Iinst; Additional Functions - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

Additional functions Functions
71 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
Iinst The purpose of this protection is to maintain the integrity of the circuit-breaker and installation in the case
of particularly high current values requiring shorter reaction times than those provided by the instantaneous
short-circuit-protection.
The protection cannot be disabled, and the tripping threshold and time are defined by ABB.
For some protections there are functions available that extend the functionality:
Protection
Thermal memory
Trip Enable
Zone Selectivity
StartUp enable
Blocks
Thermal Memory
This function reduces the tripping time of the protection based on the time elapsed between multiple trips
caused by heating of the cables.
IMPORTANT: the parameter can be activated if the function of the selected protection
is t = k / I .
2
Trip enable
It disables the opening command in order to use the protection as an alarm signal, without opening commands.
Zone Selectivity
The function allows multiple circuit-breakers in the same installation to be connected together, in order to
coordinate the trip units and to reduce the tripping times in the case of S and G protections.
The function allows circuit-breakers to be coordinated so that, in the event of a failure:
• The circuit-breaker closest to the fault trips.
• The other circuit-breakers are locked for a programmable time.
For further information see the chapter "1 - Zone Selectivity" on page 156.
StartUp enable
The function allows you to modify the threshold of the protection for a period that can be set by the user. The
period is activated when a threshold is exceeded (startup threshold), which can be programmed by the user
via Ekip Connect software.
IMPORTANT:
• Startup can be activated with a fixed time protection function (t = k).
• The I3 startup threshold must be higher than the I2 startup threshold.
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ABB | SACE Emax 2
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Ekip Touch protection trip unit | 9 - Touch protections
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