Product Description

The Bently Nevada 87890-01 System Monitor Module provides continuous supervisory control for 3300/03 and selected 3500 machinery protection racks. Its primary role is to evaluate overall rack health, manage alarm functions, and coordinate communication between installed modules and external control systems. Moreover, its reliable monitoring ensures that operators receive timely diagnostic information to prevent unplanned shutdowns.

Engineers use this module as the central authority within a protection rack because it validates power conditions, verifies module operation, and distributes alarm logic across the system. In addition, its rugged construction and stable performance make it a dependable choice for critical rotating equipment such as turbines, compressors, pumps, and industrial motors.

Technical Specifications

General
Model Number: 87890-01
Product Type: System Monitor Module
Series Compatibility: 3300/03 and selected 3500 systems

Functions
Supervision: Health checking of installed rack modules
Alarm Management: Alert and Danger outputs
Communication: ModuleBus backplane interface

Electrical
Power Supply: 18–36 VDC or 85–264 VAC (rack dependent)
Relay Outputs: Alert and Danger
Relay Type: SPDT electromechanical
Contact Rating: 5 A at 30 VDC or 250 VAC
Relay Settings: Latching / non-latching, energized / de-energized

Environmental
Operating Temperature: –30 °C to +65 °C
Storage Temperature: –40 °C to +85 °C
Weight: 2.8 kg

Additional Information
Manufacturer: Bently Nevada
Country of Origin: USA

FAQ

Q1: What is the primary function of the 87890-01 System Monitor Module?
It supervises rack health, manages alarm functions, and coordinates communication across installed modules.

Q2: Is this module compatible with the 3300 Series?
Yes. It is designed for 3300/03 racks and can operate with selected 3500 configurations.

Q3: What alarm outputs does it provide?
It includes configurable Alert and Danger relay outputs for system-wide protection.

Q4: Does the module support both AC and DC power?
Yes. It supports 18–36 VDC or 85–264 VAC depending on rack configuration.

Q5: Can it be used in high-vibration industrial environments?
Yes. It is built for continuous operation in demanding environments such as turbines and compressors.