◦ If the genset was not running before critical mode has been enabled, it will be
◦
stopped after cool down time (parameter
) has expired.
◦ The GCB will take the same state as it had before the critical mode has been
◦
enabled.
Critical mode during emergency power
An emergency power operation is active (load is supplied by the generator, GCB is closed,
MCB is open). If critical mode is enabled now, the GCB remains closed and the "Emerg/
Critical" message is displayed on the display screen. All shutdown alarms become
warning messages.
• Critical mode ends before mains recovery:
•
◦ The emergency power operation will be continued and all shutdown alarms
◦
become active again.
◦ If the mains return, the unit transfers the load from generator supply to mains
◦
supply after the mains settling delay expires, if Enable MCB (parameter
• Emergency power operation ends before the end of the critical mode:
•
◦ The critical mode is maintained and the load is transferred from generator
◦
supply to mains supply after the mains settling delay expires.
◦ The engine remains running until the conditions for the critical mode are no
◦
longer existent.
◦ If the genset was not running before critical mode has been enabled, it will be
◦
stopped after cool down time (parameter
) has expired.
◦ The GCB will take the same state as it had before the critical mode has been
◦
enabled.
Start request during critical mode
The critical mode operation has a higher priority than the remote request (Start/Stop
request in AUTO). Therefore, the remote request cannot start or stop the engine and has
no effect on the breaker positions. The "Critical mode" message is displayed on the
display screen and all shutdown alarms become warning alarms.
• Critical mode ends before the start request is terminated:
•
◦ The engine continues running. All shutdown alarms will become active again.
◦
◦ By resetting the start request the GCB will be opened and the engine will be
◦
stopped.
• Start request will be terminated before the critical mode is terminated:
•
◦ The critical mode operation is continued.
◦
◦ The engine keeps running until the conditions for the critical mode are no
◦
longer fulfilled and all shutdown alarms will become active again.
◦ If the genset was not running before critical mode has been enabled, it will be
◦
stopped after cool down time (parameter
) has expired.
389
easYgen-3000XT Series
B37574
4 Configuration
4.4.5.4.1 Critical Operation At Busbar
Released