Overview
The 3500/33 16-Channel Relay Module, a full-height module from Bently Nevada (a Baker Hughes business), is designed for machinery condition monitoring systems. It provides 16 independently programmable relay outputs, enabling flexible integration into 3500 rack architectures. The module can be installed in any slots to the right of the Transient Data Interface (TDI) Module, supporting versatile system configurations.
Each relay output features customizable voting logic and Alarm Drive Logic, which can be programmed using AND/OR logic with inputs such as alarming statuses (alert, danger), Not-OK signals, and measured variables from monitor channels. Programming is performed via the 3500 Rack Configuration Software.
Key Features
16 Independent Relay Outputs: Each channel supports programmable voting logic for tailored monitoring needs.
Alarm Drive Logic: Configurable with AND/OR logic, utilizing alarming inputs, Not-OK signals, and measured variables from the rack.
Status Indicators: Front-panel LEDs (OK, TX/RX, CH Alarm) provide real-time operational feedback:
OK LED: Illuminates during normal operation.
TX/RX LED: Flashes during communication with other 3500 modules.
CH Alarm LED: Activates when a relay channel is in alarm.
Relay Specifications: Single-pole Double-throw (SPDT) relays with epoxy sealing, standard 250 Vrms arc suppressors, and a contact life of 10,000 cycles. Four groups of four channels are switch-selectable for Normally De-energized (ND) or Normally Energized (NE) operation.
Technical Specifications
Electrical
Power Consumption: 5.8 watts (typical).
Relay Contact Ratings (Standard Systems):
DC (Resistive Load): Max 5 A current, 125 Vdc voltage, and 70 W power (24 Vdc).
AC (Resistive Load): Max 5 A current, 250 Vac voltage, and 1200 VA power.
Low Current Relays (Gold-plated Contacts): Min 1 mA @ 1 Vdc, max 100 mA @ 48 Vdc (DC resistive load).
PhysicalMain Module Dimensions: 241 mm x 24.4 mm x 242 mm (9.50 in x 0.96 in x 9.52 in); Weight: 0.7 kg (1.6 lb).
I/O Module Dimensions: 241 mm x 24.4 mm x 99.1 mm (9.50 in x 0.96 in x 3.90 in); Weight: 0.4 kg (1.0 lb).
Rack Requirements: 1 full-height front slot (main module); 1 full-height rear slot (I/O module).
Compliance & Certifications
FCC: Complies with Part 15 of FCC Rules, ensuring no harmful interference and acceptance of received interference.
EMC: Adheres to EU EMC Directive 2014/30/EU, meeting EN 61000-6-2 (immunity) and EN 61000-6-4 (emissions) standards.
Electrical Safety: Complies with EU LV Directive 2014/35/EU and EN 61010-1.
Hazardous Area Approvals: Includes ATEX/IECEx (II 3 G Ex nA nC ic IIC T4 Gc) and cNRTLus (Class I, Division 2) for Zone 2 environments.
Ordering Information
The module is ordered as 3500/33 AA-BB, where:
AA (Output Module):
01: 16-Channel Relay Output Module
02: 16-Channel Failsafe Relay Output Module
03: Low Current 16-Channel Relay Output Module
04: Low Current 16-Channel Failsafe Relay Output Module.
BB (Hazardous Area Approval):
00: None
01: cNRTLus (Class 1, Division 2)
02: ATEX / IECEx / CSA (Class 1, Zone 2).
Spares: Include 149986-01 (Relay Control Module) and 149992-01 to -04 (Relay Output Modules).
Installation & Operation Notes
Requires 3500 Rack Config (v3.3+), Data Acquisition Software (v2.40+), and Data Display Software (v1.40+).
Hazardous area-approved modules (-02 option) are voltage-limited due to spacing requirements; higher voltages violate certifications.
For functional safety (SIL) systems, restricted voltages apply; higher voltages are prohibited.