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The ABB NDCU-21 (63985317B) is a dedicated Drive Control Unit designed for integration within ABB inverter drive systems. This unit serves as the central processing and control interface for managing drive operations, monitoring system status, and executing control logic. Please note that this specific model has been discontinued by the manufacturer.
| Product Model | NDCU-21 63985317B |
| Manufacturer | ABB |
| Control Supply Voltage | 24 V DC |
| Current Draw | 0.7 A (typical) |
| Digital Inputs | 6 x 24 V DC |
| Memory (RAM) | 32 MB SDRAM |
| Memory (Backup) | 512 kB FRAM |
| Isolation Rating | 500 V DC |
| Operating Temperature | -10 degC to +55 degC |
| Storage Temperature | -40 degC to +85 degC |
No, the ABB NDCU-21 63985317B has been discontinued by the manufacturer. It is typically sourced as a spare part for legacy drive systems.
The NDCU-21 acts as the control brain for the inverter drive, handling digital I/O processing and executing the control algorithms required for motor and drive management.