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DSE Model 8620 AMF Controller Operators Manual
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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.
FAILED TO SYNCHRONISE If the module cannot synchronise within the time allowed by the
Synchronising timer a warning is initiated. The LCD will indicate ‘FAILED
TO SYNC’ and the COMMON ALARM LED will illuminate
MAINS REVERSE POWER if the module detects a mains reverse power in excess of the pre-set trip
level and time delay, an electrical trip is initiated. The LCD will indicate
‘MAINS REVERSE POWER’ and the COMMON ALARM LED will flash.
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