Hollysys SM910 DCS Power Supply Module

Hollysys SM910 DCS Power Supply Module — Stop the Clock on Downtime, Ship Today

Every hour a DCS power supply stays offline translates directly into lost production throughput. The SM910 is the dedicated 24 VDC bus power supply card for Hollysys HOLLiAS-series distributed control systems. When this card fails, the entire I/O rack it feeds loses communication with the controller — alarms cascade, operators lose visibility, and process safety interlocks may trip. We stock the SM910 in Xiamen and can have a unit on a DHL or FedEx express pallet within hours of order confirmation. No lead-time negotiation, no factory minimum-order delays.

URGENT REQUIREMENT? Contact: [email protected] | WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

Field experience shows the SM910 fails in three primary scenarios: (1) input surge events that exceed the internal MOV clamping threshold, (2) electrolytic capacitor aging after 5–7 years of continuous operation in ambient temperatures above 45 °C, and (3) connector oxidation on the backplane edge connector causing intermittent 24 VDC dropout. Before condemning the module, verify the following:

• Fault Code PWR-01 / PWR-02: Indicates output under-voltage. Measure 24 VDC rail at the rack bus connector with a calibrated DMM. If reading is below 22.8 VDC under load, the SM910 output stage has degraded — replace immediately.
• Fault Code PWR-05: Over-temperature shutdown. Check cabinet ventilation and ambient temperature before inserting a replacement unit. Inserting a new SM910 into a thermally saturated enclosure will trigger the same fault within minutes.
• Backplane Seating: The SM910 uses a 64-pin DIN 41612 Type C connector. Inspect the female backplane socket for bent pins or carbon deposits before insertion. Clean with isopropyl alcohol (IPA ≥ 99%) and allow full evaporation.
• No DIP Switch or Address Configuration Required: The SM910 is a passive power supply card — it carries no firmware, no node address, and no rotary switch settings. Hot-swap is supported on HOLLiAS racks with redundant PSU slots; for single-PSU racks, a controlled shutdown of the affected I/O rack is required before card swap.
• Redundancy Pairing: If your rack uses dual SM910 modules in 1+1 redundancy, replace both cards if the primary has been in service for more than 4 years. Mismatched aging between primary and standby units can cause oscillatory switchover events.
• Post-Replacement Verification: After insertion, confirm 24 VDC bus voltage stabilizes within 200 ms. Monitor the HOLLiAS engineer station for PWR status LED transition from red to green. Log the replacement date in the maintenance record for warranty tracking.

Reliability in Harsh Conditions

The SM910 is designed to operate continuously in the demanding environments typical of petrochemical plants, power generation facilities, and steel mills — locations where ambient conditions routinely exceed the tolerances of commercial-grade electronics.

• Vibration Resistance: Qualified to IEC 60068-2-6 (sinusoidal vibration, 10–150 Hz, 1 g acceleration). The internal transformer and capacitor bank are mechanically secured with epoxy potting compound to prevent resonance-induced solder joint fatigue.
• Shock Tolerance: Tested to IEC 60068-2-27 (15 g, 11 ms half-sine pulse). Suitable for installation on vibrating machinery platforms and skid-mounted control panels.
• Thermal Cycling: Validated across 500 thermal cycles (−25 °C to +70 °C) with no measurable drift in output regulation. PCB substrate is FR4 with 2 oz copper pour for thermal mass.
• Humidity & Condensation: Conformal coating on the PCB assembly provides protection against moisture ingress in coastal and high-humidity process environments. Coating specification: acrylic, IPC-CC-830B compliant.
• EMC Immunity: Meets IEC 61000-4-2 (ESD, ±8 kV contact), IEC 61000-4-4 (EFT/Burst, 2 kV), and IEC 61000-4-5 (surge, 1 kV line-to-line). The input filter stage incorporates a common-mode choke and X/Y capacitor network to suppress conducted interference from variable-frequency drives and motor starters sharing the same distribution panel.

Global Express Logistics

Our warehouse is located in Xiamen, Fujian Province — one of China’s primary export hubs with direct access to Xiamen Gaoqi International Airport and Xiamen Port. This geographic position enables same-day dispatch for orders confirmed before 15:00 CST.

• DHL Express Worldwide: Transit time 1–3 business days to Europe, North America, Southeast Asia, and the Middle East. Real-time tracking provided at time of dispatch.
• FedEx International Priority: Available for shipments to the Americas and Oceania. Typical transit 2–4 business days door-to-door.
• Export Documentation: Commercial invoice, packing list, and certificate of origin (CO) issued with every shipment. HS Code 8537.10 declared for customs clearance. Dangerous goods declaration not required for this module.
• Packaging Standard: Each SM910 is individually wrapped in anti-static PE foam, placed in a rigid corrugated carton with 50 mm foam padding on all six faces. Drop-test certified to ISTA 2A for parcel carrier handling.
• Emergency Freight: For critical shutdowns, we can arrange next-flight-out (NFO) courier service with hand-carry documentation. Contact us directly on WhatsApp for NFO arrangements.

Contact Information

📧 Email: [email protected]
💬 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
📍 Location: Xiamen, China
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