Description
Hard-Numbers: Technical Specifications
- Part Number: 5503-267
- Input Voltage: 115 VAC or 230 VAC (Selectable via rear switch or jumper)
- Output Voltage: 24 VDC
- Rated Output Current: 6 Amps (144 Watts total power)
- Input Frequency: 47–63 Hz
- Isolation Voltage: 1500 VAC (Input to Output)
- Operating Temperature: -25°C to +70°C
- Cooling Method: Internal forced-air cooling (integral 12V DC fan)
- Mounting: DIN Rail or Card Guide Mounting
5464-334
The Real-World Problem It Solves
In a control cabinet, you rarely have clean, regulated 24VDC readily available for your sensitive electronics. The 5503-267 takes dirty, fluctuating plant AC power and converts it into a stable 24VDC rail, isolating your control system from mains-borne electrical noise and brownouts.
Where you’ll typically find it:
- Bolted into the top slot of a vintage 5000-series turbine control panel, supplying the backbone power for the CPU and analog input cards.
- Mounted on the DIN rail of a generator paralleling switchgear panel, providing localized 24VDC for the DSLC controllers and their associated relays.
- Retrofitted into older Woodward 5000 rack enclosures to replace failing linear power supplies, significantly reducing internal heat generation.
It acts as the heart of the control panel, pumping clean DC current to the rest of the I/O.
Hardware Architecture & Under-the-Hood Logic
This module is a robust, industrial-grade switched-mode power supply. It is designed to handle significant load transients from inductive loads like solenoids or contactor coils without collapsing the 24VDC bus.
- AC Input & Rectification: The module accepts 115V or 230V AC mains power, rectifies it to high-voltage DC, and filters it to smooth out the ripple.
- High-Frequency Switching: The DC is chopped at a high frequency by power MOSFETs, stepping it down to a lower voltage through a small, efficient transformer.
- Regulation & Filtering: The low-voltage AC is rectified again and filtered through hefty electrolytic capacitors to produce a clean 24VDC output. An onboard PWM controller constantly adjusts the switching to maintain exactly 24.0 VDC under varying loads.
- Protection & Monitoring: Integrated thermal sensors and overload detection circuits monitor the output. If the unit overheats or shorts, it triggers the onboard fault relay and illuminates the red FAIL LED on the front panel.
Field Service Pitfalls: What Rookies Get Wrong
Forgetting to Set the AC Input Voltage Selector
A classic rookie mistake is grabbing a new-old-stock 5503-267, wiring it to 230VAC European mains, and forgetting to flip the tiny rear voltage selector switch to 230V. At best, the supply won’t power up; at worst, you instantly cook the input rectifier bridge.
- Field Rule: Before mounting the module and landing your AC wires, look at the rear of the unit. Toggle the voltage selection switch to match your plant’s mains voltage exactly. Verify with a multimeter.
Ignoring the Cooling Fan Until It Seizes
These units rely heavily on their internal 12VDC cooling fans to prevent thermal shutdown in hot enclosures. Junior techs ignore the fan noise level until it starts rattling, then seize completely, causing the power supply to go into thermal foldback or shut down entirely during a summer heatwave.
- Field Rule: During your quarterly PM rounds, listen to the fan. If it sounds like a bag of marbles, order a replacement immediately. Don’t wait for it to fail and trip the turbine offline. Keep a spare 12VDC fan in the shop; swapping it takes ten minutes.
Overloading the 6A Output Capability
Techs often use this power supply to drive not just the MicroNet rack, but also a dozen 24VDC solenoid valves and a few indicator beacon stacks. Between the inrush current of the solenoids and the steady draw of the I/O, they push the unit past its 6A rating, causing the output voltage to sag to 18VDC.
- Field Rule: Do the math. A fully loaded MicroNet CPU and 16-channel I/O cards can draw close to 3 Amps. That leaves you only 3 Amps for field devices. If you need more, add a separate external 24VDC power supply for your solenoids and keep the 5503-267 dedicated to the control electronics.
5464-334
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
