Description Key Technical Specifications Parameter Specification Part Number 125760-01 Product Type Power Supply Module Series 3500 Monitoring System Input Voltage 24/48V DC nominal (18-60V DC range) Output Power 85 Watts maximum Output Voltages 5V DC, 15V DC, -15V DC to backplane Efficiency >80% typical Redundancy Supports 1 1 or 2 0 configurations Hot Swap Yes (with redundant partner) Mounting 3500 rack (front slot) Indicators Power OK, fault LED Protection Overcurrent, overvoltage, overtemperature Cooling Convection (no fan) Certifications CE, UL, CSA Condition New Surplus (Original Packaging) Product Introduction The BENTLY 125760-01 is the 3500/15 AC power supply module for the 3500 monitoring system. It mounts in the leftmost slots of the 3500 rack and converts incoming 24/48V DC power to the regulated voltages required by the backplane and all monitoring modules. This module is the foundation of reliable power distribution in turbine and compressor protection systems. The 125760-01 supports redundant configurations with two power supplies sharing the load. Hot-swap capability allows replacement without shutting down the monitoring system when redundancy is enabled. This unit is new surplus, factory-sealed in original Bently Nevada packaging. Pricing reflects market conditions for critical rotating machinery spares; contact us for current stock and firm quote. Frequently Asked Questions (FAQ) Q: Can I use a single 125760-01 in a 3500 rack, or do I always need two? A: You can run a single BENTLY 125760-01 in a 3500 rack, provided your total power draw stays under 85W. However, for critical machinery protection (turbines, compressors, pumps), running single power supplies is asking for trouble. If that one supply fails, the entire rack goes dark—no vibration monitoring, no protection. Industry best practice is redundant supplies: two 125760-01 modules sharing the load. If one fails, the other carries the rack indefinitely. Don’t skimp on power redundancy in protection systems. Q: What’s the difference between 125760-01 and 125760-02? A: The 125760-01 is the 24/48V DC input version. The 125760-02 is the 90-240V AC input version. They are not interchangeable—the input stage is completely different. Putting DC into an AC supply damages it instantly, and vice versa. Check your existing rack’s power requirements before ordering. Most industrial plants use 24V DC or 48V DC for instrumentation, so the 125760-01 is common. But if your rack has the AC version, you need 125760-02. The output power and mechanical fit are identical; input voltage is the only difference. Q: Does the 125760-01 require configuration or is it plug-and-play? A: It’s mostly plug-and-play. The BENTLY 125760-01 has no user-configurable settings. You slide it into the rack, connect the input power (observe polarity!), and it powers up. However, the 3500 rack configuration software must know which slots contain power supplies for proper monitoring. If you add a redundant supply to a previously single-supply rack, you may need to update the rack configuration in the software. The module itself requires no programming—it just delivers power. Q: Can I hot-swap a 125760-01 while the rack is running? A: Yes, but only if you have redundant power supplies installed. The BENTLY 125760-01 supports hot-swap when a second supply is present and sharing the load. If you have a single supply, pulling it kills the entire rack instantly. With two supplies, you can remove one, replace it, and the rack never blinks. The key: ensure both supplies are powered and healthy before pulling one. Also, observe ESD precautions—even though it’s a power supply, the internal electronics are static-sensitive. I’ve seen racks glitch because someone yanked a supply without grounding themselves. Q: What happens if I overload the 125760-01 beyond 85W? A: The 125760-01 has overcurrent protection. If you draw more than 85W, the supply will either shut down or go into current limit, depending on the fault severity. In a 3500 rack, each monitoring module draws a specific current from the 5V, 15V, and -15V rails. You must calculate total rack power during system design. Adding modules later without checking power budget can push the supply into overload. The module won’t immediately explode, but it will run hot, reduce lifespan, and eventually fail. Always leave 20% headroom on the 125760-01. If your rack approaches 70W, add a second supply for redundancy and load sharing. Q: What do the LEDs on the front indicate? A: The BENTLY 125760-01 has two status LEDs: Green “OK”: Supply is on and output voltages are within spec. Solid green = happy supply. Red “FAULT”: Output voltage out of range, over temperature, or internal failure. If you see a red fault, check input voltage first—maybe the DC supply feeding the rack dropped out. If input is good, the 125760-01 likely has internal failure. Swap it out if redundant; if single, schedule a shutdown. Don’t ignore red faults in protection systems—they mean your rack is running on borrowed time. Q: What’s the typical failure mode for these power supplies in the field? A: Capacitor aging is #1. The 125760-01 runs 24/7 in warm cabinets near turbines or compressors. Electrolytic capacitors dry out after 8-12 years. You’ll see intermittent rack resets, “power supply fault” alarms, or failure to power up fully. Second: input surge damage. Lightning strikes near plant wiring or switching transients on the DC bus can fry the input stage. Third: fanless design means heat builds up internally over decades. The 125760-01 is robust, but nothing lasts forever in a turbine hall. I recommend proactive replacement at 10-year intervals for critical machinery protection. Don’t wait for failure—schedule it. Q: Can I use a third-party 24V DC power supply to feed the 125760-01? A: Yes, the BENTLY 125760-01 expects a clean 24V or 48V DC input from an external supply. That external supply can be any brand as long as it provides stable, regulated DC within 18-60V and sufficient current (the 125760-01 draws about 4A at 24V input for full load). However, for critical applications, use high-quality industrial power supplies with good filtering and redundancy. A cheap supply with noise or poor regulation will stress the 125760-01 and reduce its life. The 125760-01 regulates internally, but garbage in = garbage out. Feed it clean power. Q: Does the 125760-01 provide power to field sensors, or only to the rack? A: Only to the rack backplane and modules. The generates 5V, 15V, and -15V for the monitoring modules’ internal electronics. It does NOT provide loop power or excitation for field sensors (proximity probes, accelerometers, etc.). Those sensors are powered either by the individual monitoring modules (each module generates its own probe power) or by separate external power supplies. Don’t look to the 125760-01 for field power—it’s strictly rack power. The 3500 system separates backplane power from field excitation for isolation and safety. C200/10/1/1/1/00 PLC 6ES7338-7UH01-0AC0 PLC DS303A3A01GXA003XH LG1093AA24 PLC MVME167PA-36SE PLC IC693CPU364-EK PLC MCV40A0220-503-4-00 PLC Email: [email protected] Phone: 86 15340683922 Sales:Wu Jiedong Our products are guaranteed for 1 year, with new and original production stopped and imported spare parts. All prices listed on the official website are subject to confirmation by contact: Wu Jiedong (manager). Our product: brand new original packaging Our warranty: All new or repaired parts have a 12 month warranty period beginning Our payment: 100% telegraphic transfer of inventory items before shipment, conditions can be proposed! If you have any downtime spare parts that you cannot find, please feel free to call or use email to contact me. If there are issues that the product cannot solve, please contact me. Product prices can be negotiated. Please do not consider contacting me!