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3. Key Technical Specifications
The Woodward 5503-282 Power Supply Module provides clean, regulated, isolated direct current across the MicroNet backplane to power processing cores, communication cards, and field interface modules.
| Parameter | Value |
| Part Number | 5503-282 |
| Manufacturer | Woodward |
| System Compatibility | MicroNet Simplex, Dual, and TMR Systems |
| Input Voltage | 18 to 32 VDC (Nominal 24 VDC) |
| Efficiency | > 80% at full rated load |
| Protection Features | Overvoltage, overcurrent, and short-circuit auto-recovery |
| Redundancy | Diode-ORed internal outputs for parallel load sharing |
| Status Indicators | Front-panel Power OK (Green) and Fault (Red) LEDs |
| Operating Temperature | -40°C to +70°C |
| Mounting | Slide-in chassis bay with VME backplane mating connectors |
4. Product Introduction & Supply Chain Strategy
The Woodward 5503-282 is a heavy-duty power supply module built specifically for Woodward MicroNet digital control chassis. It delivers continuous, ripple-free logic power to CPU and I/O boards, maintaining operational stability even during severe plant voltage sags or electrical noise events on the main supply lines.
Holding a 5503-282 as a New Surplus spare is a vital asset preservation tactic. Power supply modules endure continuous thermal and electrical strain, making them one of the highest wear-and-tear components in any digital control system. A sudden power supply failure in a non-redundant rack triggers a instant system crash and un-sequenced turbine trip. Procurement of an uninstalled, original New Surplus 5503-282 provides immediate drop-in replacement capability, avoiding the long lead times of factory orders and avoiding the rapid capacitor failure associated with used or refurbished power supplies.
5503-282
5503-282
5. Installation & Configuration Guide
Critical Electrical Warning
Power supply modules handle high current levels on internal DC rails. Never insert or remove a power supply module with the primary supply feed energized unless the MicroNet rack is confirmed to have an active, fully redundant parallel power module online.
1.Safety Inspection & Power Isolation:Prerequisite.
Disconnect and tag out (LOTO) incoming primary DC power feeds to the targeted supply bay if working on a Simplex rack. Put on a grounded ESD wrist strap before handling replacement power hardware.
2.Module Extraction:Removal.
Loosen the top and bottom captive mounting screws on the faceplate of the failed 5503-282 module. Pull the card ejector handles outward to unseat the module from the high-current backplane pins, then pull the unit straight out of the chassis guide slots.
3.Replacement Installation:Insertion.
Inspect the backplane connector pins on the replacement 5503-282 card for alignment and cleanliness. Slide the unit along the chassis card guides until the ejector levers contact the rack frame. Seat the module firmly and lock top and bottom retaining screws to establish chassis frame ground.
4.Power-On & Rail Verification:Commissioning.
Re-apply primary DC power to the module. Observe that the front-panel Power OK LED turns green and the FAULT LED remains off. Measure backplane test points or check system diagnostics in Woodward AppManager to confirm stable voltage levels.
6. Firmware/Software Versions & Upgrade Notes
- Software Compatibility: The 5503-282 is a purely hardware-based power conversion module and contains no programmable application firmware.
- Redundancy Configuration: When used in redundant dual-power configurations, ensure both power supply modules are receiving balanced input supply voltages within the 18 to 32 VDC operating range.
- Load Sharing: Internal diode-ORing circuits allow parallel load sharing; no software setup or manual jumper balancing is required upon replacement.
- Thermal Precaution: Ensure cabinet cooling fans are fully functional. Operating power supply modules in unventilated enclosures above 70°C will drastically reduce the service life of internal smoothing capacitors.
7. Frequently Asked Questions (FAQ)
Q: Is this Woodward 5503-282 module genuinely new, or is it pulled from an active panel?
A: This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability.
Q: Why should I choose New Surplus instead of a cheaper refurbished power supply?
A: Power supply units rely on electrolytic capacitors that degrade with age and heat even when idle. Refurbished power supplies often reuse aged capacitors that are prone to ripple noise and sudden failure. New Surplus units guarantee fresh internal components, original dielectric strength, and full operating life.
Q: Can I hot-swap this 5503-282 power supply in a redundant MicroNet chassis?
A: Yes, if your MicroNet chassis is equipped with dual power supply bays and the second module is healthy and sharing the load, the failed 5503-282 can be safely hot-swapped without shutting down system CPU or I/O operations.
Q: What indicates that a 5503-282 module needs replacement before it fails completely?
A: Key early warnings include a flickering green Power OK LED, excessive heat generation, minor DC voltage fluctuations logged in AppManager diagnostic logs, or a persistent red FAULT LED indication.
Q: What warranty and quality assurance documentation come with this unit?
A: Every 5503-282 power supply is packaged in static-shielding protective material, includes a comprehensive QC verification report, and carries a 1-year full replacement warranty from the date of delivery.
