The Bently Nevada 125696-01 is a TMR (Triple Modular Redundant) Relay Module for the 3500 series machinery protection system. Each of the four relay channels includes programmable Alarm Drive Logic using AND/OR combinations of Alert, Danger, Not-OK, or individual PPL statuses from any monitor channel in the rack.
Item No :
3500/34-01-00Order(MOQ) :
1 PiecePayment :
EXW/CIFProduct Origin :
USAShipping Port :
WuhanLead Time :
3-5daysWeight :
3kg| Specification | Description |
|---|---|
| Manufacturer | Bently Nevada (Baker Hughes) |
| Model | 125696-01 |
| Product Family | 3500 Machinery Protection System |
| Product Type | TMR Relay Module (Half-Height) |
| Compatible System | 3500 TMR (Triple Modular Redundant) racks |
| Number of Relay Channels | 4 |
| Redundancy Architecture | Triple Modular Redundant (TMR), 2-out-of-3 voting |
| Relay Configuration | Three DPDT relays in SPST configuration per channel |
| 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 |
| Dimensions (H x W x D) | 120.4 mm x 24.6 mm x 241.8 mm |
| Weight | 0.34 kg (0.74 lb) |
| Rack Space | 1 half-height front slot (per relay module) |
| Companion I/O Module | 125704-01 (TMR Relay I/O Module) |
| Country of Origin | USA |
| Lifecycle Status | Active / Available as New Surplus |
| Model | Description | Typical Application |
|---|---|---|
| 125696-01 (this model) | TMR Relay Module (half-height, main card) | 2oo3 voting relay logic for TMR systems |
| 125704-01 | TMR Relay I/O Module (full-height) | Contains 12 relays for 2oo3 voting |
| 129771-01 | TMR Relay Module User Guide | Documentation for 3500/34 configuration |
| 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 |
Q1: What is the primary function of the 125696-01?
It is a TMR Relay Module that provides high-reliability relay outputs for safety-critical machinery protection applications. 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 evaluates each path independently, generates three Alarm Contact Signals, and passes them to the TMR Relay I/O Module. 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 3500/32M?
The 125696-01 is the TMR version designed for the highest availability applications, using three independent relays and 2oo3 voting. The 3500/32M is a standard 4-channel relay module for non-TMR applications. The TMR version is required when the rack is configured for triple redundancy.
Q4: What are the contact ratings for the 125696-01?
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 125696-01?
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.
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