Page 27 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
Additional protections The Ekip T&P module, and the Ekip Connect software, allow you to set some protections not available via
dip-switch:
• Thermal Memory
• T Protection
• Prealarm threshold
• Hardware Trip
Thermal Memory
The function, which is available for L and S protections, allows overheating in the cables connected to the
circuit-breaker to be prevented: in the case of trips within brief intervals, the unit considers the time between
commands and the entity of the faults so as to reduce opening time.
IMPORTANT: for the S protection the function can be activated if the selected curve
is time-dependent.

NOTE: the function also reduces the trip time in the case of overloads which have not led to
the open command (longer than 100ms)

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 < -40 °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
If enabled, the protection activates if one or more disconnections of the current sensors, Rating plug, Trip coil
or an alarm inside the unit are detected.
The protection activates with a TRIP if the disconnections persist for more than one second; in the case of
Trip coil disconnection, the unit merely handles alarm signaling.

25 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Dip | 1 - Protections - Introduction