and handles all communication with operator panels and external control systems. Every drive function — setpoint processing, ramp functions, diagnostics, fault management — is executed by this board.
The 6RA70 series covers DC drives from 6 kW to 2500 kW across heavy industry: steel rolling mills, paper machines, plastics extruders, large cranes and hoists, mine winders, and any process where a DC motor's torque characteristics make it preferable to an AC drive.
The CUD1 connects to the rest of the drive hardware through the electronics box backplane. Optional communication boards (PROFIBUS CBP2, DeviceNet CBD, CAN Bus CBC) plug into the backplane and are managed through the CUD1. USS serial communication for DriveMonitor access is built in.
| Parameter | Value |
|---|---|
| Cross-Reference | C98043-A7001-L1 |
| Compatible Drive | SIMOREG DC-MASTER 6RA70 |
| Firmware | 1.x, 2.x (L1 only) |
| Terminals | Included |
| Origin | Austria |
| Successor | 6RY1703-0AA01 (L2) |
This is the most critical ordering decision for a 6RA70 CUD1 replacement:
| Board | Part Number | Firmware |
|---|---|---|
| L1 | 6RY1703-0AA00 (this board) | 1.x and 2.x only |
| L2 | 6RY1703-0AA01 | 3.x only |
Firmware 3.x cannot be loaded onto an L1 board. If the installed drive has been upgraded to firmware 3.x, the L2 board (6RY1703-0AA01) is required — fitting an L1 board means the drive cannot run firmware 3.x without a firmware downgrade and associated parameter restructuring.
Confirm the installed firmware version from the drive's PMU display (parameter P079 or equivalent) before ordering. If the drive is running firmware 1.x or 2.x — which covers all 6RA70 drives that have not been explicitly updated to 3.x — the 6RY1703-0AA00 is the correct replacement.
The 6RA70 parameter set is stored in EEPROM on the CUD1 board. When the board is replaced, the replacement arrives with factory defaults — machine-specific tuning built up over commissioning is not present. However, the backplane stores the drive's identity data (serial number, model number, Technology PIN) and is retained through the swap. This means the Technology option (S00) continues to function after CUD1 replacement, provided the backplane is unchanged.
Maintain a current parameter backup via the OP1S operator panel or DriveMonitor PC software through the USS interface. With a backup, CUD1 replacement is a straightforward maintenance event. Without a backup, recommissioning from scratch requires the original commissioning documentation and specialist knowledge.
Q1: The drive is running firmware 2.x. Can the L2 board (6RY1703-0AA01) be used as a drop-in replacement?
No. The L2 board supports only firmware 3.x. Installing an L2 board on a drive running 2.x requires a firmware upgrade to 3.x, which also changes parameter structures — the existing parameter set may not transfer cleanly. For a like-for-like replacement on a firmware 2.x drive, the L1 board (6RY1703-0AA00) is the correct choice.
Q2: Will removing the failed CUD1 lose the drive's parameters?
Yes — the EEPROM storing the parameters is on the board being removed. If a backup was taken via OP1S or DriveMonitor before the failure, parameters are restored to the replacement board after installation. Without a backup, parameters must be re-entered from commissioning documentation. Maintaining a current backup is the most important preventive maintenance step for any 6RA70 installation.
Q3: Is the Technology PIN (S00 option) affected by CUD1 replacement?
No, provided the backplane is not changed. The Technology PIN is stored in a socket on the backplane, not on the CUD1 board. The replacement CUD1 installed into the original backplane continues to access the PIN normally after parameter restoration.
Q4: Can a surplus 6RY1703-0AA00 be used reliably in production?
Yes, when sourced from a supplier who has functionally tested — not just visually inspected — the board, and who can confirm the firmware version loaded. Request ESD-protective packaging and a warranty period of 12–24 months. Avoid boards offered without testing confirmation.
Q5: Can the CUD1 be repaired rather than replaced?
Board-level repair is offered by specialist industrial electronics companies. Common repair items include capacitor replacement, EEPROM re-programming, and power regulation circuit repair. Repair turnaround is typically 5–10 business days. For drives managing critical production processes, holding an exchange board in stock is preferable to relying on repair turnaround.
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