Table 4.8
Optional hardware
Function
I/O
Type
Details
Alarm system > Command > Reset all
latched alarms
Digital input Pulse
The controller resets all its latched alarms (that are ready to be
reset) when this input is activated.
4.5 Alarm test and status
4.5.1 Alarm test
The alarm tests activate controller alarms AND all their alarm actions. You can activate alarm tests from the
Alarms
page in PICUS,
or by enabling the
Enable alarm test
parameter, or by starting an alarm test for an individual alarm using the alarm's
Alarm test
parameter. When you use the
Enable alarm test
parameter to perform the alarm test, all the enabled alarms and their alarm actions
are activated, and shut down the engine.
DANGER!
DO NOT use the alarm test during normal operation. The alarm actions will force the system under switchboard control, trip
all the breakers, create a blackout.
More information
See
Alarms > Alarm parameters > Alarm test
for more information about testing individual alarms.
More information
See
Alarms > Tasks > Perform an alarm test
in the
PICUS manual
for more information about the alarm test buttons
available on the
Alarms
page in PICUS.
Before the test
Make sure that you are ready for a blackout. If a blackout is not acceptable, do not use the alarm test function.
Be aware that it may take you some time to get the system back to normal after an alarm test.
During the test
When the test is
Enabled
, the alarms appear on the display and in the alarm list, and are recorded in the log. Test alarms appear in
green text on the display, and are marked with a grey dot in the
T
column in the alarm list in PICUS.
If an alarm was acknowledged before the test, the alarm status changes to unacknowledged during the alarm test.
If an alarm is acknowledged during the test, the alarm remains on alarm list, and the alarm action continues until the alarm test
stops.
Latches
: Alarms with latches can be acknowledged and the latches reset manually during the test. If an alarm latch is reset during
the test, then the alarm is removed from the alarm list, and the alarm action stops.
Shelved alarms
: The alarm test unshelves these alarms, and they remain unshelved after the test.
Out of service alarms
: The alarm test returns these alarms to service. These alarms remain in service after the test.
After the test
When the test is
Not enabled
, the tested alarms remain active until they are acknowledged and, if required, their latches are
removed. The alarms are rechecked, and reactivated if the alarm conditions are still present. All the test alarms remain in the log,
and are indicated with a grey dot in the
T
column.
Alarms that were acknowledged before the alarm test, but the alarm condition remains active after the test are still acknowledged
when the alarm test stops.
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