Description

Bently Nevada 3300/01 System Monitor Module

Configured for system diagnostics, Keyphasor signal distribution, and rack-level control functions in the Bently Nevada 3300 Machinery Protection System, the Bently Nevada 3300/01 (3300/01 System Monitor Module) provides direct physical and electrical execution. The module occupies the second rack slot from the left, interfaces with rack power and backplane circuits, processes up to two Keyphasor inputs, and supports optional serial communication functions for supervisory systems and data acquisition platforms.

Hardware Specifications

Parameter	Specification
Model	3300/01
Brand	Bently Nevada
Origin	Not specified
Product Type	System Monitor Module
Rack Position	Second slot from left, adjacent to power supply module
Power Consumption	Nominal 3.6 W (with serial interface option)
Power Source	Regulated DC power from 3300 rack backplane
Keyphasor Inputs	Up to 2 proximity transducer inputs
Keyphasor Frequency Range	60 to 30,000 cpm (1 Hz to 500 Hz)
Minimum Input Amplitude	0.5 Vp-p
DC Signal Range	0 to -24 VDC or 0 to -18 VDC
Buffered Outputs	4 front-panel Keyphasor outputs
Output Impedance	50 Ohm
Dynamic Signal Accuracy	+/-0.3% of full scale typical
Phase Accuracy	+/-0.2 degrees typical at 25 degC
RPM Accuracy	+/-1 rpm typical
Communication Interfaces	RS-232 or RS-422 (optional)
Supported Protocols	Modbus RTU, SDI, DDI
Maximum Baud Rate	19.2 kbaud (RS-232), 38.4 kbaud (RS-422)
Operating Temp	-20 degC to +70 degC
Storage Temp	-40 degC to +85 degC
Relative Humidity	Up to 95% non-condensing
Weight	Approximately 0.6 kg to 0.7 kg
Dimensions	Approximately 5.1 cm x 20.3 cm x 33.0 cm
Front Panel Functions	RESET, UP/DOWN setpoint adjustment
Rear Terminal Functions	Rack Inhibit, Trip Multiply, Remote Alarm Reset

Eddy-Current Probe Interface and Rotor Dynamic Signal Distribution

The 3300/01 module accepts Keyphasor signals generated by proximity probe systems and distributes phase-reference information through the rack backplane. Signal conditioning supports rotational speed measurements from 1 Hz to 500 Hz while maintaining phase accuracy for vibration, position, and rotor dynamic monitoring functions.

For installations using eddy-current proximity transducers, probe system validation commonly includes verification of probe gap voltage against the target surface. During commissioning, signal integrity should be confirmed before Keyphasor references are utilized by rack-mounted monitoring modules. The front-panel buffered outputs provide direct access to conditioned Keyphasor signals for diagnostic instrumentation and waveform verification.

Frequently Asked Questions

Q: Does the 3300/01 support hot replacement while the rack is energized?
A: The supplied documentation does not specify hot-swap capability. Module replacement procedures should follow the applicable 3300 system maintenance instructions and site isolation requirements.

Q: How many Keyphasor reference signals can the module process?
A: The module accepts up to two Keyphasor inputs and distributes the reference information through the rack backplane for use by compatible monitoring modules.

Q: What communication options are available on the 3300/01?
A: Optional communication boards provide RS-232 or RS-422 interfaces supporting Modbus RTU and Bently Nevada SDI/DDI communication protocols for host-system integration.

Field Installation Guidelines

• Install the module only in the designated System Monitor position immediately to the right of the rack power supply.
• Verify all rack supply voltages through the front-panel and internal status indicators before commissioning connected monitor modules.
• Route Keyphasor signal cables separately from high-energy power conductors to minimize induced electrical noise.
• Maintain proper shield termination practices according to plant grounding standards and proximity transducer installation requirements.
• Confirm correct operation of Rack Inhibit, Trip Multiply, and Remote Alarm Reset wiring before placing the machinery protection system into service.
• Use the front-panel buffered Keyphasor outputs when validating phase-reference quality, rotational speed signals, or diagnostic measurements.
• Inspect communication interface settings and protocol configuration before connecting supervisory computers, PLCs, or monitoring software.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems