MTL F802 Redundant Fieldbus Power System – Obsolete MTL RELCOM Spare Part

Technical Dossier

Product Details And Specifications

MTL F802 Redundant Fieldbus Power System – Obsolete RELCOM Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Solving the Discontinued Hardware Crisis

The MTL F802 was designed for a specific role that no modern off-the-shelf unit can replicate without engineering intervention: providing conditioned, redundant power to FOUNDATION Fieldbus H1 segments in safety-critical process environments. Plants running Emerson DeltaV or Honeywell Experion with legacy H1 fieldbus wiring depend on this module to maintain segment integrity. When the F802 is no longer available through standard distribution channels, the only alternatives are a full fieldbus segment redesign — which requires re-engineering, re-cabling, and re-validation — or sourcing a verified original unit from a specialist supplier.

The fieldbus segment powered by the F802 typically connects 4 to 16 field instruments: flow transmitters, pressure sensors, control valves. Losing power conditioning redundancy on that segment does not just risk one instrument — it risks the entire loop. In a refinery or chemical plant, that translates directly to unplanned shutdown exposure. Procurement teams that treat the F802 as a non-critical spare until failure are accepting a risk that is disproportionate to the cost of holding one or two units in reserve.

How to extend your automation asset life by 5–10 years with targeted spare parts strategy:

Condition & Reliability Assurance

Sourcing discontinued industrial hardware carries inherent risk. DriveKNMS applies a structured 5-step quality assurance process to every F802 unit before dispatch review:

1. Visual and mechanical inspection: Enclosure integrity, connector condition, and PCB surface examination for corrosion, burn marks, or physical damage.
2. Electrolytic capacitor assessment: Aging electrolytic capacitors are the primary failure mode in power conditioning hardware of this generation. Each unit is evaluated for capacitor condition; units showing signs of electrolyte leakage or bulging are rejected.
3. Pin and connector corrosion check: All fieldbus and power connectors are inspected under magnification for oxidation and contact resistance issues that would cause intermittent segment faults.
4. Firmware version verification: Where applicable, firmware revision is documented and matched against known stable releases for the F802 platform.
5. Functional power output test: Units are bench-tested for correct output voltage and current limiting behavior consistent with FOUNDATION Fieldbus H1 segment requirements.

Key Features for System Maintenance

• Drop-in replacement: The F802 is a direct form-fit-function replacement for existing MTL / RELCOM F802 installations. No fieldbus segment reconfiguration is required.
• No re-programming required: Fieldbus device addresses and segment parameters are held in the field devices and the DCS host — not in the power conditioner. Swapping the F802 does not trigger a re-commissioning event.
• Avoids engineering redesign costs: Replacing a like-for-like unit eliminates the need for segment re-engineering, cable modifications, or DCS configuration changes that a non-equivalent substitute would require.
• Maintains existing safety validation: In SIL-rated or functionally safe loops, introducing a non-equivalent component can invalidate the safety case. A verified original F802 preserves the existing functional safety documentation.

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

Q: Can you support multi-unit or repeat RFQ requests?
A: Yes. Send the model list, target quantity and destination so DRIVEKNMS can review sourcing options and quote the requirement as a project RFQ.