Winco DSE7300 Series - Manual (Page 100)

DSE7200 / 7300 Series Operators Manual
100
8.7 HIGH CURRENT SHUTDOWN / ELECTRICAL TRIP ALARM
The overcurrent alarm combines a simple warning trip level with a fully functioning IDMT curve for thermal
protection.
8.7.1 IMMEDIATE WARNING
If the Immediate Warning is enabled, the 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.
8.7.2 IDMT ALARM
If the IDMT Alarm is enabled, the 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 / ((IA / 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).