Bently Nevada 3500/33-04-00 149992-04 Low Current 16-Channel Failsafe Relay Output Module

Description

The Bently Nevada 3500/33-04-00 149992-04 is a 16-channel failsafe relay output module used as a main or spare module in 3500 machinery protection systems. It provides 16 independently programmable relay outputs with alarm drive logic, supporting AND/OR logic combinations of alert, danger, Not-OK statuses, and measured variables from any monitor channel. Each relay output can perform voting logic and integrates with the 3500 Rack Configuration Software.

This module interfaces with PLC, DCS, SIS, and TSI systems, offering both normally de-energized (ND) and normally energized (NE) operation selectable in four groups of four channels. Front-panel LEDs indicate module status, communication activity, and channel alarm states.

It supports low current switching applications with gold-plated contacts, suitable for standard, failsafe, or hazardous area configurations. Module compatibility includes installation to the right of the Transient Data Interface (TDI) in a 3500 rack.

Features

• 16 relay outputs with independent programmable logic
• Alarm drive logic using AND/OR conditions
• Selectable normally de-energized (ND) or normally energized (NE) operation
• Front-panel LEDs for OK, TX/RX, and channel alarm status
• Epoxy-sealed relays with arc suppressors (250 Vrms)
• Relay life up to 10,000 cycles
• Low current gold-plated contact option for 1 mA @ 1 Vdc minimum load
• Compatible with 3500 Rack Configuration Software

Applications

• Industrial machinery monitoring and protection
• Process automation alarm outputs
• Hazardous area relay interfacing
• Integration with PLC, DCS, SIS, TSI systems
• Low-current signal switching in control panels

Ordering Information

• 3500/33-04-00: Complete 16-Channel Relay Module Assembly
  • Specifies the pre-configured combination consisting of the front main module card and the rear low-current failsafe output board.
• -04: Output Module Type Option
  • Low Current 16-Channel Failsafe Relay Output Module featuring gold-plated contacts (Rear I/O Module Spare: 149992-04).
• -00: Hazardous Area Approval Option
  • No hazardous area agency approvals or certifications required.
• Spares & Accessories
  • Part Number 149992-04: Spare 16-Channel Low Current Failsafe Relay Output Module.

Technical Specifications

Connections/Interfaces

Installation Guidelines

Grounding and Shielding

Ensure the rack frame is properly tied to the plant instrumentation ground before inserting modules. Field wiring shields should be terminated at the designated shield terminals on the I/O module to minimize electromagnetic interference and ensure signal integrity.

Hazardous Area Precautions

Do not disconnect field wiring or module connections while the circuit is live unless the location is verified to be non-hazardous. Live handling in explosive atmospheres can result in arc-induced ignition risks.

Module Placement

Align the main module with the chosen front slot to the right of the TDI module. Slide it firmly into the backplane connectors and tighten the panel screws. Install the matching I/O module in the corresponding slot directly on the rear of the rack assembly.

FAQ

What does the 04 option signify in this module part number?

 The 04 code specifies that this is the Low Current 16-Channel Failsafe variant equipped with gold-plated contacts.

What is the minimum current rating for the gold-plated contact version?

The minimum switched current rating is 1 mA @ 1 Vdc.

Can I mix the configuration for Normally Energized and Normally De-energized modes?

Yes, the sixteen channels are split into four distinct groups of four channels, and each group is independently switch-selectable.

What is the purpose of the TX/RX LED on the front panel?

The TX/RX LED flashes to indicate active transmission and reception of communication data between this module and other rack modules.

Does this hardware package contain built-in spark protection for the contacts?

Yes, an internal 250 Vrms epoxy-sealed relay arc suppressor is standard equipment on the hardware channels.

Can this unit process individual variables from multiple monitor modules at once?

Yes, the Alarm Drive Logic can combine Alert, Danger, or Not-OK inputs from any monitor channel or combination of monitor channels within the rack.

What software tool is required to configure the voting logic pathways?

The system logic is engineered and uploaded using the 3500 Rack Configuration Software.

What happens to the relay operation if the module encounters an internal failure?

The Failsafe design ensures that when a major failure or loss of control occurs, the relays drop to their safe de-energized or default state depending on wiring.

Is it safe to exceed 5 mA when using an AC supply voltage up to 120Vac?

No, currents exceeding 5 mA on these low-current gold relays will degrade or permanently damage the contact plating.

How many slots does the complete main and I/O assembly take up?

It occupies one full-height slot on the front of the rack and one corresponding full-height slot on the rear panel.

Can I plug this module into the slot immediately adjacent to the power supply?

It must be placed in any available slot situated to the right of the Transient Data Interface module.

What does a solid light on the OK LED indicate?

A solid light confirms that the hardware is powered up, has passed initial self-tests, and is operating properly.