KUC720AE KUC720AE01 ABB Excitation control module inventory is affordable

KUC720AE KUC720AE01 ABB Excitation control module inventory is affordable

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Stage U

generated for alarm purposes, the Start/Alarm indicator LED is lit and the fault is

indicated as an alarm instead of a trip.

When stage U

* Start signal of stage is not generated

* Trip signal of stage is generated, but it is indicated as an alarm

* Stage cannot be used for triggering CBFP

* Number of starts is increased instead of number of trips

When the conventional protection mode is selected and the voltages fall below the

set start value of the high-set stage, U<<, the stage generates a start signal after a ~

50 ms’ start time. When the set operate time at definite-time characteristic or the

calculated operate time at IDMT characteristic elapses, the stage generates a trip

signal. The stage is reset in 70 ms after the phase-to-phase voltages have exceeded

the set start value of the stage.

The undervoltage stages have a settable drop-off/pick-up ratio, which is adjustable

between 1.01...1.05, the default being 1.03.