Page 56 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
S Protection Function
If the current of one or more phases exceeds threshold I2, the protection trips and, after a time established
t by the value read and by the parameter settings, transmits the TRIP command.
I2 S To check and simulate the trip times in relation to all the parameters, please consult:
• the summary table of the protections with the calculation formulas (page 92)
• the graph with trip curve (page 98)
t2
Parameters
I Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu.
Activates/deactivates transmission of the open command. if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as ON
information.
Establishes curve dynamics and the threshold or trip time calculation:
Curve • t = k: fixed time trip t = k
• t = k/I : inverse time-delay dynamic trip
2
Establishes the value that activates the protection and contributes
towards calculating the trip time.
Threshold I2 4 In
The value is given as both absolute value (A) and relative value (In) and
can be set within the range: 0.6 In to 10 In, in 0.1 In steps
It is the trip time or contributes towards timing calculation, depending
on the type of curve selected.
Time t2 0,05 s
The value is given in seconds and can be set within the range: 0.05 s
to 0.8 s, in 0.01 s steps
Activates/deactivates the thermal memory function (page 80)
Thermal NOTE:the function is only available with curve t=k/I 2 OFF
memory

Activates/deactivates the function and selectivity time availability on
the display (page 80)
ZoneSelectivity OFF
NOTE:the function is only available with curve t=k

This is the trip time of the protection with the zone selectivity function
activated and selectivity input not present (page 80)
Selectivity time 0,04 s
The value is given in seconds and can be set within the range: 0.04 s
to 0.2 s, in 0.01 s steps
Activates/deactivates the function and availability of the associated
StartUp enable OFF
parameters on the display (page 83)
Protection threshold valid during Startup time, in the conditions in
StartUp which the function is activated (page 83) 0,6 In
Threshold The value is given as both absolute value (A) and relative value (In) and
can be set within the range: 0.6 In to 10 In, in 0.1 In steps
This is the time for which the StartUp threshold remains activated and
is calculated from the moment the activation Threshold is exceeded
StartUp Time (page 83) 0.1 s
The value is given in seconds and can be set within the range: 0.1 s to
30 s, in 0.01 s steps

Limitations and additional functions
• threshold I2 must be higher than threshold I1 (if S protection is activated)
• in the presence of curve t= k/I , the protection trip time is forced to t2 if the calculation results give a
2
theoretical value lower than t2 itself
• the block functions and type of selectivity can also be accessed by means of the service connector (via
Ekip Connect) or communication via system bus (page 80)
• with CB in UL standard configuration, the maximum value of t2 is 400 ms

54 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Touch - Protections | 2 - Standard Protections