Description
Key Technical Specifications
• Module Type: Half-height power supply (Installs in left rack slots)
• Redundancy: Dual power support (Lower = Primary, Upper = Backup)
• Hot-Swap Capability: Yes (Zero downtime when 2nd power supply is installed)
• AC Input Options: Low (85-132 VAC), High (175-264 VAC), Universal (85-264 VAC)
• DC Input Options: Low (20-30 VDC), High (88-140 VDC)
• Max AC Current Draw: 2.8 A rms (Full rack load)
• Max High DC Current: 2.5 A (Full rack load)
• Max Low DC Current: 11.0 A (Full rack load)
• Operating Temp: -30°C to +65°C
• Storage Temp: -40°C to +85°C
• Humidity Tolerance: 95% (Non-condensing)
• Dimensions: 120.7 mm x 50.8 mm x 251.5 mm
Product Introduction
When a turbine trips at 3 AM, the last thing you want to find is a dead 3500 rack. The Bently 3500/15 power supply module is the beating heart of the machinery protection system, converting raw facility power into clean, regulated DC for all monitoring channels. It is designed with a strict redundancy philosophy: the lower slot acts as the primary, while the upper slot serves as the hot backup.
Why does this specific module matter? Because it allows true hot-swapping. As long as you have a second power supply installed, you can pull a failing 3500/15 and slide in a replacement without ever interrupting rack operation or forcing a unit shutdown. Honestly, the wide input voltage tolerance (especially the universal AC option) makes it highly resilient against facility grid fluctuations. Bottom line—never run critical machinery protection on a single 3500/15. Always spec dual power.
Troubleshooting Quick Reference
• Rack Completely Dead / No LEDs | Cause: External power loss or blown input fuse | Relevancy: 90% | Quick Check: Measure AC/DC voltage at rear PIM terminals | Fix: Check upstream breaker; replace internal fuse if shorted
• “Power Supply Fault” Alarm, Rack Still Running | Cause: Backup supply failed or lost input | Relevancy: 85% | Quick Check: Inspect upper/lower module status LEDs | Fix: Reseat backup module; verify secondary feed voltage
• Intermittent Rack Reboots / Comm Drops | Cause: Voltage sag under load or bad backplane ground | Relevancy: 80% | Quick Check: Measure DC rails during high-vibration events | Fix: Check facility power stability; verify single-point rack grounding
• Module Won’t Seat / Pins Bent | Cause: Improper alignment during hot-swap | Relevancy: 75% | Quick Check: Visually inspect rear backplane connector | Fix: Carefully straighten pins; do not force module
• Power LED Flashing / Unstable | Cause: Internal hardware failure or overcurrent | Relevancy: 70% | Quick Check: Check total rack current draw vs. module rating | Fix: Replace power module; check for shorted sensor wiring
BENTLY 3500/15
Application Scenarios & Pain Points
• Offshore Oil Platforms: Grid instability and generator switching cause massive voltage sags. The wide input tolerance of the 3500/15 keeps the protection system alive when facility power dips momentarily.
• Petrochemical Refineries: Hazardous area compliance and continuous uptime are mandatory. Dual 3500/15 modules with ATEX/CSA certifications allow maintenance teams to replace a degraded power supply during normal operations without shutting down the compressor.
• Power Generation Turbines: High EMI and ground loops introduce noise. Proper single-point grounding of the 3500/15 rear PIM prevents internal switching noise from corrupting sensitive proximity probe signals.
Compatible Replacement Models
• ✅ Drop-in Replacement: Bently 3500/15-02-02-00 (High AC Dual). Same physical footprint, same hot-swap capability. Verify your exact A/B/C suffix options (Voltage/Certifications) before ordering. Surplus pricing ranges 3,000 to 8,000.
• ⚠️ Software Compatible: Bently 3500/15-05-05-00 (Universal AC). Same hardware platform, but accepts 85-264 VAC universally. Requires verifying rear PIM compatibility (Legacy AC PIMs are NOT compatible with Universal front panels). Plan 1 hour for installation.
• ❌ Hardware Incompatible: Bently 3500/15-04-04-00 (Low Voltage DC). Do not attempt to swap this into an AC-powered rack. The rear Power Input Module (PIM) is completely different, and connecting AC to a DC-rated rear board will destroy the module and potentially the backplane.
