Basler Electric DECS-250N - Manual (Page 39)

9440500990 Rev D 23
DECS-250N Synchronizer
I Dead Bus Threshold: Adjustable from 0 to 600,000 Vac in 1 Vac increments.
J Dead Bus Activation Delay: Adjustable from 0.1 to 600 s in 0.1 s increments.
K Bus Failed Activation Delay: Adjustable from 0.1 to 600 s in 0.1 s increments.
L Bus Stability Overvoltage Pickup and Dropout: Adjustable from 10 to 600,000 Vac in 1 Vac increments.
M Bus Stability Undervoltage Pickup and Dropout: Adjustable from 10 to 600,000 Vac in 1 Vac increments.
N Bus Stability Overfrequency Pickup and Dropout: Adjustable from 46 to 64 Hz in 0.05 Hz increments.
O Bus Stability Underfrequency Pickup and Dropout: Adjustable from 46 to 64 Hz in 0.05 Hz increments.
P Bus Stable Activation Delay: Adjustable from 0.1 to 600 s in 0.1 s increments.
Generator Governor Control
BESTCOMSPlus Navigation Path: Settings Explorer, Synchronizer/Voltage Matching, Governor Bias
Control Settings
HMI Navigation Path: Settings, Sync/Voltage Matching, Governor Bias Control Settings
During synchronization, the DECS-250N adjusts the generator voltage and frequency by issuing speed
correction signals to the speed governor. Correction signals are issued in the form of DECS-250N output
contact closures. These correction signals may be either continuous or proportional
A . When proportional
correction is selected, the correction pulses are of varying widths B and intervals C . Initially, long pulses are
issued when the frequency difference between the generator and bus is large. As the correction pulses
take effect and the frequency difference becomes smaller, the correction pulse widths are proportionally
decreased.
Governor bias control settings are illustrated in Figure 14.
Figure 14. Generator Governor Control Settings
A Bias Control Contact Type: Select Continuous Pulse or Proportional Pulse.
B Correction Pulse Width: Adjustable from 0 to 99.9 s in 0.1 s increments.
C Correction Pulse Interval: Adjustable from 0 to 99.9 s in 0.1 s increments.