9905-354

About the 9905-354

Woodward model 9905-354 is a microprocessor-based DSLC Digital Synchronizer and Load Control. This control is designed for paralleling, synchronizing, loading, and unloading three-phase generator sets when used with a Woodward speed control and an automatic voltage regulator.

A few of the 9905-354 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.

The 9905-354 offers either phase matching or slip frequency synchronizing. Actual slip frequency and breaker delay values are used to anticipate a minimum phase difference between generator and bus at actual breaker closure for both methods. 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
• Synchronizer timeout alarm

With the 9905-354 DSLC control, the internal digital base load reference may be raised or lowered through switch inputs. Possible remote load setting via a 4–20 mA analog input. Load and unload ramps ensure a smooth transition when the operating mode is changed.

To protect against static damage, certain precautions should be followed when working with or near the control, such as touching and holding a grounded metal object (pipes, cabinets, equipment, etc.) to discharge the static electricity on your body to the ground before doing maintenance on the DSLC, wearing natural fiber clothing while performing maintenance on the control, and keeping plastic, vinyl, and Styrofoam materials away from the control, the modules, and the work area as much as possible.