• No class C alarm or higher is present.
•
• The engine is running.
•
• The engine delayed monitoring (parameter
) as well as the generator
•
) have been expired.
• The generator voltage and frequency are within the configured operating range (
•
“4.5.1.1 Generator Operating Ranges: Voltage / Frequency / Busbar”
).
• The button "Close GCB" has been pressed.
•
• The MCB has been open for at least the time configured in "Transfer time GCB↔MCB"
•
(Mode
A04
with open transition mode only)
• The busbar voltage is below the dead bus detection limit (parameter
).
•
• There is no other GCB closed in the same segment.
•
• There is no other device with a smaller device ID willing to close its GCB too (Dead
•
busbar closure negotiation).
Dead Busbar Negotiation
Each easYgen, who intends to close its GCB on a dead busbar publishes a “Dead busbar
closure request” flag over CANbus and reads back whether there is any other easYgen
publishing the same intension:
If not, the unit waits an estimated time for security and then closes its breaker.
If yes, the unit compares its own device number with the smallest device number of all
others who also intend to close. If the own device number is smaller than the rest, the
unit will close its breaker - otherwise it blocks its own closure.
The easYgen removes its wish to close its GCB on a dead busbar, if the GCB closure
failure occurs in a multiple generator application. So the next easYgen with the higher
device number gets the permission for closure.
The load sharing messages are monitored. In case of a “missing member” alarm on the
load share bus, the single dead bus closures are delayed depending on the own
Generator number to avoid simultaneous closure. The delay time is Generator Number
multiplied with 500 ms.
The GCB dead busbar closure is realized faster, if LogicsManager "Undelayed close GCB"
ID 12210 is set to TRUE.
The dead busbar negotiation is done over all segments by default (Parameter
is
set to On).
If Parameter
is set to Off the dead busbar negotiation is done only for the own
segment.
265
easYgen-3000XT Series
B37574
4 Configuration
4.4.3.1.1 Dead Bus Closing GCB
Released