Product Overview

The ABB PFSK101​ (order/material codes YM322001-ED​ / 3BSE018878R1) is a DIN-rail industrial switching power supply unit belonging to ABB’s PFSK family, positioned as a compact 24 V DC / 5 A (120 W) localized SMPS for two distinct ABB automation contexts. First, it serves as the tension-system rack PSU​ in ABB Pressductor / PFEA tension control frames — feeding the PFEA tension electronics (PFEA111/112/113 we covered earlier), the PFSA140 amplifier, the PFRA101 relay unit, and the PFTL load-cell / Pressductor sensor excitation, often with a multi-rail internal build (+5 V / ±15 V / 24 V isolated, depending on the PFSK101 sub-variant — the YM322001-ED / 3BSE018878R1 article is the 24 V 5 A single-rail DIN version most commonly stocked). Second, it serves as a local DIN SMPS for small AC 800M / 800xA nodes​ — feeding a PM891-class CPU, a CI854A / PDP800​ communication module, and a handful of S800 I/O cards in a decentralized skid where running the full S800 + redundant Coupler + cabinet PSU is overspecified. In both roles the PFSK101​ replaces the older, heavier linear supplies that ABB’s tension skids and early AC800M panels used — the ≥92 % efficiency, 100–240 V AC auto-range, and 15 A / 10 s peak let it start 3–4 PFEA-class modules simultaneously on a winder panel without sagging.The PFSK101​ is built as a enclosed DIN enclosure ~120 × 60 × 120 mm (H×W×D, ~0.5 kg), clipping onto 35 mm DIN (EN 60715) with screw terminals for AC in (L/N/PE) and 24 V DC out (+ / – / PE). Front face carries a green “DC OK” LED — the only diagnostic the unit needs, since it’s a passive SMPS, not a smart module. Input is 100–240 V AC (85–264 V AC wide, 47–63 Hz), output is 24 V DC ±0.5 % regulation, 5 A continuous, 15 A peak ≤10 s, ripple ≤100 mVpp (20 MHz BW), efficiency ≥92 % full-load, PF ≥0.9. Protection is comprehensive: OVP, OCP, SCP, OTP, all self-recovering. Operating –20…+70 °C, IP20 (cabinet internal), CE / UL 508 / cULus / IEC 61010-1 / RoHS, Sweden/Finland origin typical.Lifecycle-wise, the PFSK101​ (YM322001-ED) is current/active in ABB’s PFSK / tension-system spare channel — new-from-ABB available through drives/disti, but the unit also appears heavily on spare BOMs for plants with frozen Pressductor / PFEA winder builds and for AC800M skid builds that used local DIN PSU instead of S800 Coupler + CI801 + rack PSU. It is NOT the DCS rack PSU (that’s NPOW-41 for INFI 90, or S800’s own PS801/PS802) and NOT the drive cabinet PSU (that’s NMPP-02 for ACS800, NXPP-02C for ACS880) — the PFSK101​ is the “tension-skid / small AC800M node” DIN SMPS, lighter and cheaper than those cabinet-level units.

