9905-893

About the 9905-893

A few of the 9905-893 functions include:

• Built-in diagnostics
• Setup, metering, and diagnostic capability through a handheld programmer terminal  
• Automatic generator loading and unloading
• Droop, baseload, and isochronous load control capability
•  Reverse power relay.

This device has a WYE PT Configuration, a 500 Hz PWM Speed Bias, and a 120/240 Vac Input Voltage. It is rated for use in operating temps from –40 to +70 °C (-40 to 158 F) and storage temps from –55 to +105 °C (-67 to 221 F).

Additional environmental specifications for the 9905-374 are:

• Humidity …... 95% at 38 °C
• Mechanical shock …... US MIL-STD 810C, Method 516.2, Procedures I, II, V
• Electromagnetic susceptibility …... ANSI/IEEE C37.90.2; ANSI C37.90.1-1989
• Vibration …... US MIL-STD 167, Type I

Either phase matching or slip frequency synchronizing are available with the 9905-893. For both methods, actual slip frequency and breaker delay values are used to anticipate a minimum phase difference between generator and bus at actual breaker closure. There is an automatic dead-bus closure function on this control, where only one DSLC control is granted dead-bus closing permission through locking techniques over the communications network.

Additional synchronizer features that may be enabled or disabled during setup include time-delayed automatic multi-shot reclosing, voltage matching, auto-resynchronizing, and synchronizer timeout alarm

For additional information, product specifications, and safety precautions for Woodward part 9905-893 DSLC, please consult the Woodward DSLC Digital Synchronizer and Load Control Manual 02007.