Model: WOODWARD 9907-149
Dimensions: Width 19 inches x height 12.244 inches x depth 5.62 incheshttps://www.gsplcdcs.com/
Feature: Hot replacement
Input voltage: 120 V AC/DC
Keyboard/Monitor: 1 monitor and keyboard per module
Operating temperature: -13 to +140 °F
Standard: NEMA 4/4x, IP54
Weight: Less than 17 pounds

Product description
The ProTech model 9907-149 is a 120 Vac/dc device. Each of the three speed sensing units in the system has a separate power supply. This is part of the modular design of Woodward’s overspeed protection device, which enables functions such as hot replacement of individual units and testing of individual units without taking the prime mover offline.

The speed sensing units A, B, and C in Model 9907-149 are identical. In addition to having a separate power supply, these devices also have a separate operating interface and alarm system. These three cells are configured with a two-thirds voting method. Prior to the hardware voting, the three units operated independently, monitoring the prime mover speed via a magnetic pickup (MPU) and performing speed calculations separately.

The three units that make up ProTech Model 9907-149 must be programmed using the same trip points. PROGRAM mode is accessed via key switches connected to all three units. Because of the modular design of the Woodward system, the units are individually programmed.

When the device is in PROGRAM mode, tunable parameters are set. These parameters include:

Travel speed set points (250 rpm to 25,000 rpm)
MPU gear teeth (20 to 120)
MPU failure timeout (1 second to 533 minutes 20 seconds)
MPU failure set points (100 rpm to 25,000 rpm)
The MPU fails to trip
The timer starts when it is reset