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DSE7200 / 7300 Series Operators Manual

104

8.9 SHORT CIRCUIT ALARM

If the Short Circuit alarm is enabled, the controller begins following the IDMT ‘curve’. If the Trip is surpassed for an

excess amount of time the Alarm triggers (Shutdown or Electrical trip as selected in Action).

The higher the Short Circuit, the faster the trip. The speed of the trip is dependent upon the fixed formula :

T = K x 0.14 / ((I / I

)

0.02

-1)

Where: T is the tripping time in seconds (accurate to +/- 5% or +/- 50ms (whichever is the greater)

K is the time multiplier setting

I is the actual current measured

Is is the trip setting value

The settings shown in the example above are a screen capture of the DSE factory settings, taken from the DSE

Configuration Suite software.

(Trip setting

value)

K (time multiplier setting)

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 121 122

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