Protections
95
7.6 ELECTRICAL TRIPS
NOTE:- Shutdown and Electrical Trip alarms can be disabled by user configuration. See
the section entitled
Protections Disabled
elsewhere in this document.
Electrical trips are latching and stop the Generator but in a controlled manner. On initiation of the
electrical trip condition the module will de-energise the
‘Close Generator’
Output to remove the load
from the generator. Once this has occurred the module will start the Cooling timer and allow the
engine to cool off-load before shutting down the engine. The alarm must be accepted and cleared,
and the fault removed to reset the module.
Example
Alarm 1/1
Generator Current High
Electrical Trip
Electrical trips are latching alarms and stop the Generator. Remove the fault then press Stop/Reset
to reset the module.
Display
Reason
GENERATOR HIGH
CURRENT
If a generator output in excess of the high current alarm point, a warning
alarm occurs. If this high current condition continues for an excess
period, then the alarm escalates to either a shutdown or electrical trip
condition (depending upon module configuration). For further details of
the high current alarm, please see High Current Shutdown / Electrical
Trip Alarm.
AUXILIARY INPUTS
If an auxiliary input configured as an electrical trip is active, the user
configured message shows on the display.
kW OVERLOAD
The measured Total kW is above the setting of the kW overload
Electrical Trip alarm
EARTH FAULT
The measured Earth Current is above the setting of the Earth fault alarm.
NEGATIVE PHASE
SEQUENCE
Indicates ‘out of balance’ current loading of the generator.
Sometimes also called Negative Sequence Current or Symmetry Fault
FUEL USAGE
Indicates the amount of fuel used is in excess of the
Fuel Usage
alarm
settings. This often indicates a fuel leak or potential fuel theft.
LOADING VOLTAGE
NOT REACHED
Indicates that the generator voltage is not above the configured loading
voltage after the safety timer. The generator will shutdown.
LOADING FREQUENCY
NOT REACHED
Indicates that the generator frequency is not above the configured
loading frequency after the safety timer. The generator will shutdown.
PROTECTIONS
DISABLED
Shutdown and electrical trip alarms is disabled by user configuration. In
this case, Protections Disabled will appear on the module display; The
alarm text is displayed but the engine will continue to run. This is ‘logged’
by the module to allow DSE Technical Staff to check if the protections
have been disabled on the module at any time.
GENERATOR UNDER
FREQUENCY
The generator output frequency has fallen below the preset level
GENERATOR UNDER
VOLTAGE
The generator output voltage has fallen below the preset level
INSUFFICIENT
CAPACITY
If the module is configured for Mains CT and the load levels are so high
that the generator is unable to supply enough load to maintain the
configured mains level, insufficient capacity will be displayed and the
COMMON ALARM LED
will flash. The generator will provide 100% of its
capacity and the loading on the mains will increase.
UNDERSPEED
The engine speed has fallen below the underspeed setting
