3500/33-01-00 16-Channel Relay Module

Introduction to the 3500/33-01-00

When your rotating machinery protection system needs dependable alarm and trip outputs, the 3500/33-01-00 from Bently Nevada provides a robust solution. This 16-channel relay module is designed for seamless integration into the 3500 rack, offering a compact, front-accessible form factor that simplifies wiring and maintenance.

As a 16-channel relay output module, the 3500/33-01-00 translates internal monitoring decisions into physical relay contacts that can drive external annunciators, control logic, or shutdown circuits. Its epoxy-sealed relays and built-in arc suppressor enhance reliability in industrial environments, while the front-panel LEDs give you immediate visual status of module health, communication, and channel alarms.

Key Features and Technical Specifications

The 3500/33-01-00 is engineered with precision, and every specification reflects its role in critical machinery protection. Below are the essential parameters you can rely on:

• Relay Type: Single-pole, double-throw (SPDT) — provides both normally open and normally closed contacts for flexible wiring.
• Relay Operation: Four groups of four channels are switch-selectable for Normally De-energized (ND) or Normally Energized (NE) operation, allowing you to configure fail-safe behavior.
• Relay Contact Life: Rated for 10,000 cycles, ensuring long-term mechanical endurance.
• Relay Environmental Sealing: Epoxy-sealed — protects contacts from dust, moisture, and corrosive atmospheres.
• Relay Arc Suppressor: 250 Vrms installed as standard — reduces contact arcing and extends relay life.
• Power Consumption: 5.8 watts typical — low power draw for efficient rack operation.
• Dimensions (Main Module): 241 mm x 24.4 mm x 242 mm (9.50 in x 0.96 in x 9.52 in) — fits one full-height front slot.
• Weight: 0.7 kg (1.6 lb) — lightweight and easy to handle.

For contact ratings, the standard relays handle a minimum switched current of 100 mA @ 5 Vdc, and a maximum switched current of 5 A for both DC and AC resistive loads. Maximum switched voltage is 125 Vdc or 250 Vac, with maximum switched power of 70 W @ 24 Vdc, 10 W @ 48 Vdc, 9 W @ 60 Vdc, and 1200 VA for AC. These ratings give you clear boundaries for safe operation.

Installation and Setup

Installing the 3500/33-01-00 is straightforward. The main module occupies one full-height front slot in the 3500 rack, while the associated I/O module occupies one full-height rear slot. Ensure the rack is powered down before insertion to avoid any electrical hazard.

Field wiring connects to the rear I/O module, where relay contacts are available. Because conductors may be exposed when wiring, always follow the warning label: disconnect power before servicing and never disconnect while the circuit is live unless the area is known to be non-hazardous. Consult the Bently Nevada manual for detailed wiring diagrams and torque specifications.

Maintenance and Reliability

Regular inspection is key to maintaining the 3500/33-01-00's performance. Periodically verify that all front-panel LEDs operate correctly: the OK LED should be illuminated when the module is functioning properly, the TX/RX LED should flash during communication, and the CH Alarm LED should light when a relay channel is in an alarm state.

Because the relays are epoxy-sealed, they are protected from environmental contaminants, reducing the need for contact cleaning. However, you should still verify relay operation by testing each channel according to your plant's preventive maintenance schedule. The arc suppressor helps extend contact life, but after many switching cycles, contacts may eventually wear—plan for periodic replacement based on your application's duty cycle.

Compatibility and Integration

The 3500/33-01-00 is designed specifically for the Bently Nevada 3500 monitoring system. It communicates with other modules in the 3500 rack via the internal backplane, as indicated by the TX/RX LED. This integration allows you to use the relay module to output alarms or trips based on vibration, temperature, or other monitored parameters.

Since the module is part of the 3500 family, it is compatible with standard 3500 rack configurations. For specific system integration details, refer to the official Bently Nevada documentation or contact AutoDCSTech for assistance.

Troubleshooting Common Issues

If the OK LED is not illuminated, the module may not be seated properly or may have an internal fault. Check that it is fully inserted into the rack and that the rack is powered. If the TX/RX LED is not flashing, communication with other modules may be interrupted—verify backplane connections.

If a CH Alarm LED is on but the corresponding relay does not change state, check the relay operation switch settings (ND vs. NE) and the field wiring. Also, ensure the switched load is within the minimum and maximum contact ratings—for example, the minimum switched current is 100 mA @ 5 Vdc for standard relays. If your application uses low-current signals, consider the special low-current relay option, which supports 1 mA @ 1 Vdc minimum.

Product Support and Availability

The 3500/33-01-00 is available from AutoDCSTech, an industrial automation parts supplier. Please verify current lifecycle status and availability with AutoDCSTech before ordering, as product status may change. For technical support, consult the official Bently Nevada documentation or contact our team for assistance.