Introduction
The 3500/50 134938-01 is a Quad-Channel Relay / TTL Interface Module designed for the Bently Nevada 3500 Machinery Protection System. This module acts as a critical link between the monitoring system and external control or annunciation devices. It receives commands (trip or alert signals) from other monitoring modules within the 3500 rack and converts them into independent, physically isolated relay contact outputs or TTL-level logic signals. Its primary function is to execute actions such as machinery shutdown, activating alarms, or sending status signals to a plant's Distributed Control System (DCS) or PLC, thereby enabling automated protective responses to machine fault conditions.
Parameters / Specifications
The key technical parameters of the 3500/50 134938-01 module are as follows:
| Parameter Category | Specification |
|---|---|
| Part Number | 134938-01 |
| Module Type | 3500/50 Quad-Channel Relay / TTL Interface |
| Number of Channels | 4 independent channels |
| Output Type | Form C Relay Contacts (SPDT - Single Pole Double Throw) and TTL-compatible logic signals per channel. |
| Relay Contact Rating | Typically 2 Amps resistive @ 30 VDC or 125 VAC. |
| TTL Output | Logic High: +5 VDC (nominal); Logic Low: 0-0.8 VDC. |
| Power Supply | Powered directly from the 3500 rack (typically +5 VDC and ±15 VDC). |
| Isolation | 500 Vrms minimum between channel outputs, and from system power. |
| LED Indicators | Per channel: Red LED for relay energized/alert state. |
| Communication | Configurable via the 3500 Framework software. Communicates over the rack's backplane. |
| Dimensions (H x W x D) | Approximately **** |
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Height: 195 mm (7.7 in) – Standard 3500 rack module height. Width: 27 mm (1.06 in) – Standard single-slot width. Depth: 170 mm (6.7 in).** |
| Weight | Approximately 0.45 kg (1.0 lb). |
| Operating Temperature | 0 to 65 °C (32 to 149 °F). |
| Mounting | Installs in any slot (except Slot 1/Controller slots) of a 3500 rack. |
Application Scenarios
The 3500/50 module is deployed in critical industrial rotating machinery applications where reliable output signals for protection and control are essential. Typical scenarios include:
Machine Trip / Shutdown: The most critical application. When a vibration, speed, temperature, or other parameter exceeds a dangerous setpoint, the monitoring module (e.g., 3500/42) commands the 3500/50 to energize a relay. This relay contact directly or indirectly breaks the circuit to the turbine's or compressor's emergency shutdown valve, initiating a safe machine shutdown.
Alarm Annunciation: For less severe but cautionary conditions (e.g., "Alert" level), a separate channel can be configured to energize a relay that activates warning lights, audible alarms, or messages on an operator's console, prompting investigative action.
DCS / PLC Interface: The relay contacts or TTL signals provide a hardwired, isolated status input to the plant's main control system. This allows the DCS to log events, display machine status, or initiate sequenced shutdown procedures.
Auxiliary Control Logic: The outputs can be used to start or stop auxiliary equipment based on machine state. For example, initiating a lube oil pump on standby or activating a purge system.
Redundant Protection Schemes: Multiple channels can be configured for voting logic (e.g., 2-out-of-3) to increase shutdown system reliability and prevent spurious trips, commonly used in gas turbines and critical compressors.
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