Triconex MOX720-P4668D 80026-518-01 Service-Ready Spare Part

Triconex MOX720-P4668D 80026-518-01 Service-Ready Spare Part for Industrial Maintenance

The Triconex MOX720-P4668D (P/N: 80026-518-01) is an original power supply module engineered for Triconex Tricon safety PLC systems. Designed to deliver stable, redundant DC power to the Tricon main chassis, this module is a critical component in high-availability safety instrumented systems (SIS) deployed across oil & gas, petrochemical, power generation, and advanced manufacturing facilities. When a power supply fault is detected during routine inspection or emergency diagnostics, immediate replacement with a verified service-ready spare is the fastest path to restoring system integrity and minimizing unplanned downtime.

At NINERMAS, every MOX720-P4668D unit is sourced from authorized channels, inspected against OEM electrical specifications, and tested prior to shipment. Each module ships with a 12-month warranty, giving maintenance engineers and procurement teams confidence in long-term supply continuity and post-sale support.

Spare Maintenance Table

Maintenance Planning for Continuous Operation

A power supply failure in a Tricon safety PLC system can cascade rapidly across the entire safety loop. When replacing the MOX720-P4668D, a thorough maintenance engineer will not stop at the power supply alone. The Tricon chassis backplane should be inspected for signs of thermal stress or connector wear, as a degraded backplane can cause intermittent power faults that mimic a failed supply module. The Triconex TCM4351 or TCM4352 communication modules installed in the same chassis should be checked for firmware version compatibility and communication integrity after any power cycle event.

I/O modules such as the Triconex 3805E digital output module and 3703E analog input module should be verified for proper power-on self-test (POST) completion following the supply replacement. Field wiring terminal blocks and marshalling panels connected to these I/O modules are common sources of intermittent faults that surface after a power interruption — inspect terminal torque and insulation resistance before returning the system to service.

The Triconex 3008 main processor module should be confirmed to be running the correct application version and that the SIS logic is executing without diagnostic alarms. If the facility uses a Tricon Communication Module (TCM) for Modbus or OPC-DA integration with the DCS, verify that the communication link re-establishes cleanly after the power supply swap.

For sites running redundant power feeds, the companion power supply module in the second slot — often a MOX720 series unit — should be inspected simultaneously. Redundant supplies that have been in service for more than five years should be considered for proactive replacement as part of the same maintenance window, even if no fault has been declared. Maintaining a minimum of one spare MOX720-P4668D in the site’s critical spare parts inventory is strongly recommended to support rapid recovery from future failures without waiting on procurement lead times.

Surge protection devices and UPS systems feeding the 24 VDC input rail should also be tested. A weakened UPS battery or a failed surge suppressor can subject the power supply module to voltage transients that shorten its service life. Fuse holders and circuit breakers in the power distribution panel supplying the Tricon cabinet should be inspected and load-tested as part of the same maintenance cycle.

Site Replacement Workflow

Step 1 — Verify Compatibility: Confirm the replacement MOX720-P4668D (80026-518-01) matches the chassis slot designation and firmware baseline of the installed Tricon system. Cross-reference the Triconex system configuration report or the TriStation 1131 project file for the expected hardware revision.

Step 2 — Isolate and Document: If the system does not support hot-swap in the current configuration, coordinate a controlled shutdown with the process safety team. Document the current diagnostic status of all modules in the chassis before removal.

Step 3 — Remove and Replace: Extract the faulty MOX720-P4668D from the chassis slot. Insert the service-ready replacement unit, ensuring the module is fully seated and the locking lever is engaged. The Tricon system will perform an automatic self-test upon power-up.

Step 4 — Verify System Recovery: Confirm all diagnostic LEDs on the power supply, main processor, and I/O modules return to normal operating status. Check the TriStation 1131 diagnostic display or the DCS alarm console for any residual fault messages. Verify that all SIS logic is executing correctly and that field device signals are within expected ranges.

Step 5 — Update Maintenance Records: Log the replacement in the site CMMS (Computerized Maintenance Management System), record the new module serial number, and update the spare parts inventory to trigger a replenishment order for the consumed spare.

Spare Parts Support FAQ

Q1: Is the MOX720-P4668D (80026-518-01) compatible with all Tricon chassis versions?
The MOX720-P4668D is designed for Tricon main chassis configurations including Tricon v9, v10, Tricon CX, and Tricon Enhanced platforms. Compatibility should always be verified against the specific chassis hardware revision and system configuration documentation before installation. NINERMAS technical support can assist with compatibility verification prior to order confirmation.

Q2: What testing is performed before shipment?
Every MOX720-P4668D unit supplied by NINERMAS undergoes pre-shipment electrical inspection and functional verification against OEM specifications. Units are checked for output voltage stability, connector integrity, and absence of physical damage. A test report is available upon request for critical SIS applications.

Q3: What is the warranty coverage and how is it handled?
All MOX720-P4668D modules supplied by NINERMAS are covered by a 12-month warranty from the date of shipment. Warranty claims are handled directly by NINERMAS with replacement or full refund options. The warranty covers manufacturing defects and functional failures under normal operating conditions as specified by Triconex.

Q4: Can NINERMAS support long-term or blanket purchase orders for this module?
Yes. NINERMAS supports long-term supply agreements, blanket purchase orders, and scheduled delivery programs for the MOX720-P4668D and other Triconex Tricon series spare parts. This is particularly valuable for facilities managing aging Tricon systems where OEM availability may be limited. Contact our team to discuss inventory reservation and priority supply arrangements.