Woodward easYgen-3000XT Series, Руководство пользователя

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Fig. 178: Critical operation at busbar
The GCB will not be closed if the load is supplied by the mains until the mains fail and the
MCB remains closed because emergency run (parameter
╚═▷ 2802 ) is disabled.
Critical mode during mains supply
If critical mode is enabled during mains supply (MCB is closed), the generator will be
started (if not already running) and the GCB will be closed.
• The "Critical mode" message is displayed on the display screen. All shutdown alarms •
become warning messages.
• If critical mode is disabled again, all shutdown alarms become active again. •
If the genset was not running before critical mode has been enabled, it will be stopped
after the critical mode postrun time (parameter
╚═▷ 4102 ) has expired. MCB operation
will be performed according to the configured transition mode.
Emergency power during critical mode
If there is a mains failure during critical mode, the "Emerg/Critical" message is displayed
on the display screen after the mains fail delay time (parameter
╚═▷ 2800 ) has expired.
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 returns, the unit transfers the load from generator supply to mains ◦
supply after the mains settling delay expires.
• 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.
◦ If open transition mode is configured, the GCB will not be opened to prevent a ◦
dead busbar.
◦ The engine remains running until the conditions for the critical mode are no ◦
longer existent.
388 easYgen-3000XT Series B37574
4 Configuration
4.4.5.4.1 Critical Operation At Busbar
Released