Description
3500/20 125768-01 is the Rack Interface Module (RIM) for the Bently Nevada 3500 Series machinery protection system. This essential component acts as the primary communication gateway between the 3500 rack and external configuration software or plant-wide control systems. It manages rack-level tasks including configuration, data buffering, and system diagnostics while supporting the connection of a Keyphasor signal to the backplane. The 125768-01 hardware revision ensures robust data integrity and supports high-speed serial communications for real-time monitoring of critical rotating machinery.
Technical Specifications
- Part Number: 125768-01 (Module) / 3500/20 (Series)
- Function: Rack Interface Module (RIM)
- Keyphasor Inputs: Supports up to 2 Keyphasor signals per rack
- Communication Protocols: Proprietary Bently Nevada protocols via RS-232/RS-422/RS-485
- Front Panel I/O: RS-232 configuration port (9-pin D-shell)
- Indicators: OK, TX/RX, and Bypass status LEDs
- Power Consumption: 5.0 Watts typical
- Operating Temperature: -30°C to +65°C (-22°F to +149°F)
- System Slot: Must be installed in the first slot (next to the power supplies)
The Bently Nevada 3500/20 125768-01 provides the foundational intelligence for the 3500 rack, coordinating internal module timing and serving as the central point for system security keys and hardware-level configuration locks.
Model Comparison: 3500/20 125768-01 vs. Similar Models
The 3500/20 125768-01 is the standard non-redundant RIM, whereas the 3500/22M (TDI) represents the more modern Transient Data Interface which integrates the functions of a RIM with built-in Ethernet connectivity for direct software interface. Unlike the 3500/25 Keyphasor module which is dedicated solely to speed signals, the 3500/20 is a mandatory system controller required for the rack to operate. Compared to older versions of the RIM hardware, the 125768-01 revision features updated internal circuitry that improves immunity to electromagnetic interference and provides more stable serial data transmission over long cable runs. Additionally, it differs from the 3500/05 rack configurations in that this module is the active logic interface, whereas the /05 refers to the physical frame itself.
