3300/12-01-20-00 | Bently Nevada 95-125 Vac Power Supply

Introduction to the Bently Nevada 3300/12-01-20-00

When your monitoring system demands steady, dependable power, the 3300/12-01-20-00 from Bently Nevada is engineered to deliver. This ac power supply converts either 95 to 125 Vac or 190 to 250 Vac into the dc voltages your rack-mounted monitors need. Because it supports up to 12 monitors, it simplifies your rack layout and reduces the need for additional power units.

Installed in the left-most position (position 1) of a 3300 rack, this power supply is a fundamental building block for reliable vibration monitoring. Its field-changeable input voltage option adds flexibility, letting you adapt the unit to your facility's electrical supply. With a built-in line noise filter, it helps protect sensitive monitoring electronics from electrical interference.

Key Features and Technical Specifications

The 3300/12-01-20-00 offers a range of specs that directly impact your system's performance and cost of ownership. Here are the essential parameters:

• Input Power: 95 to 125 Vac, single phase, 50 to 60 Hz, at 1.0 A maximum, or 190 to 250 Vac, single phase, 50 to 60 Hz, at 0.5 A maximum.
• Surge at Power-Up: 26 A peak, or 12 A rms, for one cycle.
• Fuse Ratings: 1.5 A slow blow for 95 to 125 Vac; 0.75 A slow blow for 190 to 250 Vac.
• Transducer Power: User-programmable -24 Vdc, +0%, -2.5%; or -18 Vdc, +1%, -2% (internal to rack).
• OK Relay: Single-pole, double-throw (SPDT), hermetically sealed, normally energized.
• Contact Ratings: 5 A at 28 Vdc; 5 A at 120 Vac, 50/60 Hz; 3 A at 220 Vac, 50/60 Hz.
• Contact Life: 10,000 cycles minimum at rated load.
• Operating Temperature: 0°C to +65°C (+32°F to +150°F).
• Storage Temperature: -40°C to +85°C (-40°F to +185°F).
• Relative Humidity: To 95%, noncondensing.

One distinctive feature is the user-programmable transducer voltage. This allows you to match the power supply output to your specific transducer requirements, potentially reducing the need for external converters. That flexibility translates into lower installation costs and simpler inventory management.

Real-World Applications and Cost Benefits

In industrial settings, uptime is money. The 3300/12-01-20-00 supports up to 12 monitors, which means you can consolidate power distribution in a single rack. This reduces the number of power supplies you need to purchase, install, and maintain. Additionally, the line noise filter helps prevent false readings and equipment damage, cutting down on costly troubleshooting and repairs.

For example, in a rotating machinery monitoring application, this power supply ensures that vibration monitors receive stable power, so you can detect issues early and avoid unplanned downtime. The hermetically sealed OK relay provides a reliable status signal, and its normally energized operation means you get a clear indication if power is lost. This proactive alerting can save thousands in potential production losses.

Installation and Setup

Installing the 3300/12-01-20-00 is straightforward. Mount it in the left-most slot (position 1) of your 3300 rack. Before powering up, verify the input voltage option matches your facility's supply. The unit ships with a factory-set option (01 = 95-125 Vac), but you can change it in the field via a soldered jumper and external fuse replacement. Always follow the manufacturer's instructions for these adjustments.

When connecting the power supply, ensure the rack is properly grounded and that all connections are secure. The line noise filter is built-in, so no additional filtering is needed. For systems requiring ATEX approval, remember that the monitor rack must be installed in a weatherproof housing—this is a key consideration for hazardous environments.

Maintenance and Reliability

To maximize the lifespan of your 3300/12-01-20-00, periodic inspection is recommended. Check the fuse condition and replace it with the correct rating (1.5 A slow blow for 95-125 Vac, 0.75 A slow blow for 190-250 Vac). Verify that the OK relay operates correctly by simulating a power loss. Also, keep the unit within its operating temperature range (0°C to +65°C) and avoid condensation by maintaining relative humidity below 95%.

Because the unit is hermetically sealed, it is protected from dust and moisture, reducing maintenance frequency. The contact life of 10,000 cycles ensures long-term reliability, minimizing replacement costs. By following a simple maintenance routine, you can extend the service life and avoid unexpected failures.

Compatibility and Integration

The 3300/12-01-20-00 is designed specifically for Bently Nevada 3300 rack systems. It powers up to 12 monitors and their associated transducers, making it a central component in your monitoring architecture. The power supply's output voltages (-24 Vdc or -18 Vdc) are compatible with Bently Nevada transducers, and the OK relay provides a dry contact for integration with your control system or alarm annunciator.

When integrating, ensure that the total current draw of your monitors does not exceed the supply's capability. The unit's input power options (95-125 Vac or 190-250 Vac) allow it to work with common industrial power grids. For specific compatibility details, refer to the Bently Nevada 3300 system manual.

Troubleshooting Common Issues

If your 3300/12-01-20-00 fails to power up, first check the input fuse. A blown fuse often indicates an overcurrent condition or a short circuit in the rack. Verify that the input voltage matches the unit's configuration. If the OK relay is not energized, check the relay contacts and the power supply output.

Another common issue is voltage fluctuation. If you notice unstable dc output, inspect the line noise filter and ensure the input power is within the specified range. For persistent problems, consult the Bently Nevada documentation or contact Petro Auto Tech for technical support.

Frequently Asked Questions

Q: What is the input voltage range for the 3300/12-01-20-00?

A: The unit accepts 95 to 125 Vac or 190 to 250 Vac, single phase, 50 to 60 Hz.

Q: Can I change the input voltage option in the field?

A: Yes, the input voltage option is field-changeable via a soldered jumper and external fuse replacement.

Q: What are the transducer power output options?

A: The unit provides user-programmable -24 Vdc or -18 Vdc, with specific tolerances.

Q: What is the operating temperature range?

A: The operating temperature is 0°C to +65°C (+32°F to +150°F).

Q: How many monitors can this power supply support?

A: It can power up to 12 monitors and their associated transducers.

Product Support and Availability

The 3300/12-01-20-00 is available through Petro Auto Tech, your trusted industrial automation parts supplier. We ensure genuine Bently Nevada products and fast shipping. For current lifecycle status and availability, please contact our team before ordering.