Description
The 6DD1683-0CD5, also known as the Siemens SIMADYN D SP23.5 Power Supply Unit, is a dedicated rack-mount PSU designed for the SIMADYN D 19″ drive and control system architecture. This module serves as the primary power source for the entire SIMADYN D backplane, converting universal AC mains into the stable DC rails required by processor modules (PM4/PM5/PM6), I/O interface modules, and communication boards.
Engineered for maximum reliability in demanding industrial environments, the 6DD1683-0CD5 delivers high-current 5V logic power (25A) alongside 15V analog rails for the front-end circuitry. The “.5” suffix denotes an integrated forced-air fan for active cooling, distinguishing it from fanless variants like the SP23 (6DD1683-0CD0). Please note that this product has been officially discontinued by Siemens (“Product deleted without replacement” effective October 1, 2017) and is now available only as a tested refurbished or new-old-stock spare part for legacy system maintenance.
Application Scenarios
In a hot-strip steel rolling mill, the existing SIMADYN D control cabinet experienced a sudden power supply failure on the 5V logic rail, causing a complete processor shutdown and halting the entire production line. The maintenance team replaced the failed unit with a refurbished 6DD1683-0CD5, restoring power to the PM4 CPU, TEB trigger boards, and all I/O modules within minutes, thereby preventing an estimated 8 hours of unplanned downtime.
A critical pain point the 6DD1683-0CD5 addresses is the vulnerability of legacy SIMADYN D systems to power supply aging. Capacitor degradation and fan bearing wear are common failure modes in these units after years of continuous 24/7 operation. The 6DD1683-0CD5 directly resolves this by providing a tested, reliable replacement that matches the original form factor and electrical specifications. It plugs directly into the dedicated PSU slot (left-most or right-most position) of SR12.x subracks, restoring the entire system to operational status without any rewiring or cabinet modifications.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6DD1683-0CD5 (SIMADYN D SP23.5) |
| Manufacturer | Siemens (SIMADYN D Series) |
| Product Category | Power Supply Unit – Rack-mount for SIMADYN D systems |
| Variant | SP23.5 (SP23 with integrated cooling fan) |
| Input Voltage | 115 / 230 V AC (selectable) |
| Output 1 (Logic) | 5 V DC @ 25 A – Main power for CPU and I/O backplane |
| Output 2 (Analog) | 15 V DC – Analog front-end and reference supply |
| Cooling | Forced-air fan (integrated) |
| Mounting | 19″ SIMADYN D rack, dedicated PSU slot |
| Dimensions | Approx. 340 × 250 × 130 mm (19″ rack form factor) |
| Weight | Approx. 4.28 kg (net) |
| Lifecycle | PM500 – Discontinued without replacement (2017-10-01) |
| Compatibility | SR12.4 subrack; PM4/PM5/PM6, TEB, IT41/IT42, SE20 modules |
Technical Principles and Innovative Values
The 6DD1683-0CD5 operates as a dedicated power conversion and distribution hub within the SIMADYN D rack. It takes a universal 115/230V AC mains input (configurable via internal strapping) and converts it into the three critical DC voltage rails required by the SIMADYN D backplane: a high-current 5V rail (25A) for digital logic and processor power, and a 15V rail for analog signal conditioning and reference circuitry. The integrated fan ensures forced-air cooling to dissipate the significant heat generated by the high 25A output under full load, enabling continuous operation in high-ambient-temperature industrial environments.
Innovation Point 1: Universal AC Input and High Current Capacity
Unlike many industrial power supplies that are limited to a single voltage input, the 6DD1683-0CD5 supports a universal 115V or 230V AC input, making it adaptable to electrical infrastructures worldwide. Its 5V rail is rated for an impressive 25A, providing substantial power headroom to supply an entire fully-populated SIMADYN D rack with multiple processor and I/O modules. This high-current capability ensures stable, sag-free operation even during peak load conditions typical in high-speed motion control and drive applications.
Innovation Point 2: Integrated Forced-Air Cooling
The “.5” suffix in “SP23.5” designates the inclusion of an active cooling fan, which is a critical differentiator in the SP2x power supply family. The fan is necessary for managing the thermal load generated by the 125W dissipation on the 5V rail alone. This forced-air cooling allows the 6DD1683-0CD5 to operate reliably in densely packed 19″ cabinets where natural convection is insufficient. The fan-cooled design extends the operational lifespan of both the power supply itself and the surrounding modules by maintaining a lower ambient temperature within the rack.
Innovation Point 3: Seamless Backplane Integration
The 6DD1683-0CD5 is not a standalone unit; it is fully integrated with the SIMADYN D subrack architecture. It connects to the backplane via dedicated power busbars, distributing power directly to the PM baseboard power header. This design eliminates the need for external wiring harnesses to supply power to individual modules, significantly simplifying cabinet wiring, improving reliability, and making the system cleaner and easier to maintain
