Honeywell SPS5710-2-LF 51198685-100 | 24VDC 20A Power Module In Stock

Description

Key Technical Specifications

Product Introduction

A C300 cabinet loses its 24 VDC bus and you lose the controllers, the I/O, and the FTE link — all at once. I’ve watched a plant lose two production trains because a power module let go at 2 a.m. and nobody had a spare on the shelf. This is the part that fails quietly and takes the whole rack with it.The SPS5710-2-LF is the TDI power unit sitting behind Honeywell part number 51198685-100. It takes 100–240 VAC in and holds 24–26 VDC at 20 A out, rated for −40 °C to +70 °C ambient with a linear derate of 0.5 A per degree above 65 °C. That derate curve matters. I’ve seen cabinets in Gulf Coast summer conditions cooking these units at 70 °C ambient, and the ones that survived were the ones with working ventilation and a clean input supply. Rated power figures are inconsistent across reseller channels — 100 W, 240 W, 500 W all appear. Don’t trust any of them; pull the OEM datasheet. One honest note: this revision is picky about input-line quality. Dirty mains with harmonics will shorten its life faster than any spec sheet admits.

Quality SOP & Tech Pitfalls

The Lab Report (SOP)Every unit that leaves our dock goes through the same five steps, no exceptions:

1. Visual / counterfeit check — nameplate silkscreen, Honeywell P/N, REV letter, TDI P/N 140519-2-LF, serial number, and original anti-static bag integrity
2. Live test on a test rack — energize at 120 VAC and 240 VAC separately; log output voltage and load response
3. Insulation resistance and multimeter checks — Fluke 115 for continuity and voltage; Hi-Pot insulation test between input and output
4. Firmware / revision logging — record REV letter and serial against the nameplate photo shipped with the unit
5. Anti-static sealing — vacuum bag, foam, shock-rated outer carton

The Engineer’s Warning (Pitfalls)Two mistakes cause most of the downtime I see with this part.First: mixing revisions in a redundant pair. The 51198685-100 and the 51199929-100 both show up in the same C300 cabinet listings, and resellers treat them as interchangeable. They are not automatically. One site swapped a 51199929-100 into a slot that had a 51198685-100, and the redundant pair fought each other for three days before the cabinet settled. Photograph the nameplate of the unit you’re replacing. Match the REV letter.Second: ignoring the derate curve. Above 65 °C ambient, output drops 0.5 A per degree. At 75 °C you’ve lost 5 A. If your cabinet is already drawing 18 A, you just built a latent failure.Field disaster, real: a refinery tech replaced a failed 51198685-100 with a “compatible” surplus unit from a broker. The unit powered up fine. Six weeks later, in a heat wave, it dropped output to 22 VDC under load. The C300 browned out. Two trains down for 11 hours. The part wasn’t defective — it was the wrong revision for a hot cabinet.

Installation & Configuration Guide

Phase 1 — Pre-Installation (⚠️)

1. ⚠️ Confirm the redundant partner module is healthy and carrying load. If both are degraded, stop and plan a controlled shutdown — do not swap blind.
2. ⚠️ Open the cabinet only per your site’s hazardous-area permit. This unit is Class I, Division 2 / Zone 2 rated.
3. ⚠️ Photograph everything before touching a wire: AC input terminals, DC output bus connections, slot position, and the nameplate of the old unit.
4. Wait 5 minutes after AC disconnect for input capacitor discharge. Verify 0 VAC at the terminals with a Fluke 115 before proceeding.

Phase 2 — Removal

1. Label AC line/neutral/ground and DC +/− with numbered tags. Do not rely on wire color.
2. Release the mounting clips or fasteners evenly — do not pry from one corner; bent rails cause poor seating later.
3. Note the slot number. Write it down.

Phase 3 — Installation

1. Copy the old unit’s configuration exactly — slot position, terminal orientation, and any jumper or DIP settings. This single step prevents roughly 90% of startup failures on this platform.
2. Seat the module fully until the connector engages with positive resistance. A half-seated unit will pass a no-load test and fail under load.
3. Torque terminal screws to the OEM value in the Honeywell GEM manual. Under-torqued AC terminals are the number one cause of terminal-block burning I see in the field.

Phase 4 — Power-On & Testing

1. Restore AC. Confirm 24–26 VDC at the output terminals with a multimeter before reconnecting load.
2. Check the LED status against the Honeywell GEM manual boot sequence. A steady green is not enough — confirm the C300 controller and I/O modules register healthy.
3. Verify the redundant partner reports “healthy” in the C300 diagnostics.
4. Log the new serial number, REV letter, and commissioning date in your maintenance record.

Compatible Replacement Models

Frequently Asked Questions (FAQ)

“Can I hot-swap this safely?”
Supplier data says hot-swap is supported. I don’t recommend it without confirming two things first: that the redundant partner is healthy and carrying load, and that your Honeywell GEM manual explicitly authorizes live removal for your cabinet revision. If the manual is silent, do a planned swap. I’ve seen “hot-swappable” claims end badly.“Is 51198685-100 the same as 51199929-100?”
Not automatically. Both appear in C300 cabinet power listings, and brokers often sell them as interchangeable. Match the part number and REV letter on your old unit. If you must cross-reference, load-test the candidate unit in your own cabinet before trusting it.“What condition is this sold in?”
New surplus. Honeywell discontinued this line, so the OEM channel is closed. Ask any supplier for the receiving date, nameplate photos, and test records — and put the condition in writing on the purchase order.“Why does my replacement fail under load but pass a no-load test?”
Because the derate curve is real. Above 65 °C ambient, output drops 0.5 A per degree. A unit that reads 24 VDC on a bench at 25 °C can sag to 22 VDC at 75 °C under full load. Test under load, in the cabinet, at ambient temperature.“What warranty should I expect?”
Surplus channels typically offer 6–12 months; some advertise one year. Get it in writing, and specify that the warranty covers load-tested performance, not just “powers up.”“Do I need to reconfigure the C300 after replacing it?”
No logic reconfiguration is required — this is a power module, not a controller. But you should verify the C300 diagnostics report both power channels healthy, and confirm the FTE network and I/O links came back clean.Disclaimer: Parameters compiled from public reseller and nameplate sources. Rated power figures conflict across channels (100 W / 240 W / 500 W). Final selection must be based on the Honeywell GEM manual and the physical nameplate. For safety-instrumented or hazardous-area installations, engage a certified engineer.