3500/32-01-01-00 | Bently Nevada | 4-Channel Relay Module

The Bently Nevada 3500/32-01-01-00 is a 4-Channel Relay Module designed for the 3500 Machinery Protection System. It provides four independently configurable relay outputs for external alarm signaling and equipment control. Furthermore, its programmable AND/OR logic allows users to combine monitor alarm conditions and assign specific relay actions. The module supports normally energized and normally de-energized operation.

Key Features

• Four independent programmable relay channels.
• SPDT relay contacts with a DPDT arrangement using two SPDT relays.
• Configurable AND/OR logic for processing monitor alarm conditions.
• Relay activation based on Alert, Danger, Not-OK, and other configured monitor states.
• Selectable Normally Energized (NE) and Normally De-energized (NDE) operation.
• Front-panel OK, TX/RX, and CH ALARM status indicators.
• Configuration through 3500 Rack Configuration Software.
• Epoxy-sealed relays with an integrated arc suppression circuit.

Technical Specifications

Relay Logic and Configuration

Each of the four relay channels operates independently according to its assigned alarm logic. Using 3500 Rack Configuration Software, users can select monitor channel conditions and combine multiple inputs through AND or OR logic. Therefore, a relay can respond to an individual alarm or a combination of specified monitoring conditions.

In addition, users can select Normally Energized (NE) or Normally De-energized (NDE) operation for each relay channel. This setting determines the relay coil state under normal operating conditions and affects how the external circuit responds to a change in the configured logic state.

Relay Contacts and Electrical Ratings

The module provides four relay outputs for switching external alarm and control circuits. Each output can operate an annunciator, initiate an interlocking signal, or control an external circuit according to its assigned monitoring conditions.

Furthermore, the integrated arc suppression circuit helps limit electrical arcing during contact switching. The specified contact life is 100,000 cycles at 5 A with a 24 VDC or 120 VAC load. Meanwhile, the maximum switched current, voltage, and power ratings must be considered together when selecting the connected load.

The minimum switching requirement is 10 mA at 5 VDC. These contact ratings apply to resistive loads; inductive loads may require additional consideration because switching characteristics and contact life depend on the connected circuit.

Status Indication and Rack Installation

Three front-panel indicators provide operating and communication information:

• OK: Indicates the module's operating health.
• TX/RX: Indicates communication activity with the 3500 rack.
• CH ALARM: Indicates a relay channel alarm condition.

The module communicates with other 3500 system components through the rack backplane. It occupies a full-height module position in the slots to the right of the Rack Interface Module (RIM).

Frequently Asked Questions

Q: Can the four relay channels use different alarm conditions?

A: Yes. Each channel can have its own relay logic configuration. Users can assign individual monitor conditions or combine multiple conditions using programmable AND/OR logic.

Q: What is the difference between Normally Energized and Normally De-energized operation?

A: Normally Energized operation keeps the relay coil energized under its configured normal operating condition. Normally De-energized operation keeps the coil de-energized under that condition. The selected mode determines the relay's contact behavior when the configured alarm logic changes state.

Q: Can the 3500/32-01-01-00 be used in Triple Modular Redundant applications?

A: No. The standard 3500/32 is not the designated relay module for TMR configurations. The 3500/34 TMR Relay Module is specified for these applications.