Brief Product Description

Bently Nevada 3500/32 (part number 125720-01) is a 4-channel relay output module for the 3500 machinery protection system. This full-height rack module provides four independent SPDT relay outputs, each of which can be separately configured with alarm drive voting logic. It can access Alert, Danger and Not OK status signals from any monitoring channel in the 3500 rack to build flexible AND/OR interlock logic for rotating machinery protection. Each relay supports selection of normally energized or normally de-energized state and latching function. Front panel LED indicators show module health and relay trigger status. Widely used for turbine, compressor and large motor vibration protection alarm and trip interlock. As a legacy machinery monitoring spare component, it is supplied as fully-tested surplus and refurbished units for maintenance and retrofit of existing Bently 3500 rack installations.

Core Product Functions

• Provide 4 independent SPDT relay dry contact outputs for machinery alarm and trip interlock signals
• Programmable alarm drive voting logic using AND / OR combination of any rack monitor channels
• Accept Alert, Danger and Not OK fault signals from vibration, speed and displacement monitoring modules
• Each relay configurable as normally energized or normally de-energized, with optional latching mode
• Front panel LED indicators to display module health status and relay actuation state
• Work together with 3500 series monitor cards to realize rotating machinery protection interlock output
• Transmit protection contact signals to ESD, DCS or local trip relay cabinets for emergency shutdown
• Full-height form factor for installation in any slot on the right side of the 3500 rack interface module

• Configured via Bently 3500 rack configuration software on engineering workstation

Application Scenarios

• Bently Nevada 3500 machinery protection systems for steam turbine, gas turbine and large compressors
• Power plant generator, boiler feed pump and large fan vibration monitoring and protection racks
• Oil & gas, petrochemical process compressor and high-speed rotating equipment protection
• Mining, metallurgy large motors and rotary equipment condition monitoring and trip interlock
• Interlock signal transmission between machinery protection rack and SIS/ESD emergency shutdown system

• Spare replacement relay module for maintenance and retrofit of legacy Bently 3500 machinery protection racks

FAQ (Frequently Asked Questions)

• Q: Relay fails to trigger alarm after installing 3500/32 125720-01?
  A: Check rack configuration software logic setup, relay normal/de-energized selection, module backplane contact and dry contact wiring.
• Q: Does 3500/32 support hot-swap replacement while the 3500 rack is energized?
  A: Not recommended for critical machinery running. Follow lockout-tagout procedures and stop relevant protection logic before module replacement.
• Q: Can this relay module be used independently without other 3500 monitor cards?
  A: No, it only executes relay output logic and must work with 3500 rack, power supply and monitoring input modules.
• Q: What is the difference between 3500/32 and 3500/33?
  A: 3500/32 is 4-channel relay module, 3500/33 is 16-channel relay module for more interlock points.
• Q: Is Bently 3500/32 125720-01 available for brand-new machinery protection projects?
  A: This legacy 4-channel relay output module has reached end-of-life. Only fully-tested surplus and refurbished units are offered for existing-site maintenance and retrofit tasks.