ABB | SACE Emax 2Ekip Dip protection trip unit | 2 - Protections37 | © 2017 ABB | 1SDH000999R0002 - ECN000058721 - Rev. B2 - ProtectionsL ProtectionLI1tt1IThe L protection protects against overloadsNOTE: the protection is available and active for all the versions of the trip unit.When the activation threshold is exceeded, the protection trips in a time that decreases as the current readincreases.ParametersAll the parameters that can be modified by the user affect the response curve, and related tripping times.Parameter DescriptionThreshold I1The value I1 contributes in calculating the tripping time, and also defines the currentvalue that, if exceeded, activates the protection (with reference to the curve, it is thepart parallel to the y-axis).IMPORTANT:• The protection is activated and starts timing for currents between1.05 and 1.2 of the threshold I1 set (1) .• The delay is interrupted if the current drops below the activationthreshold.Time t1The value t1 contributes in calculating the tripping time (with reference to the curve,T1 affects the entire curve by shifting it as a whole along the y-axis).IMPORTANT:The protection limits the tripping time to 1 second in two cases:• if according to the calculation the time is less than 1 second.• If the fault current is greater than 12 In.(1) Example (with I1 set to 400 A): the protection is activated for currents between 420 A and480 A.With the modules Ekip T&P or Ekip Bluetooth and with the Ekip Connect software, it is possible to activatethe function Thermal Memory, and adjust the threshold of Pre-alarm. See page 42.
