9906-619 is Woodward 723PLUS Digital Control hardware. This part is only the hardware; it does not contain any software. Model 9906-619 is one of three available models of this type. This hardware is a low-voltage model. The two alternate parts, 9906-620, the high-voltage alternate to the 9906-619 model, and the 9906-700 model, which is a low-voltage model with actuator filtering, are the only two other available models under the Digital Control Hardware section of models.
This 723PLUS control is in a sheet metal chassis with three 9-pin subminiature D connectors and three terminal strips for connections. The 9906-619 has an external power supply rated for 18–40 Vdc (24 or 32 Vdc nominal).
This hardware is compatible with magnetic pickups (MPUs) or proximity switches, depending on the need of the application. The 9906-619 can be used in load-sharing or droop parallel generator applications, among others, because of its compatibility with optional accessories. Some accessories that can be used with the 9906-619 include the Woodward Hand Held Programmer, a Digital Synchronizer and Load Control (DSLC), LinkNet nodes, an SPM-A Synchronizer, and more. Woodward 723PLUS Hardware Manual 02877 has a complete list of all the 723PLUS Digital Control accessories.
When initially operating the 9906-619 model, it must be tuned to the plus system, installation, and component tolerances to ensure that the model is functional at optimal performance. When adjusting the system modifications through set points, if requiring the rate of change to be altered faster, it is best to use the RABBIT UP and RABBIT DOWN keys rather than the TURTLE UP and TURTLE DOWN keys. To save the new set points to the EEPROM memory function, use the SAVE key; the EEPROM memory ensures that all set points are retained when the control is shut down or has power removed.