Parameter Range Default Notes
The system is limited to a maximum of 12 controllers. If you have 12 GENSET
controllers, and you set this parameter to 12 or higher, all the gensets in AUTO mode are
always connected.
7.5 Blackout
7.5.1 Blackout and blackout recovery conditions
Blackout recovery is the power management system's attempt to recover from a blackout by connecting to another power source, or
starting one or more gensets automatically, when a dead busbar is detected.
INFO
When there is at least one controller under PMS control, the blackout recovery sequence always responds to a blackout
and cannot be disabled.
Blackout conditions
A blackout is present if the following conditions are all met, at all controllers in the section*:
• The phase-to-phase voltage is less than 10 % of the nominal voltage (V
L-L
< 10 % of V
nom
).
◦ This percentage is fixed.
◦ If one or more controllers in the section do not detect a blackout, the controller(s) that detected the blackout activate the
Blackout detection mismatch alarm.
• The generator breakers are open.
◦ That is, there are no gensets, shaft generator or shore connections connected.
• The blackout detection delay timer has run out (Configure > Parameters > Busbar > AC setup > Blackout detection >
Blackout delay).
*If a controller cannot communicate with the other controllers in the section, then that controller is forced to switchboard control (and
does not start blackout the blackout recovery sequence).
If one or more of the blackout conditions disappear, there is no longer a blackout.
Conditions that prevent blackout recovery
If any of the following conditions are present in the section, the power management system will not start the blackout recovery
sequence:
• A digital input is configured with the Power management > Block blackout start function, and activated.
• A breaker position is unknown.
• There is a short circuit.
◦ A digital input with the function Breakers > [Breaker] > Feedback > [*B] short circuit was activated.
◦ The parameter Power management rules # > Blackout > Short circuit close attempts, where # is 1 to 8, can allow at
most one short circuit in the section. The controller that detected the short circuit cannot close its breaker. However, one
other controller in the section can try once to close its breaker during blackout recovery.
• There is a blocking alarm.
◦ The alarm action determines whether the alarm is a blocking alarm.
• All of the controllers that could be part of the blackout recovery are under switchboard control.
More information
See System principles, Control and modes, Switchboard control for information on events that force controllers under
switchboard control.
DESIGNER'S HANDBOOK 4189340911K UK Page 242 of 521
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