Technical Specifications

FAQ

1. What is the main function of the Bently Nevada 3500/32-01-CN?
The 3500/32-01-CN is a four-channel relay module designed for the Bently Nevada 3500 machinery protection system. Its primary function is to convert alarm conditions generated by monitor modules within the 3500 rack into relay outputs that can be used by external control, alarm, shutdown, or annunciation systems. Each of the four relay channels can be independently programmed according to the requirements of the application. This allows the module to respond to Alert, Danger, or other configured alarm conditions and provide a physical relay output to external equipment.

2. How many relay outputs does the 3500/32-01-CN provide?
The 3500/32-01-CN provides four independent relay channels. Each channel can be configured to perform the required alarm drive logic, allowing different alarm conditions from the 3500 rack to control individual relay outputs. The module supports AND and OR voting logic, which provides flexibility when combining alarm information from multiple monitor channels. This makes the relay module suitable for applications where machinery protection information needs to be passed to external control or shutdown systems without requiring every external circuit to directly process the monitor data.

3. Can the relay channels of the 3500/32-01-CN be configured independently?
Yes. Each relay output can be independently programmed according to the required application logic. The alarm drive logic can use alarm information from monitor channels in the 3500 rack and can be configured using AND and OR logic. This allows the relay channels to perform different functions, such as driving separate alarm indicators, transmitting individual machine conditions, or combining multiple alarm states into a single external control signal. Configuration is performed through the 3500 Rack Configuration Software, allowing the relay behavior to be matched to the machinery protection strategy.

4. What is the difference between Normally Energized and Normally De-energized operation?
Each relay channel of the 3500/32 can be switch-selected for Normally Energized or Normally De-energized operation. In a Normally Energized arrangement, the relay is energized during its normal operating state and changes state when the configured condition occurs or when the module loses the required operating condition. In a Normally De-energized arrangement, the relay remains de-energized during normal operation and energizes when the configured logic requires an output. The appropriate configuration depends on the external control philosophy, fail-safe requirements, alarm strategy, and the way the connected equipment is expected to respond to a relay state change.

5. What do the OK, TX/RX, and CH ALARM LEDs indicate?
The 3500/32-01-CN uses several LED indicators to assist with operation and troubleshooting. The OK LED indicates that the module is functioning properly. The TX/RX LED flashes to indicate communication activity between the relay module and other modules within the 3500 rack. The CH ALARM LEDs provide channel-specific indication when the corresponding relay channel is in an alarm state. These indicators allow maintenance personnel to quickly determine whether the module is healthy, communicating with the rack, and currently responding to an alarm condition without immediately relying on external measurement equipment.

6. What should be checked if a relay output does not operate as expected?
Troubleshooting should begin by checking the module’s OK and TX/RX indicators to determine whether the relay module is operating correctly and communicating with the 3500 rack. The configured alarm logic should then be reviewed using the 3500 Rack Configuration Software to verify that the correct monitor channels and alarm conditions are assigned to the relay output. The relay’s Normally Energized or Normally De-energized selection should also be checked because an incorrect setting can make the output appear to operate in the opposite manner. External wiring, relay contacts, terminal connections, and the condition of the connected control circuit should also be inspected. If the software configuration and external wiring are correct, further testing should focus on the relay channel and associated 3500 rack hardware.

7. Can the 3500/32-01-CN be used for Triple Modular Redundant applications?
The standard 3500/32 four-channel relay module is intended for conventional 3500 machinery monitoring and relay output applications. For applications that specifically require Triple Modular Redundant architecture, Bently Nevada specifies the 3500/34 TMR Relay Module instead. The 3500/34 is designed specifically for TMR relay applications and should be selected when the system architecture requires redundant relay functionality. Therefore, the 3500/32-01-CN should not be treated as a direct substitute for the 3500/34 in a TMR protection design.

8. How is the 3500/32-01-CN integrated into a Bently Nevada 3500 rack?
The 3500/32-01-CN is a full-height module installed in the 3500 rack to the right of the Rack Interface Module. It receives alarm and status information from the monitoring modules through the rack backplane and uses its programmed alarm drive logic to control the four relay channels. The resulting relay contacts can then be connected to external annunciators, control systems, shutdown circuits, or other equipment according to the machinery protection design. During commissioning, the module should be correctly installed in the rack, the relay logic should be configured through the 3500 Rack Configuration Software, and each output should be tested against the intended alarm conditions before the machinery protection system is placed into service.