Description

Bently Nevada’s Electronic Overspeed Detection System for the 3500 Series Machinery Detection System provides a highly reliable, fast response, redundant tachometer system intended specifically for use as part of an overspeed protection system. It is designed to meet the requirements of American Petroleum Institute Standards 670 and 612 pertaining to overspeed protection.

3500/53 modules can be combined to form a 2-out-of-2 or 2-out-of-3 (recommended) voting system.

The use of redundant power supplies in a 3500 rack containing the Overspeed Detection System is required.

Inputs

Signal:Each Overspeed Detection module accepts a single transducer signal from a proximity probe transducer or magnetic pickup. The input signal range is +10.0 V to -24.0 V. Signals exceeding this range are limited internally by the module.

Transducers:Bently Nevada 3300 8 mm Proximitor®; 3300 16 mm HTPS, 7200 5 mm, 8 mm, 11 mm, and 14 mm Proximitor®; 3300 RAM Proximitor®, or Magnetic pickups.

Alarm LEDs: Indicates that an alarm condition has occurred with the associated relay

Buffered Transducer Outputs: The front of each module has one coaxial connector for buffered output. Each connector is short circuit and ESD protected.

Recorder: +4 to +20 mA. Values are proportional to module full-scale range (rpm). Module operation is unaffected by short circuits on recorder output

Resolution: 0.3662 µA per bit ±0.25% error at room temperature ±0.7% error over temperature range. Update rate approximately 100 ms.

Speed Input: The 3500 Overspeed Protection Module will support from 1 to 255 events per revolution with a maximum full-scale range of 99,999 rpm and a maximum input frequency of 20 kHz. Minimum input frequency for proximity transducers is 0.0167 Hz (1 rpm for 1 event/revolution) and for passive magnetic pickups is 3.3 Hz.

RPM Accuracy: Less than 100 rpm = ± 0.1 rpm, 100 to 10,000 rpm = ±1 rpm, 10,000 to 99,999 rpm = ± 0.01%.

Auto Threshold: Use for any input above 0.0167 Hz (1 rpm for 1 event/revolution). Minimum signal amplitude for triggering is 1 volt peak-to-peak.

Manual Threshold: User selectable from +9.9 Vdc to -23.9 Vdc. Minimum signal amplitude for triggering is 500 millivolts peak-to-peak.

Alarm Setpoints: Under and Over Alert levels (setpoints) can be set for speed. In addition, a Danger (Overspeed) setpoint can be set for speed. All alarm setpoints are set using software configuration. Alarms are adjustable and can normally be set from 0 to 100% of full-scale of speed full-scale range.

General

If the 3500/53 is added to an existing 3500 System the following firmware and software versions (or later) are required:

3500/20 Module Firmware – Revision G

3500/01 Software – Version 2.00

3500/02 Software – Version 2.03

3500/03 Software – Version 1.13

The use of redundant power supplies in a 3500 rack containing the Overspeed Detection System is required.

133388-01 3500/53 Overspeed Detection Module

133396-01 Overspeed Detection I/O Module

04425545 Grounding Wrist Strap (single use)

04400037 IC Removal Tool

134129-01 Firmware IC

00580438 Connector Header, Internal Termination, 4-position, Green

00580436 Connector Header, Internal Termination, 6-position, Green

00580432 Connector Header, Internal Termination, 10-position, Green

134939-01 3500/53 Overspeed Detection Manua
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