9905-995 - Energize-to-Trip Unit

SPECIFICATIONS

Part Number: 9905-995
Manufacturer: Woodward
Product type: Energize-to-Trip Unit
Size: 482.6 x 310.4 x 142.7 mm
Operating Temperature: –15 to +60 °C
NEMA Rating: 4 and IP54
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

9905-995 is a Energize-to-Trip Unit developed by Woodward. It is a part of Woodward ProTech 203 Series. This module plays a pivotal role by displaying real-time speed data from individual speed probes, highlighting the highest speed signal, and facilitating online testing. Its modular design enhances adaptability, offering CPU and MPU failure indications for heightened operational reliability. The component conforms to standards by ensuring proper ventilation for cooling and allocating ample space for convenient servicing, thereby promoting optimal performance and ease of maintenance.

Features

• The Woodward ProTech model mentioned here serves to activate a trip relay when it detects overspeed conditions through a two-out-of-three hardware voting mechanism. In cases where only one of the three speed-sensing units identifies the overspeed condition, that specific unit will trigger a trip, while the rest of the system remains operational. Notably, the Model is one of the energized-to-trip variants within the ProTech overspeed protection series, implying that during normal operations, the voter relays are in a de-energized state.
• To ensure optimal performance, the installation of the module demands proper consideration. It necessitates placement in a location that guarantees adequate ventilation for cooling and maintains an operating temperature range spanning from -25 to +60 °C. Sensitivity to vibration and electromagnetic interference underscores the importance of safeguarding the device from high-current or high-voltage equipment. Detailed guidelines concerning the ideal installation conditions for the Model are comprehensively outlined in the Woodward ProTech manual 85196.
• Three identical speed-sensing units equipped with magnetic pickups (MPUs) meticulously monitor the speed of the prime mover. Each unit boasts an independent 24 Vdc power supply and an operator interface complete with LCD, keypad, LED indicators, and a potentiometer. This interface serves as the hub for activities ranging from programming to troubleshooting.
• During standard operation, the LCD provides insights into the status of each unit for effective monitoring. In the event of an error or a unit trip, the displays an error code. Events such as MPU or CPU failures trigger corresponding LED indicator lights. Moreover, a tripped unit triggers both an LED indicator and an alarm output, ensuring prompt and clear notifications in critical scenarios.

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Frequently Asked Questions

What is 9905-995?
It is an MicroNet Energize-to-Trip Unit developed by Woodward.

How does the component display speed data from speed probes?
The component showcases the actual speed data obtained from separate speed probes, providing accurate insights into the system's operational status.

What is the benefit of the highest speed signal display?
The component not only displays individual speeds but also identifies and highlights the highest speed signal among them, aiding operators in identifying critical operational conditions.

What is the significance of the online testing feature with a modular design?
The online testing feature allows diagnostic assessments while the system is operational, minimizing downtime. The modular design enhances adaptability, facilitating future upgrades or replacements.