Woodward 9907 - 147 is a de - energize - to - trip overspeed protection system that belongs to the ProTech 203 series, and it is specially designed for overspeed protection of prime movers. Its place of origin is the United States, and it is equipped with a one - year warranty in most supply channels.

In terms of electrical performance, this product adopts a 24 VDC input voltage. It relies on magnetic pickups to monitor the speed of the prime mover, with a speed - sensing frequency range of 100 Hz to 32 kHz and a trip - point frequency range of 250 Hz to 25 kHz. Each speed - sensing unit can be programmed with independent trip set points, but these set points must be set identically to ensure accurate output of the system. The speed measurement accuracy of the system reaches ± (0.05% × trip point frequency value in Hz + 2 Hz), which can guarantee the accuracy of overspeed judgment.

In terms of core protection configuration, the product is equipped with three independent speed - sensing units. Each unit independently monitors the speed and performs speed calculation. The system adopts a two - out - of - three voting structure. Only when at least two units detect an overspeed situation at the same time, the prime mover trip relay will be activated to trigger a safe shutdown, which effectively avoids misoperation caused by the failure of a single unit and improves the reliability of the protection function. In addition, the system also has CPU and MPU failure detection and indication functions, which can promptly remind users of equipment faults.

In terms of human - computer interaction and safety design, the product is equipped with three LCD displays, each of which is a 2 - line 16 - character screen. Each speed - sensing unit is matched with a dedicated operation interface, and each interface is equipped with a touchpad, a potentiometer, LED indicators and an alarm output interface, facilitating users to view speed data, adjust parameters and grasp the alarm status of the equipment. It is also configured with a lockable shell and a key switch. The key switch is connected to all three speed - sensing units, which can realize the switching between monitoring mode and programming mode. The programming and testing functions of the system are locked to prevent unauthorized personnel from modifying parameters at will and ensure the stability of the system operation.

In terms of physical and environmental parameters, the product weighs less than 17 pounds (about 7.71 kg), and some supply channels mark its weight as 5.44 kg. Its overall dimensions are 482.6 mm in width, 310.4 mm in height and 142.7 mm in depth. The operating temperature range of the system is -25℃ to +60℃, while the temperature range suitable for the display to work is -15℃ to +60℃.

Regarding installation requirements, the product is vulnerable to electromagnetic interference, vibration and moisture. Therefore, it should be installed in a well - ventilated location. This not only helps the equipment dissipate heat but also reserves sufficient space for later maintenance. At the same time, it needs to be kept away from direct sunlight as well as high - current and high - voltage equipment to prevent these environmental factors from affecting its detection accuracy and service life.

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