Bently Nevada 3500 System – Core Modules Detailed Function Introduction

1. Chassis Modules

3500/05 – 14‑Slot Chassis

• Standard 19‑inch rack mounting
• Provides backplane bus communication and power distribution
• Used for medium/large rotating machinery (turbines, compressors, generators, etc.)

3500/06 – 7‑Slot Mini‑Chassis

• Compact 12‑inch chassis
• For space‑limited applications or machines with fewer measurement points
• Same functional logic as 14‑slot version, only fewer slots

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2. Power Supply Module

3500/15 – Power Supply

• Provides stable DC power to the entire chassis
• Supports 1+1 redundant configuration: automatic failover
• Includes over‑voltage, over‑current, reverse polarity protection
• Front‑panel LEDs indicate normal/fault/redundant status

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3. Rack Interface & Communication Modules

3500/20 – Rack Interface Module (RIM)

• Legacy basic interface module
• Handles chassis configuration, basic alarm logic, serial communication (RS‑232/422)
• Largely replaced by 3500/22M

3500/22M – Transient Data Interface (TDI)

• Centralizes data acquisition and management for all monitor modules
• Built‑in Ethernet port for direct connection to System 1 software
• Hardware‑based real‑time data processing and alarm logic
• Non‑volatile memory:
  • 2000 alarm records
  • 1000 system event logs (time‑stamped)
• Supports configuration upload/download, online monitoring, module diagnostics
• Supports redundant TDI for critical turbomachinery

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4. Relay / Output Modules

3500/32 / 3500/32M – Relay Module

• Provides dry contact outputs for alarm and shutdown interlocking
• 3500/32M supports:
  • Voting logic (2oo3, 2oo4, etc.)
  • Alarm delay, bypass, and testing functions
• Drives DCS alarms, ESD shutdown, audible/visual alarms
• Final execution element for critical protection circuits

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5. Monitor Modules (Core Measurement Functions)

5.1 3500/40M – Radial Vibration Monitor

• Accepts eddy‑current sensor signals
• Monitors: shaft vibration amplitude, gap voltage
• Outputs: real‑time vibration, alarm, danger signals
• Used on turbines, compressors, motors, etc.

5.2 3500/42M – Enhanced Vibration Monitor

• Supports:
  • Casing vibration (velocity/accelerometer)
  • Shaft vibration (eddy current probes)
• Can perform combined absolute + relative vibration monitoring
• Used on fans, pumps, gearboxes, compressors

5.3 3500/50M – Displacement / Position Monitor

• Monitors:
  • Axial Position
  • Differential Expansion
  • Eccentricity
  • Keyphasor
• Critical for detecting rotor-to-stator rubbing and catastrophic failure risks

5.4 3500/53M – Speed / Overspeed Monitor

• Monitors:
  • Operating speed
  • Zero speed (0 rpm)
  • Overspeed trip
  • Reverse rotation
• Complies with API 670 overspeed requirements
• Used for steam turbines, gas turbines, and critical drivers

5.5 3500/60M – Temperature Monitor

• Supports:
  • RTD (Pt100, etc.)
  • Thermocouple (J, K, T, E, R, S, B)
• Multi‑channel, isolated inputs
• Used for bearing temperature, winding temperature, lube oil monitoring

5.6 3500/72M – Reciprocating Machinery Monitor

• Monitors:
  • Piston rod drop
  • Pressure pulsation
  • Crosshead vibration / displacement
• Designed specifically for reciprocating machinery protection