DEEP SEA ELECTRONICS DSE8620 - High Current Shutdown; Electrical Trip Alarm; Immediate Warning; Idmt Alarm

DSE Model 8620 AMF Controller Operators Manual
94
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
7.7 HIGH CURRENT SHUTDOWN / ELECTRICAL TRIP ALARM
The overcurrent alarm combines a simple warning trip level with a fully functioning IDMT curve for
thermal protection.
7.7.1 IMMEDIATE WARNING
If the Immediate Warning is enabled, the DSE8600 Series controller generates a warning alarm as
soon as the Trip level is reached. The alarm automatically resets once the generator loading current
falls below the Trip level (unless All Warnings are latched is enabled). For further advice, consult your
generator supplier.
7.7.2 IDMT ALARM
If the IDMT Alarm is enabled, the DSE8600 Series controller begins following the IDMT ‘curve’ when
the trip level is passed.
If the Trip is surpassed for an excess amount of time the IDMT Alarm triggers (Shutdown or Electric
trip as selected in Action).
High current shutdown is a latching alarm and stops the Generator.
Remove the fault then press Stop/Reset to reset the module.
High current electrical trip is a latching alarm and removes the generator from the load, before
stopping the Generator after the off load cooling timer.
Remove the fault then press Stop/Reset to reset the module.
The higher the overload, the faster the trip. The speed of the trip is dependent upon the fixed formula:
T = t / ( ( I
A
/ I
T
) – 1 )
2
Where: T is the tripping time in seconds
I
A
is the actual current of the most highly loaded line (L1 or L2 or L3)
I
T
is the delayed over-current trip point
t is the time multiplier setting and also represents the tripping time in seconds at twice full load (when I
A
/ I
T
= 2).