Emerson 8913-PS-AC | PAC8000 Replacement Power Module

Description

Product Introduction (Non-Templated)

A failed power module can take an otherwise healthy remote I/O node offline, so replacement work starts with voltage architecture—not just matching the part number. The Emerson 8913-PS-AC provides both 12 VDC system power and 24 VDC field power from an AC input, making it a dedicated power component for PAC8000 installations.

For legacy PAC8000 maintenance, the dual-output arrangement matters. The 8913-PS-AC also supports redundant power arrangements when paired with a second unit. That makes it relevant to DCS system migration, existing PAC8000 node maintenance, and planned legacy PLC/DCS replacement work where preserving established field wiring has value.

Key Technical Specifications

The manufacturer documentation specifically identifies 8413-FK-DN and 8414-FK-SU as mounting kits for the 8913/8914 power supplies. The terminal arrangement includes separate 12 VDC and 24 VDC output connections plus an auxiliary power-fail signal.

Important procurement note: do not treat a generic 24 VDC industrial power supply as an electrical substitute simply because its output voltage looks similar. The 8913-PS-AC provides two defined DC output rails for the PAC8000 architecture.

8913-PS-AC

Application Scenarios & Pain Points

In a process plant, a power-supply failure is rarely isolated to the power supply itself. Loss of the system rail can interrupt an entire I/O node, while loss of field power can create a different set of instrument alarms. The diagnostic mistake is assuming both outputs serve the same purpose.

• Process DCS remote I/O: Used to provide the dedicated system and field power required by PAC8000 remote I/O nodes. The 12 VDC system rail and 24 VDC field rail need to be checked independently during troubleshooting.
• Hazardous-area installations: The 8913-PS-AC was designed for applicable hazardous-location installations, including Class I, Division 2 applications. Certification requirements must still be checked against the actual site classification before replacement.
• Redundant power architecture: Two compatible power supplies can be arranged for redundancy. This is useful where a single power-supply failure cannot be allowed to interrupt the I/O node.
• Legacy system maintenance: The part remains relevant when maintaining installed MTL8000/ equipment even though the broader 8000 2/x power-supply family has been discontinued. That distinction matters when planning spares rather than assuming a new-build procurement path.

Field case: A typical emergency replacement starts with a dead node and a cabinet full of otherwise healthy electronics. Before installing the spare, an engineer should verify AC input, both DC output rails, terminal condition, and the power-fail circuit—otherwise the replacement can appear to have failed when the real problem is downstream wiring.

Related Products

• 8914-PS-AC — /MTL8000 AC power supply intended for 24 VDC field power at a higher 10 A rating. It is not a direct functional equivalent to the dual-output 8913-PS-AC because it does not provide the same 12 VDC system-power arrangement.
• 8413-FK-DN — DIN-rail mounting kit for the 8913/8914 power supplies. Relevant when the replacement installation requires DIN-rail mounting hardware.
• 8414-FK-SU — Surface-mounting kit for the 8913/8914 family. Use where the cabinet design calls for direct panel mounting rather than DIN rail.
• 8910-PS-DC — Earlier DC-input power-supply option in the MTL8000 family. It should not be treated as a drop-in replacement without checking the system’s input-power architecture; the 8913-PS-AC is specifically an AC-input unit.
• BQ2320-9R-EX — SafetyNet DC power-supply option referenced for supplying 12 V controller power. Its DC-input architecture makes it relevant to systems where AC power is not the preferred source.
• 8410-NS-PS — node-services component associated with power-supply status reporting. It is complementary infrastructure rather than a replacement for the 8913-PS-AC itself.
• 8020-CE-RH — Right-hand carrier extension used with I/O carrier arrangements. It is a mechanical/I/O infrastructure component, not a power-supply substitute.
• 8044-CC-20 — carrier extension cable, 2.0 m. Relevant when extending the I/O carrier arrangement; it does not replace the power-supply function.

The Engineer’s Guide: Field Pitfalls to Avoid

⚠️ Do not match on “24 VDC” alone.
The 8913-PS-AC has two separate DC outputs: 12 VDC system power and 24 VDC field power. Replacing it with a conventional single-output 24 VDC supply can leave the node without its required system rail.

How to avoid it: Check the cabinet drawings and terminal assignments before removal. The documented output connector separates the 12 VDC and 24 VDC circuits, with an auxiliary power-fail signal also present.

⚠️ Do not ignore hazardous-area certification.
A physically compatible power supply is not automatically an acceptable substitute for a Class I, Division 2 installation. Certification and installation requirements belong to the complete application, not merely the enclosure dimensions.

How to avoid it: Confirm the site’s hazardous-area classification and the required certification before approving a substitute.

⚠️ Inspect the terminals before energizing the replacement.
Old cabinet wiring can hide loose conductors, oxidation, overheated terminals, or damaged insulation. Well, technically, the new power supply may be perfectly healthy—the cabinet connection may not be.

How to avoid it: With power isolated, inspect the connector and conductors. After installation, verify the AC input and measure each DC output independently before reconnecting sensitive field loads.

Frequently Asked Questions (FAQ)

Can I replace the 8913-PS-AC with any 24 VDC power supply?

No. The 8913-PS-AC is not simply a 24 VDC supply. It provides 5 A at 12 VDC and 5 A at 24 VDC from an 85–264 VAC input. The 12 VDC system-power requirement is particularly important in installations.

What input voltage does the Emerson 8913-PS-AC accept?

The specified AC input range is 85–264 VAC, with documentation identifying operation across the normal AC supply range. The published specification also identifies 47–63 Hz for the supply.

Does the 8913-PS-AC provide both 12 VDC and 24 VDC?

Yes. Its dual-output architecture provides 5 A at 12 VDC and 5 A at 24 VDC. The two outputs are separately identified in the terminal documentation.

Can two 8913-PS-AC units be used for redundancy?

Yes. Emerson’s product information identifies redundancy capability when a power supply is paired with a second power supply. The exact cabinet arrangement should be checked against the installed architecture before commissioning.

Is 8913-PS-AC still a current product?

The MTL8000 8000 2/x power-supply family is documented as discontinued, with the manufacturer retaining the product information for reference. That makes date code, storage history, and test evidence important when buying replacement stock.

What should I verify when buying a surplus or refurbished 8913-PS-AC?

At minimum, request:

• Exact 8913-PS-AC nameplate and part-number confirmation
• Physical condition of terminals and enclosure
• Input-power test at an appropriate AC voltage
• Independent verification of both 12 VDC and 24 VDC outputs
• Power-fail signal verification where applicable
• Evidence of prior repair or component replacement
• Warranty terms and actual dispatch lead time

For an obsolete power supply, those checks are more meaningful than a generic statement that the unit is “tested.” The manufacturer documentation establishes the electrical function; the seller must establish the actual condition of the individual unit.