EGCP-2 Engine Generator Control Package Manual 26086
90 Woodward
Also, for a transfer of master to occur, the units have to be in an auto sequencing
mode of operation. This implies either a load sharing, or process mode of load
control. Without being in these operating modes, a transfer of master cannot
occur because the New Master cannot sequence the Previous master off line.
The load control modes which does not support new master transition is the
Base Load mode. In Base Load Mode, there is no sequencing between units,
and therefore a change of master cannot take place until the units are either
taken out of base load mode, or switched to an isochronous load sharing, or
process control mode.
NOTE
Master Controls operating in the Process Control Mode must have a 4–20
mA or 1–5 Vdc transducer input to function properly.
Changing the Priority of a Slave Unit—No Slaves On Load
MAINS
NETWORK ADDRESS #2
NETWORK PRIORITY #2
NO MAINS FAILURE DETECTED
ADDRESS: 1 2 3
OPER.
PRIORITY 1 2 3
MASTER 1
NEXT ON ALL
NEXT OFF
MASTER SEQUENCING SCREEN
SYSTEM LOAD = 0%
ALL GENERATORS OFF LOAD
G G
NETWORK ADDRESS #1
NETWORK PRIORITY #1
G
NETWORK ADDRESS #3
NETWORK PRIORITY #3
VIS-119
00-04-27
Figure 4-14. Changing the Priority of a Slave Unit
If a slave unit’s priority is changed in such a way as to simply shift that slave’s
place in the sequencing scheme without making the slave a New Master, then
one of two things will happen depending on that slaves place in the priority order.
1. The slave will simply take its place in the new sequencing order without
having to go on load.
2. The slave will have to go on load in order to properly assume its new priority
setting in sequencing system.
Case 1 will occur if the slave’s priority is changed either when there are no units
running, and no Loss of Mains detection has occurred, or if the slave itself is not
running due to system load levels not requiring the unit to be on line, and the
priority of the slave is decreased (taken to a higher numerical value).
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