Additional Protections - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

Additional protections The Ekip T&P and Ekip Bluetooth modules, and the Ekip Connect software, allow you to set some protections
25 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
not available via dip-switch:
• Thermal Memory
• T Protection
• Prealarm threshold
• Hardware Trip
Thermal Memory
This function, available for protections L and S, reduces the tripping time of the protection based on the time
elapsed between multiple trips caused by heating of the cables.
NOTE: for correct calculation of the time between the various trips, the trip unit must have
been powered for at least one 1 second.
IMPORTANT: for the S protection the function can be activated if the selected curve
is time-dependent.
T Protection
T protection protects the circuit-breaker against abnormal temperatures recorded by the protection trip unit.
T protection is always active; via Ekip Connect it is possible to enable tripping, which takes place for
temperatures t < -25 °C or t > 85 °C.
Pre-alarm
The purpose of the pre-alarm, available for L and G protections, is to signal that the measured current is near
the activation threshold of the protection itself.
It is possible to set the pre-alarm threshold in order to establish the pre-alarm activation values; the pre-alarm
threshold is expressed as a percentage in relation to the protection thresholds (I1 and I4) and is adjustable
between 50% and 90% (default value).
Example: with I1 = 0.6 In and pre-alarm threshold L=50 %, the pre-alarm is activated for currents greater
than 0.3 In
The pre-alarm condition is activated for currents higher than the threshold set, and is deactivated for:
• Current less than the pre-alarm threshold.
• Current greater than the activation threshold of protection.
Hardware Trip
Hardware Trip protection protects against internal disconnections of the circuit-breaker. Via Ekip Connect
it is possible to enable the trip command, which is sent if one or more of the following events is detected:
• Current sensors disconnected (internal or external if enabled).
• Rating Plug disconnected.
• Trip Coil disconnected.
• Internal problems with the protection trip unit.
IMPORTANT: the protection trips if the error conditions persist for more than 1 second.
ABB | SACE Emax 2
Ekip Dip protection trip unit | 2 - Protections