INFO
A stand-alone EMERGENCY genset controller does NOT regard itself as the last power source. In AUTO mode, the
controller can therefore open the generator breaker and stop the engine when there is power on the main busbar.
SEMI mode
You can connect stand-alone emergency genset to the main busbar in SEMI mode if Tie breaker sync. enabled is Enabled. Start the
genset, then close the genset breaker. Be aware that if the EDG max. parallel time alarm is Enabled, the controller will trip the tie
breaker after the Delay.
To open the generator breaker for a connected stand-alone emergency genset, the following conditions are met:
• The EMERGENCY genset controller AC measurements must show that there is power on the main busbar
• If the controller has a Main busbar is OK digital input, it must be activated
If the conditions are met, you can use the generator breaker open push-button on the display unit to open the generator breaker.
Blackout response
More information
See EMERGENCY genset controller, Other EMERGENCY genset controller functions, Blackout response
(emergency busbar blackout) for information on how the stand-alone EMERGENCY genset controller responds to a
blackout.
Harbour operation
Harbour operation is not possible for a stand-alone emergency genset.
9.7.4 Main busbar is OK
You can configure a Main busbar is OK digital input as an extra check. After a blackout, when power is restored, the input allows the
controller to disconnect and stop the emergency genset. The input also allows the tie breaker to connect to the main busbar.
Input
Assign the input under Configure > Input/output. Select the hardware module, then select the input to configure.
Function
I/O Type Details
Power management > Main
busbar is OK
Digital input Continuous
If this digital input function is configured, then this digital input must
be activated for the controller to close the tie breaker.
9.8 Other EMERGENCY genset controller functions
9.8.1 Blackout response (emergency busbar blackout)
The emergency genset blackout response starts after all the blackout conditions have been met:
• The voltage on the main busbar is below a set level (that is, a black busbar).
• The emergency generator breaker is OPEN.
When a blackout is detected on the busbar, the EMERGENCY genset controller starts the Blackout delay timer (see below) to give
other gensets a chance to resolve the blackout. When the timer expires, the controller responds according to the Blackout control
parameter (see below).
If the EMERGENCY genset controller is running a Test when the blackout occurs, the controller automatically stops the test, goes
into the mode specified for after the test, and starts the blackout response.
When power is restored to the main busbar, the controller may stop the emergency genset, depending on the emergency genset
configuration and the EMERGENCY genset controller mode.
DESIGNER'S HANDBOOK 4189340911K UK Page 339 of 521
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