High-Reliability Relay Control for Triple Modular Redundant Systems
The Bently Nevada 3500/34 TMR Relay Module provides exceptional reliability for mission-critical machinery protection systems that demand high availability and fault tolerance. Designed for Triple Modular Redundant (TMR) configurations, this module works seamlessly with the 3500 Rack Interface Module (RIM) and multiple monitor modules to deliver 2-out-of-3 voting logic for input signals. It ensures precise control and safe operation in applications that require continuous uptime, similar to safety instrumented systems defined by ISA S84.01-1996.
Reliable Performance with Redundant Architecture
The 3500/34 TMR Relay Module includes two main components: the TMR Relay Module and the TMR Relay I/O Module. Both operate in parallel to guarantee redundancy and stable performance. Each relay channel uses Alarm Drive Logic, programmable through the 3500 Rack Configuration Software, allowing flexible combinations of alarm inputs using AND and OR logic. This configuration enhances fault detection, providing intelligent relay control across multiple rack channels.
Functional Design
- The TMR Relay Module manages three independent alarm contact signals for each of the four relay channels.
- Each channel processes alarm signals from three monitors through separate data paths, ensuring data integrity.
- The TMR Relay I/O Module includes twelve relays organized in four groups, each performing 2-out-of-3 relay voting.
- When one data path reports a fault, the system automatically maintains operational reliability by relying on the remaining two valid paths.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Bently Nevada |
| Model | 3500/34 |
| Product Type | TMR Relay Module |
| Series | 3500 Machinery Protection System |
| Power Consumption | 9.6 W (typical) |
| Relay Type | 3 DPDT relays in SPST configuration |
| Contact Life | 100,000 cycles @ 1.5 A, 24 VDC or 1 A, 120 VAC |
| Operation Mode | Normally Energized |
| Arc Suppression | Not supported |
| Relay Contact Ratings | Max switched power: 60 W (DC), 125 VA (AC) Max switched current: 2 A Max voltage: 150 VDC / 220 VAC Min switched current: 100 mA @ 5 VDC |
| LED Indicators | 6 total (OK, TX/RX, CH ALARM) |
| Environmental Limits | Operating: -30°C to +65°C Storage: -40°C to +85°C Humidity: 95% non-condensing |
| Rack Space Requirements | 1 half-height front slot (Relay Module), 1 full-height rear slot (I/O Module) |
| Compatibility | Works with TMR Rack Interface Module and M-series monitors |
Dimensions and Weight
| Component | Dimensions (H × W × D) | Weight |
|---|---|---|
| Relay Module | 120.4 × 24.6 × 241.8 mm (4.74 × 0.97 × 9.52 in) | 0.34 kg (0.74 lb) |
| I/O Module | 241 × 24.4 × 99.1 mm (9.50 × 0.96 × 3.90 in) | 0.50 kg (1.0 lb) |
Product Origin
- Manufactured in: USA
Application Overview
Engineers use the Bently Nevada 3500/34 TMR Relay Module in high-availability machinery protection systems that require rapid response and continuous monitoring. The module ensures that alarm logic executes correctly even during partial component failure, providing true redundancy and operational security. Its modular design simplifies integration with 3500 racks, supporting advanced logic programming and easy maintenance without disrupting system operation.
Key Advantages
- Provides 2-out-of-3 relay voting for safety-critical control
- Supports AND/OR logic for flexible alarm programming
- Maintains stable operation during module or channel faults
- Built for harsh industrial environments with wide temperature tolerance
- Designed for long operational life and minimal downtime
Details
| Weight | 0.34 kg |
|---|---|
| Dimensions | 120.4 × 24.6 × 241.8 mm |
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