The Bently Nevada 3500/34 TMR Relay Module (comprising 125696-01 main cards and 125704-01 I/O module) is a Triple Modular Redundant (TMR) relay output system for the 3500 Machinery Protection System.
Item No :
25696-01+125704-01Order(MOQ) :
1 PiecePayment :
EXW/CIFProduct Origin :
USAShipping Port :
WuhanLead Time :
3-5daysWeight :
3kg| Specification | Description |
|---|---|
| Manufacturer | Bently Nevada (Baker Hughes) |
| System Family | 3500 Machinery Protection System |
| Product Type | TMR Relay Module (2 × 125696-01 + 1 × 125704-01) |
| Number of Relay Channels | 4 channels |
| Relay Configuration | 12 total relays (4 channel groups × 3 relays) |
| Voting Logic | 2-out-of-3 (2oo3) per channel |
| Relay Type | Three DPDT relays in SPST configuration |
| Contact Life | 100,000 cycles at 1.5 A, 24 Vdc, or 1 A, 120 Vac |
| Arc Suppressor | Not supported |
| Relay Operation | Normally Energized (NE) |
| Power Consumption | 9.6 W typical |
| LED Indicators | OK, TX/RX, CH ALARM (six LEDs for status communication) |
| Operating Temperature | -30°C to +65°C (-22°F to +150°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Humidity | 95%, non-condensing |
| Relay Module Dimensions | 120.4 mm × 24.6 mm × 241.8 mm |
| Relay Module Weight | 0.34 kg (0.74 lb) |
| I/O Module Dimensions | 241 mm × 24.4 mm × 99.1 mm |
| I/O Module Weight | 0.5 kg (1.0 lb) |
| Rack Space | 1 half-height front slot per relay module; 1 full-height rear slot for I/O module |
| Country of Origin | USA |
| Model | Description | Typical Application |
|---|---|---|
| 125696-01 | TMR Relay Module (half-height, main card) | Spare/replacement relay module |
| 125704-01 | TMR Relay I/O Module (full-height, 12 relays) | Spare/replacement I/O module |
| 3500/34-01-00 | Complete TMR Relay Module assembly | Safety-critical TMR protection systems |
| 3500/32M | 4-Channel Relay Module (SIL 2 capable) | Standard (non-TMR) relay applications |
| 149986-02 | Spare 4-Channel Relay Control Module | Front card for 3500/32M relay module |
| 125720-02 | Spare 4-Channel Relay I/O Module (hazardous/SIL) | SIL-certified and hazardous area applications |
Q1: What is the primary function of the 3500/34 TMR Relay Module?
It is a TMR relay output system that provides high-reliability relay outputs for safety-critical machinery protection. It uses three independent relays to drive a single relay output, working with a TMR Rack Interface Module and three monitor modules to provide 2-out-of-3 voting for inputs. This architecture ensures that a single component failure cannot disable critical equipment protection functions .
Q2: How does the TMR voting logic work?
Within a TMR rack, three monitors provide alarm signals via three separate data paths. The TMR Relay Module (125696-01) evaluates each path independently, generates three Alarm Contact Signals, and passes them to the TMR Relay I/O Module (125704-01). The I/O Module contains 12 relays arranged in four channel groups of three. For each channel, the three signals are fed to three separate relays, and the output is determined by 2-out-of-3 voting. If a data path's OK status is NOT OK, the corresponding alarm contact signal is invalidated .
Q3: What is the difference between the 125696-01 and the 125704-01?
The 125696-01 is the half-height TMR Relay Module (main card) that processes alarm logic and generates three independent alarm contact signals per channel. The 125704-01 is the full-height TMR Relay I/O Module that contains the 12 physical relays and executes the 2-out-of-3 voting to determine the final output state. Both are required together to form a complete 3500/34 TMR Relay Module .
Q4: What are the contact ratings for the 3500/34?
The relay contacts are rated for:
Maximum switched power: 60 W DC, 125 VA AC
Maximum switched current: 2 A
Maximum switched voltage: 150 Vdc, 220 Vac
Minimum switched current: 100 mA @ 5 Vdc
Contact life: 100,000 cycles
Q5: What are the typical applications for the 3500/34?
It is used in gas turbine protection systems, compressor emergency shutdown logic, high-integrity safety interlock systems, power generation machinery protection, and other critical rotating equipment applications where redundancy is required to prevent false trips and ensure reliable shutdown.
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