Technical Specifications

FAQ

1. What is the main function of the 60R/INP06 Key-Phasor Input Module?

The 60R/INP06 is a high-speed Key-Phasor input module designed for the Bently Nevada Orbit 60 machinery protection and condition monitoring system. Its primary purpose is to acquire rotational speed and phase reference signals from rotating machinery and process those signals with high timing accuracy. A Key-Phasor signal provides a precise reference point on a rotating shaft or gear, allowing the Orbit 60 system to determine rotational speed and establish the phase relationship between shaft rotation and vibration measurements. This information is particularly important for advanced machinery diagnostics, including rotor balancing, phase analysis, shaft vibration analysis, and identification of rotationally related faults. The module is especially useful for machines operating above 12,000 rpm, where the standard dynamic input modules may not provide the required phase accuracy.

2. How many speed inputs can the 60R/INP06 support?

The 60R/INP06 provides four input channels and can accept up to four speed inputs. Each channel can be configured as a once-per-turn Key-Phasor signal or as a multiple-event-per-turn speed signal generated from a rotating shaft or gear. This flexible configuration allows the module to support different machinery arrangements without requiring a separate module for every speed measurement. For example, one channel may be configured for the main shaft Key-Phasor signal while other channels can monitor additional shafts, gears, or speed references. The ability to configure each channel independently is particularly useful in complex turbomachinery systems where multiple rotating elements need to be synchronized. Before commissioning, each channel should be correctly assigned in the Orbit 60 configuration software and matched with the actual sensor and mechanical target used in the field.

3. What is the maximum speed supported by the 60R/INP06?

The 60R/INP06 supports input speeds up to 120,000 rpm and input speed signals up to 1,200,000 cpm, equivalent to 20 kHz. This high-speed capability is one of the main reasons for selecting the INP06 instead of using a conventional dynamic input module for high-speed machinery. Standard Orbit 60 dynamic input channels can be configured for Key-Phasor applications, but the dedicated high-speed Key-Phasor module is intended for applications where higher rotational speed and phase accuracy are required. When designing a system, engineers should consider not only the normal operating speed but also the maximum overspeed condition that may occur during startup, shutdown, testing, or abnormal operation. The sensor, target geometry, wiring, and input configuration must also be suitable for the expected rotational frequency.

4. Which sensors can be connected to the 60R/INP06?

The 60R/INP06 is designed to work with magnetic pickup sensors, 3-wire proximity sensors, and 3-wire accelerometers. These sensor types allow the module to be used for both rotational speed measurement and selected non-speed dynamic measurements. A magnetic pickup can be used to detect teeth or other ferromagnetic features on a rotating target, while a 3-wire proximity sensor can provide a precise reference from a shaft notch, keyway, or other suitable target feature. A 3-wire accelerometer can also be connected when the corresponding channel is configured for an applicable non-speed measurement. The sensor type must be selected according to the actual electrical requirements and mechanical application. Incorrect sensor selection, unsuitable target geometry, or improper wiring can result in unstable pulses, missing Key-Phasor events, incorrect speed readings, or phase errors.

5. What is the difference between a Key-Phasor signal and a normal speed signal?

A Key-Phasor signal provides more than simple rotational speed information because it establishes a repeatable angular reference for the rotating shaft. A once-per-turn Key-Phasor signal can identify a specific point on the shaft during every revolution, allowing vibration measurements to be synchronized with shaft position. This phase reference is essential when performing 1X amplitude and phase analysis, rotor balancing, orbit analysis, and other diagnostic functions. A multiple-event-per-turn signal can provide additional timing information when a shaft or gear contains several repeating features. The 60R/INP06 can be configured for either once-per-turn or multiple-event-per-turn operation. Correct mechanical target design and sensor positioning are therefore important because the quality of the Key-Phasor signal directly affects the accuracy of phase-related diagnostic measurements.

6. Can the 60R/INP06 be used for measurements other than speed?

Yes. Although the 60R/INP06 is primarily designed as a high-speed Key-Phasor input module, its channels can also be configured for certain non-speed measurements, including acceleration, differential expansion, radial vibration, and thrust-related inputs. However, the accuracy of these non-speed measurements is lower than that provided by the dedicated PAV, PAS, PAA, PAD, and PVT input modules. For applicable 3-wire non-speed connections from 0 to 40 kHz, the accuracy changes from approximately 1% of Full Scale Range on the dedicated input modules to approximately 2% of Full Scale Range on the Key-Phasor module. In addition, non-speed inputs cannot be used for SIL applications. Therefore, when the primary requirement is high-quality vibration or other dynamic measurement rather than high-speed phase reference, the appropriate dedicated dynamic input module should normally be selected.

7. Can the 60R/INP06 be used in a SIL application?

Yes, but there is an important configuration limitation. The 60R/INP06 can be used in SIL applications when its channels are configured for speed inputs. Non-speed input configurations on the Key-Phasor module cannot be used for SIL applications. The ordering configuration also determines whether the module is supplied with the required SIL capability, with available options including No SIL and SIL 2 configurations. When designing a safety-related machinery protection system, engineers must verify the complete ordering code, system architecture, sensor arrangement, and applicable safety requirements rather than assuming that every INP06 module automatically provides SIL functionality. The selected module configuration must be consistent with the safety integrity requirements of the complete Orbit 60 system. Proper configuration and validation are particularly important for overspeed protection and other safety-critical rotating machinery applications.

8. How should a 60R/INP06 Key-Phasor signal fault be troubleshot?

When the 60R/INP06 does not receive a stable Key-Phasor signal, troubleshooting should begin with the field sensor and mechanical target. First check whether the magnetic pickup, proximity sensor, or accelerometer is correctly installed and positioned. For a proximity-based Key-Phasor system, the target notch, protrusion, keyway, or other reference feature must provide a clean and repeatable sensor response. Next inspect the sensor wiring, power supply, shielding, connectors, and signal polarity. The module’s OK LED and LINK LED should also be checked to confirm that the module itself is operating and communicating with the Orbit 60 system. The corresponding channel status indication can provide additional information about the sensor condition. After the physical inspection, review the configured speed channel, expected pulse frequency, number of events per revolution, and rotational speed settings in the system software. If the signal is present but the measured phase or speed is incorrect, verify the mechanical target configuration and channel scaling. This systematic approach helps distinguish sensor faults, wiring problems, configuration errors, and mechanical target issues from an actual module failure.