Bently Nevada 286566-02 3500/50M Tachometer Module

Configured for high-speed rotational measurement and machine protection in 3500 Series platforms, the Bently Nevada 3500/50M 286566-02 (3500/50M Tachometer Module) provides direct physical signal acquisition from proximity probes and magnetic pickups.

Hardware Specifications

Mechanical Monitoring and TSI Characteristics

The 3500/50M module utilizes specific eddy-current probe scaling to convert high-frequency pulse trains into precise rotational velocity data. For proximity sensor inputs, operators must ensure gap voltage validation is performed, with -10 VDC targets confirmed at the signal entry point to maintain the linear measurement range required for shaft speed and phase reference. The module architecture includes advanced cross-talk suppression to isolate channel inputs, ensuring that sub-synchronous or high-frequency noise does not corrupt rotor dynamics telemetry. This signal processing integrity is required to calculate rotational acceleration and direction accurately without interference from adjacent transducer loops.

Frequently Asked Questions

Q: Can this module trigger external protection relays directly?

A: Yes, the module supports user-programmable alarm setpoints. When configured through the 3500 rack software, the module can execute alarm logic that triggers relay outputs to initiate machine trips or operator alerts.

Q: Is it possible to perform a hot-swap of this module while the 3500 rack is energized?

A: Yes, the 3500/50M is designed for hot-swap operations. The rack backplane maintains electrical isolation during insertion, though operators should ensure that system bypass functions are active in the configuration software to prevent unintended alarm trips during the maintenance cycle.

Field Installation Guidelines

1. Chassis Integration: Insert the module into the designated 3500 rack slot. Verify that the rear I/O module is secured and the backplane connector is fully seated to ensure reliable power and signal distribution.
2. Signal Wiring: Terminate magnetic pickup or proximity probe leads to the rear I/O module terminal blocks. Use shielded, twisted-pair cabling to minimize electromagnetic interference, ensuring the shield is landed at the rack common ground bus.
3. Configuration: Use the 3500 rack configuration utility to define input scaling, alarm thresholds, and peak-hold logic. Perform a verification test by simulating a pulse frequency to confirm rotational speed display accuracy.
4. Maintenance: Regularly check terminal block connections for corrosion or vibration-induced loosening. Confirm that DC gap voltages remain within nominal levels to ensure continued measurement precision.