Power Supply Unit | DSSR170 48990001-PC | ABB

Technical Specifications

The ABB DSSR170 48990001-PC is a voltage regulator unit for DC-input and DC-output power conversion applications within ABB Advant OCS systems. The DSSR170 48990001-PC accepts a 24 VDC input voltage and provides a regulated 5 VDC output voltage with an output current capability of 10 A, providing stable regulated power conversion for industrial control equipment.

Troubleshooting & Commissioning Checklist

Alignment Tracks: Slide the European standard double-height card into its sub-rack chassis channels. It must glide smoothly without binding or flexing the PCB substrate.
Safe Connector Interlock: Push firmly at the very end of travel to fully seat the power pins into the rack matrix. Hand-tighten all captive retention screws to eliminate micro-arcing from factory-floor vibration.
Chimney Convection Clearance: Ensure that the top and bottom perforated ventilation slats on the chassis are completely clear. Never drape loose manuals, routing wires, or ducting over this module. It relies entirely on passive convection.

Field Engineering Considerations

Vibration and Micro-Fretting: Systems mounted near high-impact heavy machinery suffer from continuous low-frequency structural vibration. This causes microscopic shifting between the DSSR170 48990001-PC male pin block and the sub-rack. Over years, this results in "fretting corrosion"—the mechanical wear and oxidation of the pin surfaces, leading to intermittent 5V logic power drops.
Captive Fastener Integrity: Technicians must always verify that the front-panel captive retention thumbscrews are firmly torqued into the rack framework. These screws are not cosmetic; they provide the mechanical lock that holds the multi-point DIN 41612 block fully mated and seated against constant industrial harmonics.

Technical FAQ

Q: The entire S100 I/O rack is completely dead with zero card LEDs lit. Has the DSSR170 48990001-PC failed?
A: Highly likely. Troubleshooting sequence: Turn off power, extract the module, and check the on-board 5A fuse. If the fuse is open, the module's overvoltage "Crowbar" circuit may have tripped to protect the bus. If a new fuse blows immediately upon power-up with an empty rack, the internal switching FETs are shorted, and the DSSR170 48990001-PC must be replaced.

Q: The 5V logic rail voltage drops or crashes to zero only when downstream I/O cards are plugged into the rack. Is the power supply defective?
A: No. This behavior indicates that the DSSR170 48990001-PC is working correctly and has entered Foldback Overcurrent Protection due to an external hard short circuit. Action: Pull out all daughtercards, re-insert them one by one, and power on after each insertion. The moment the 5V rail crashes, you have isolated the specific shorted card.

Q: The controller randomly logs "Halt" or memory parity errors during hot summer months. Is this linked to the DSSR170 48990001-PC?
A: Yes. The module relies entirely on fanless natural air convection. Over decades of operation, internal filtering capacitors dry out, increasing ESR and lowering thermal tolerance. When cabinet temperatures exceed +55°C, the 5V output begins to drift or sag. Check cabinet fan filters immediately, or replace the aging power module.

Q: Do you supply brand-new, original parts or second-hand refurbished items?

A: Our stock consists of Original New items; all products undergo quality inspection to ensure they are fully functional.

Q: What guarantees are included with the shipment?
A: All items in stock are tested by engineers, packed in professional ESD packaging, and shipped via express logistics with a global delivery time of 24–48 hours.

Q: How long does global shipping take?
A: Stock items are typically dispatched within 24 hours. Shipments are sent via DHL or FedEx Express, taking approximately 3–5 days to reach Asia, 4–6 days to Europe and the Middle East, and usually arriving within a week in major industrial regions worldwide.

Q: If the model I need is not listed on the website, can I request a quote?
A: Yes. We hold over 200,000 SKUs of industrial spare parts in stock, and many long-tail models are not listed in full. You can send us an RFQ (Request for Quote) directly, and we will provide wholesale pricing promptly.

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