Basler DECS-250, Instruction Manual

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20 9440300990 Rev J
Synchronizer DECS-250
bus, the DECS-250 uses the breaker closing time
D
to calculate the optimum time to close the breaker. For
a pulse-controlled generator breaker, the breaker open
E
and close
F
pulse times are used by the DECS-
250 when issuing open and close commands to the breaker. When setting the pulse times, the open and
close times should be set at or longer than the breaker closing time setting.
If desired, breaker closure is possible during a dead bus condition
G
and/or dead generator condition
H
.
Caution
Use caution when connecting a “dead” generator to a “dead” bus.
Undesired system damage can occur if the bus becomes energized
while a “dead” generator is connected to it.
Figure 12. Breaker Hardware Configuration Settings
A
Breaker Close Wait Time : Adjustable from 0.1 to 600 s in 0.1 s increments.
B
Gen Breaker : Select Configured or NOT Configured.
C
Contact Type : Select Pulse or Continuous.
D
Breaker Closing Time : Adjustable from 0 to 800 ms in 5 ms increments.
E
Open Pulse Time : Adjustable from 0.01 to 5 s in 0.01 s increments. Setting is available only when
Contact Type is Pulse.
F
Close Pulse Time : Adjustable from 0.01 to 5 s in 0.01 s increments. Setting is available only when
Contact Type is Pulse.
G
Dead Bus Close : Select Disabled or Enabled.
H
Dead Gen Close Enable : Select Disabled or Enabled.
Generator and Bus Condition Detection
BESTCOMSPlus Navigation Path: Settings Explorer, Synchronizer/Voltage Matching, Bus Condition
Detection
HMI Navigation Path: Settings, Sync/Voltage Matching, Bus Condition Detection
The DECS-250 monitors the voltage and frequency of the generator and bus for determining when a
breaker closure is appropriate. Generator and bus condition detection settings are illustrated in Figure 13.
Generator Condition
A dead generator is recognized by the DECS-250 when the generator voltage decreases below the dead
generator threshold
A
for the duration of the dead generator activation delay
B
.