Woodward easYgen-3000XT Series, Manual, Page: 490 / 1205

If one of these protective functions is triggered, the display indicates "Mains decoupling"
(the logical command variable "07.25" will be enabled) and the active level 2 alarm.
The mains decoupling function is optimized on the both relay outputs "GCB open" and
"MCB open". In case of using a free relay output in conjunction with the command
variable 07.25 an additional delay time of up to 20 ms is to consider.
Managing Breaker Open alarm
When the mains decoupling function detects a breaker open failure, the according
breaker alarm will be triggered as long the monitoring function is activated. Additionally
in cases where the decoupling mode has to change over to the other breaker,
(GCB®MCB, MCB®GCB), the alarm text “Decoupling GCB«MCB“ is indicated. The breaker
open alarm already occurs after the mains decoupling feedback delay (refer to ID
╚═▷
3113 ).
ID Parameter CL Setting range
[Default]
Description
12922 Ext. mns.decoupl.
(External mains
decoupling)
2 Determined by LogicsManager
86.27
[(0 & 1) & 1]
The unit may be configured to
decouple from the mains when
commanded by an external
device.
Once the conditions of the
LogicsManager have been fulfilled,
an external mains failure is issued.
Notes
For information on the
LogicsManager and its default
settings see
╚═▷ “9.3.1
LogicsManager Overview” .
12942 Enable mains
decoupl.
(Enable mains
decoupling)
2 Determined by LogicsManager
87.31
[(02.02 & 1) & 1]
Once the conditions of the
LogicsManager have been fulfilled,
the mains decoupling function is
enabled.
Notes
For information on the
LogicsManager and its default
settings see
╚═▷ “9.3.1
LogicsManager Overview” .
3110 Mains decoupling 2 Off Mains decoupling monitoring is
disabled.
[GCB] Mains decoupling is carried out
according to the following
parameters. If one of the
subordinate monitoring functions
is triggered, the GCB will be
opened. If the unit is operated in
parallel with the mains and the
MCB opens, the GCB will be closed
again.
GCB->MCB Mains decoupling is carried out
according to the following
parameters. If one of the
subordinate monitoring functions
is triggered, the GCB will be
opened. If the reply "GCB open" is
490 easYgen-3000XT Series B37574
4 Configuration
4.5.3.4 Mains Decoupling
Released