Basler Electric DGC-2020 - Manual (Page 166)

Breaker Close Failure
Breaker Close failure pre-alarm settings consist of a single enable/disable setting X and a monitor setting Y .
If enabled, a Breaker Close Failure pre-alarm is annunciated if the DGC-2020 has issued a breaker close
output, and has not received feedback from the breaker status indicating it is closed before the breaker
close wait time has elapsed. The Monitor setting determines whether this condition is monitored only
during transitions or always.
Breaker Open Failure
Breaker Open failure pre-alarm settings consist of a single enable/disable setting Z and a monitor setting AA .
If enabled, a Breaker Open Failure pre-alarm is annunciated if the DGC-2020 has issued a breaker open
output, and has not received feedback from the breaker status indicating it is open before the breaker
close wait time has elapsed. The Monitor setting determines whether this condition is monitored only
during transitions or always.
Reverse Rotation
Reverse Rotation pre-alarm settings consist of an enable/disable setting BB . If enabled, a Reverse Rotation
pre-alarm is annunciated if the sensed generator or bus phase rotation differs from the phase rotation
specified in the System Parameters > System Settings screen.
Rated Data and Per Unit Values
Settings which are related to machine ratings can be set in either native units or in per unit values. When
a native unit is edited, BESTCOMSPlus automatically recalculates the per unit value based on the native
unit setting and the rated data parameter (on the System Parameters, Rated Data screen) associated
with it. When a per unit value is edited, BESTCOMSPlus automatically recalculates the native value
based on the per unit setting and the rated data parameter associated with it.
Once all per unit values are assigned, if the rated data parameters are changed, BESTCOMSPlus
automatically recalculates all native unit settings based on the modified rated data parameters.
The following settings have native units of Volts, and the rated data associated with them is Battery Volts
(on the System Parameters, Rated Data screen).
•
Low Battery Voltage
•
Weak Battery Voltage
•
Battery Overvoltage
Figure 4-48. Pre-Alarms
4-56 DGC-2020 BESTCOMSPlus
® Software
9400200990 Rev X