Basler DGC-2020ES Configuration Instruction Manual page 87

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Bus Condition Detection
(These thresholds determine when the generator and bus are considered to be stable or dead.)
Set the parameters for detecting stable and failed bus and generator under the BESTCOMSPlus Settings
Explorer, Breaker Management, Bus Condition Detection. If using the front panel, navigate to Settings >
Breaker Management > Bus Condition Detection.
Figure 10-3 illustrates the BESTCOMSPlus Bus Condition Detection screen.
1. Generator Sensing
a. Dead Bus Voltage Threshold and Activation Delay. When the generator voltage is below
this threshold for the duration of the activation delay, the generator is deemed "Dead".
b. Gen Stable Overvoltage and Undervoltage thresholds and Overfrequency and
Underfrequency thresholds and the Bus Stable and Bus Failed Activation Delay times.
When the generator voltage frequency is within the specified range for the duration of the
Bus Stable Activation Delay, the generator is deemed "Stable". Otherwise, it is deemed
"Failed".
2. Bus Sensing
a. Dead Bus Voltage Threshold and Activation Delay. When the voltage of the bus is below
this threshold for the duration of the activation delay, the bus is deemed "Dead".
b. Bus Stable Overvoltage and Undervoltage thresholds and Overfrequency and
Underfrequency thresholds and the Bus Stable and Bus Failed Activation Delay times.
When the bus voltage and frequencies are within the specified ranges for the duration of
the Bus Stable Activation Delay, the bus is deemed "Stable". Otherwise, it is deemed
"Failed".
The bus condition parameters are critical because they determine
when a breaker can be closed. The generator breaker can be closed
when any one of the following is true:
• The generator is stable, the bus is dead, and both breakers are
open.
• The generator is dead, the bus is dead, and both breakers are
open.
The mains breaker can be closed only when the bus is stable and both
breakers are open.
Place the unit in AUTO. The unit is now configured for generator breaker control. It can be tested by
driving the RUN WITH LOAD logic element true, setting up the exercise timer for a loaded test, or by
starting the unit in RUN or AUTO mode and giving it CLOSE and OPEN commands from the physical
inputs if they are available for breaker control.
Refer to the Troubleshooting chapter if the breaker does not seem to operate properly.
DGC-2020ES
Caution
10-5
Breaker Management