Technical Specifications

Main Features and Advantages

24 V DC 5 A in a Compact DIN Enclosure.​ The PFSK101​ exists because ABB’s tension skids (PFEA + PFSA + PFRA + PFTL) and small AC800M nodes needed a SMPS lighter than the old linear bricks and more localized than the cabinet-level NMPP-02 / NXPP-02C. At 120 × 60 × 120 mm and ~0.5 kg, the PFSK101​ clips onto the same 35 mm DIN row as the PFEA112-20 tension electronics it feeds — one PFSK101​ can feed 2× PFEA112-20 (2 zones × 2 units = 4 zones total) plus a CI communication module and a small S800 I/O slice, all within the 5 A / 120 W budget. This “local DIN PSU next to the electronics it feeds” topology keeps the tension-skid panel self-contained: 230 V AC in at the top of the DIN, PFSK101​ in the middle, 24 V distribution block below, PFEA / CI / S800 I/O on the same DIN — no need to run a 24 V homerun from the drive MCC’s NMPP-02 10 m away (which would mean 1 % voltage drop on a 2.5 mm² trunk at 5 A — the PFSK101​ local avoids that).≥92 % Efficiency, Low Heat, 15 A Peak Start.​ The PFSK101​ is a switcher, not a linear — 92 % full-load efficiency means ~10 W dissipation on a 120 W load, vs ~40–50 W on an old linear (dropping 230 V → 24 V via pass transistor). In a tension-skid panel that also houses 2× PFEA112-20, a CI module, and maybe an S800 DI/DO pair, the PFSK101‘s low heat keeps the panel’s internal ambient down, which keeps the PFEA’s load-cell amplification stable (load-cell mV signals drift with local temp). The 15 A / 10 s peak matters at power-up: a PFEA112-20 + an S800 rack of 8 cards can draw 3–4 A inrush for 2–3 seconds as the S800’s bulk caps charge — the PFSK101‘s 15 A peak covers that without folding back, whereas a generic 5 A SMPS without peak headroom would UVLO-trip on every panel power-up.≤100 mVpp Ripple — Tension-Sensor Friendly.​ The PFSK101‘s ripple spec (≤100 mVpp, 20 MHz BW) is deliberately tight for a 120 W DIN SMPS — this matters because the PFSK101‘s 24 V rail feeds not just logic (PFEA, CI, S800) but also, on Pressductor racks, the sensor excitation (the PFSK101 internal sometimes carries +5 V / ±15 V isolated taps for PFTL / Pressductor load cells — the YM322001-ED 24 V 5 A DIN version is single-rail, but the PFSK family includes multi-rail rack-mount versions for Pressductor; confirm your article). Even on the 24 V-only DIN version, the PFEA’s own load-cell excitation is 5–10 V DC from the PFEA internally(fed by the PFEA’s 24 V input), so PFSK101​ ripple on 24 V shows up as PFEA internal regulator ripple on the excitation — if the PFSK101​ ripple were 300 mVpp, a 2 mV/V load cell on a 10 V excitation would see ~0.6 % FS noise on tension-PV. The PFSK101‘s ≤100 mVpp keeps that contribution below 0.2 % FS — acceptable for most winding, but for foil/metals high-precision, the panel builder still adds a small LC on the PFEA 24 V feed as extra insurance.Global-Range AC Input & Self-Recovery Protection.​ 100–240 V AC auto-range means the same PFSK101​ BOM works in Europe (230 V), North America (120 V), Asia (200–240 V), and Japan (100 V) — tension skids are OEM-shipped globally (ABB, Voith, Metso, Andritz winder packages often embed ABB PFEA + PFSK101), and the OEM doesn’t want two BOM lines. Cold-start surge ≤30 A means the PFSK101​ won’t trip a 10 A C-curve upstream MCB when the panel powers up (the inrush lasts <1 ms, C-curve typically rides through). Protection is OVP/OCP/SCP/OTP, all self-recovering — if a panel tech shorts the 24 V while probing the PFEA’s terminal, the PFSK101​ folds back, releases when the short clears, no fuse to replace (unlike the old linear bricks that had a 5×20 glass fuse on the DC side that always blew at 2 AM). This self-recovery is the #1 maintenance win on tension-skid panels in humid/crawly environments (paper machine basements, cold-rolling emulsion mist) where occasional 24 V screw-short happens.DC OK LED & No Hot-Swap.​ Front green LED = 24 V healthy; dark = AC lost or tripped (OCP/OTP). Simple. The PFSK101​ is not​ hot-swappable — swap requires LOTO on the AC inlet (the unit has no service switch; pulling live arcs the AC terminal). This is different from the S800 PSU (PS801/PS802) which supports redundancy/hot-swap in the S800 rack — the PFSK101​ is DIN-local, not rack-backplane, so no hot-swap. In a tension-skid panel, this means a PFSK101​ failure takes the whole skid’s 24 V down (PFEA goes dark, break-relay drops, winder faults safe) — planned swap during a roll-change or winder stop is the norm, not live-swap.