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User’s Manual
Starting from 08.00.24 version, it is possible to avoid black-out due to KR failure. In case of
such failure the user power line remains unsupplied if the grid is present. Using this function
is possible to guarantee power availability at user level.
To use this function the system must be configured as following:
Connect to “INPUT C” (terminal 12) a signal from KR that will be close to GROUND when
KR is close.
Enable KR status monitoring at level board setting to 1 bit 1 of P61.
Enable F13 alarm (warning) setting a value greater than 0 for P75.
Enable the automatic recovery function setting to 1 bit 5 of P61.
Set AUTO or TEST mode.
Working with this configuration, if the board doesn’t acknowledge KR closed, after P75 time,
issues a “F13” alarm.
If bit 5 of P61 is set, the board interrupts cooling down sequence or, if engine is not running,
starts the engine and make the Generator set supplying users.
At this point the board doesn’t connect the load to the mains (even if it’s acknowledged) until
operator performs an appropriate action:
Up to software release 08.00.24, this operation consists in pressing the key
“MODE/ACK” one time.
Up to software release 08.00.25 this operation consists in pressing the key
“MODE/ACK” twice (the first pressure to switch off the horrn).
From software release 08.00.26 this operation consists in setting the MAN mode,
manually make the mains supplying users and then set the AUTO mode again.
After these operations, if the board doesn’t acknowledge KR closed, the alarm “F13” is issued
again and the procedure is repeated.
Starting from SW release 08.00.35, the function has been modified in order to inhibit the engine
start (caused by this alarm) if the input “MAINS SIMULATION” (terminal 24) is active and if the
board is configured to use the internal mains sensor. If this case, in fact, the “MAINS
SIMULATION” is used as “inhibition for automatic intervention“: thus, even this automatic
intervention have to be inhibited. If the board doesn’t measures the mains, this input is used
as an external mains sensor and so it cannot inhibit this automatic intervention (because it is
in case of mains presence that the alarm F13 causes the engine to start).
Starting from revision 08.00.38, this block may be masked if mains is not present, by using bit
1 of parameter P79. This mask is useful in plants where the mains breaker is powered by the
mains itself. In this situation, when the mains become unavailable, the board immediately
acquires the breaker open status. The board needs a lot of seconds in order to start the engine
and to close the load on the genset, and so the condition of breaker open while the command
is for closure remains for a lot of time. This condition causes the alarm “F13” to be raised. But
if the alarm is masked when mains is not present, this false alarm is not raised.
Please see par. 7.7.4
