9287500991 Rev K DECS-100 Functional Description 3-7
The DECS-100 voltage matching option automatically matches the rms generator output with the rms bus
voltage prior to synchronizing. The DECS-100 compares and matches the generator voltage with the bus
voltage by adjusting the dc excitation current. Voltage matching is enabled when the bus voltage is within
10% of the nominal sensing range selected. As long as the values of generator and bus voltage (applies
to the DECS-100 voltage sensing inputs) are within the acceptable range, voltage matching can be
achieved.
The rate at which the DECS-100 matches the generator input level with the bus input level is controlled
by a voltage matching speed setting. this setting is adjustable from 1 to 300 seconds in 0.01 second
increments.
Voltage matching can be disabled by the state of the DECS-100 contact inputs. In BESTCOMS, the
52J/K contact input, 52L/M contact input, or both contact inputs can be configured to enable and disable
voltage matching. To enable bus voltage matching, select 52J/K. This will allow droop to remain active.
When the utility tie breaker closes, voltage matching will be disabled automatically (via the 52J/K contact
input) and var/power factor control will be enabled.
Two voltage matching modes are available: Maintain and Revert. When Maintain mode is implemented,
the DECS-100 setpoint is maintained at the bus voltage level even when the generator or utility breaker is
open. When Revert mode is implemented, the DECS-100 setpoint reverts to its original level when the
generator or utility breaker opens. Revert is the default voltage matching mode.
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