BENTLY NEVADA

1.Core Functions

The 3500/22M combines two jobs in one card: it acts as the Rack Interface Module (RIM) for the entire 3500 rack, and as an embedded communication / data processor (similar to an external TDXnet processor). Every 3500 rack must contain exactly one TDI or RIM in Slot 1.www.plcva.com

1. Rack interface & configuration gateway
   • Manages rack-level configuration, mode control (RUN / PROGRAM keylock), rack reset, and OK-status relay.
   • Hosts the front-panel USB-B port and Ethernet link for local or remote engineering access via 3500 System Configuration software.
2. Continuous static data collection
   • Polls all M-series monitor modules (e.g. 3500/40M, 3500/42M) and collects their steady-state measured values, alarm states, and four nX (synchronous) amplitude & phase values per measurement point.
3. Transient / startup-coastdown data capture
   • Captures waveforms at programmable speed increments and time intervals during machine startup and shutdown.
   • Increasing-speed and decreasing-speed intervals are independently configurable.
   • Collection can be triggered when machine speed enters one of two programmable speed windows. This is the data used to build Bode, cascade and full-spectrum plots.
4. Alarm event data capture (pre- and post-event)
   • On an alarm trip, buffers pre- and post-alarm data:
     • Static values at 1 s intervals for 10 min before / 1 min after.
     • Static values at 100 ms intervals for 20 s before / 10 s after.
     • Waveform snapshots at 10 s intervals for 2.5 min before / 1 min after the alarm.
5. Dynamic waveform & spectrum acquisition (with optional Channel Enabling Disk)
   • Up to 48 channels of waveform data.
   • Synchronous sampling options from 16 samples/rev × 128 revolutions up to 1024 samples/rev × 2 revolutions.
   • Asynchronous, anti-alias-filtered sampling supporting up to an 800-line spectrum, with frequency spans from 10 Hz up to 30 kHz.
   • Channel pairs can be presented as shaft orbit or full-spectrum plots across multiple monitors.
6. Keyphasor signal support
   • Accepts up to four system Keyphasor signals (from a 3500/25 or 3500/50M) to provide speed and phase reference.
   • Speed range: 1 rpm to 100,000 rpm (1–16 dynamic channels), 60,000 rpm (17–24 channels), 30,000 rpm (25–48 channels). Multi-event-per-revolution inputs up to 20 kHz.
7. Rack-wide hardware control & diagnostics
   • I/O Module OK relay (normally energized) signals rack health; rated up to 5 A @ 24 Vdc/120 Vac.
   • Dry-contact inputs for Trip Multiply (inhibit alarms in programmable windows), Alarm Inhibit, and Rack Reset.
   • Front-panel LEDs: OK, TX/RX, TM (Trip Multiply), CONFIG OK.
8. Network communication
   • USB-B front panel: local engineering port, up to 115.2 kbaud.
   • 10/100Base-TX RJ-45 Ethernet: up to 100 m, TCP/IP.
   • 100Base-FX fiber-optic (MT-RJ): up to 2000 m multimode, for noise-prone plant environments.
   • Protocols: BN Host Protocol (configuration / display software) and BN TDI Protocol (System 1 condition monitoring & diagnostics software).

Bently Nevada 3500/22M

2. Applications & Purpose

Core Purpose

The 3500/22M is the nerve center and data exit port of a 3500 machinery protection rack. While the protection logic (alarms, trips, relay outputs) runs independently on the monitor cards and does not depend on the TDI, the TDI is what turns a standalone protection rack into a connected, diagnostically rich condition-monitoring system. It feeds continuous, phase-referenced vibration and speed data into Bently Nevada System 1 software for trend analysis, order tracking, balancing, and post-trip investigation.

Typical Equipment & Industries

• Power generation: steam turbines, gas turbines, generators.
• Oil & gas / petrochemical: centrifugal/axial compressors, large pumps.
• Heavy industry / pulp & paper / metallurgy: large fans, blowers, gearboxes, mills.
• Any critical rotating machine governed by API 670 machinery protection requirements.

Typical Data Flow

Proximity / seismic / Keyphasor sensors → M-series monitor cards (3500/40M, 42M, 50M, etc.) → 3500/22M TDI collects static + transient + waveform data over the backplane → Ethernet (copper or fiber) → System 1 / configuration PC → HMI displays trends, Bode plots, orbit plots, spectra; alarms and trips continue to be handled autonomously by the monitor cards and relay outputs.www.plcva.com

Bently Nevada 3500/22M

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