Description
Modicon AS-P890-000R | Power Supply Module 115/230VAC
Product Introduction
When an entire control chassis drops offline due to erratic voltage sags, troubleshooting rack health starts at the primary power entry point. The AS-P890-000R is not a commercial off-the-shelf power brick; it is a ruggedized chassis power supply engineered specifically for legacy Modicon 984 and 800-series backplanes. It slides directly into the left-hand power slot of the chassis to deliver clean, regulated power rails across high-density I/O configurations.
Accepting standard 115 or 230 VAC line inputs, this module distributes robust internal DC currents to keep processors and communication cards operating under strict timing parameters—though your ripple tolerance and thermal de-rating margins will vary depending on cabinet cooling efficiency and incoming line stability. It serves as an exact-fit replacement to keep aging industrial infrastructure running without a disruptive system redesign.
AS-P890-000R
Key Technical Specifications
| Parameter | Specification Metric |
| Module Type | Chassis Power Supply Unit |
| Input Voltage Range | 115 VAC / 230 VAC switch-selectable (50/60 Hz) |
| DC Output Rails | +5VDC, +4.3VDC, and auxiliary logic rails |
| Chassis Compatibility | Modicon 800-series / 984 standard backplanes |
| Status Indicators | Front-panel DC power OK and fault LEDs |
| Cooling Method | Natural convection / internal heat-sink dissipation |
| Mounting Slot | Dedicated left-end power supply rack slot |
| Weight Envelope | Heavy-duty industrial transformer housing (~2.1 kg) |
Application Scenarios & Pain Points
- Heavy Manufacturing Power Dips: An automotive stamping facility suffered intermittent CPU reboots whenever plant heavy presses fired up, causing line halts; swapping in a verified surplus AS-P890-000R with healthy bulk capacitors eliminated the brownout reboots.
- Wastewater Treatment Plant Upgrades: Facilities operating in high-humidity, fluctuating-grid environments rely on this power supply’s robust transient filtering to protect sensitive processor cards from line surges.
- Continuous Oil & Gas Compression Skids: Unplanned power supply failures translate directly to lost revenue. Having a verified OEM drop-in power unit ready on the shelf minimizes mean time to repair (MTTR) during unexpected hardware failures.
QA & Live Testing SOP (Trust Signal)
We treat vintage power hardware with rigorous electrical safety and load-testing protocols. Before an AS-P890-000R ships from our inventory, it passes a comprehensive validation regimen:
- Visual & Transformer Audit: Inspected for OEM seals, zero signs of electrolytic capacitor bulging or leakage, and clean terminal connection points.
- High-Pot Insulation Testing: We verify primary-to-secondary dielectric strength to ensure absolute worker safety against line-voltage breakdown.
- Dynamic Load-Rack Testing: Powered on a dedicated Modicon test chassis under simulated maximum I/O load, measuring output rail stability and ripple voltage using calibrated oscilloscopes.
- Protective Packaging: Enclosed in anti-static materials and packed in heavy-duty foam-lined shipping cartons to prevent mechanical impact during transit.
Field Engineer’s Pitfall Guide
- ❗ Line Voltage Switch Position: Always verify the 115/230 VAC input selector switch before applying mains power. Leaving it set to 230V while feeding 115V causes low output rails, while setting it to 115V on a 230V line will instantly destroy the primary transformer.
- ❗ Backplane Overloading: Do not exceed the cumulative current draw limits of the power supply by packing a single chassis with too many high-draw legacy communication or analog modules.
- ❗ Hot-Extraction Dangers: Never service or pull this power supply while the main cabinet AC disconnect is closed; exposed high-voltage AC terminals inside the housing present severe electrical shock hazards.
Intent-Driven FAQ
Can this power supply handle both 115VAC and 230VAC input lines?
Yes. The AS-P890-000R features a selectable input voltage configuration. Ensure the physical voltage selector matches your facility supply line before energizing.
Is this an original OEM part or a third-party refurbished unit?
This is a genuine legacy Modicon / Schneider Electric module sourced as verified industrial surplus, thoroughly load-tested on live test benches to guarantee dependable performance.
What causes the DC OK indicator light to go dark during operation?
A dark DC OK LED typically indicates an internal overcurrent trip, a shorted backplane rail, or a blown primary input fuse resulting from a severe line transient or component wear.
Does this supply include battery backup integration for memory retention?
Memory backup in these legacy architectures is typically handled by separate RAM/battery modules or processor-mounted cells rather than the primary AC power supply unit itself.
