Protections
96
8.6 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. This feature is available from V4
onwards.
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
MSC OLD UNITS ON BUS
If the module detects a module on the MSC link which is incompatible with
the current module, then the MSC Compatibility alarm will be triggered.
Check all the modules’ version numbers (under About | Application Number
on the modules’ displays), modules pre V3 cannot communicate with
modules V4 and onwards. Use the DSE Configuration Suite Software to
upgrade the firmware (Tools | Update Firmware) of the older modules to V4
and onwards.V5.0 cannot communicate with older modules and V5.1 saw a
change where Dse 55xx and 75xx series communicate with 86xx range of
modules, therefore all 86xx need to be at V5.0+ to communicate on the
same MSC link.
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