Page 60 - Sace Emax 2 Manual for design engineers

Continued from the previous page ABB | SACE Emax 2
Limitations and additional functions
2
• in the presence of curve t= k/I , the protection trip time is forced to t4 if the calculation results give a
theoretical value lower than t4 itself
• in the absence of Vaux, the minimum threshold is 0.3 In (for In <= 100 A), 0,25 In (for In <= 400 A) or 0.2 In
(for all the other sizes); if lower values are set, the Trip unit forces the threshold to the minimum admissible
value and the "Configuration" error appears
• depending on the I4 threshold setting, the protection deactivates for an Ig higher than: 8 In with threshold
I4 ≥ 0.8 In; 6 In with 0.8 In > I4 ≥ 0.5 In; 4 In with 0,5 In > I4 ≥ 0,2 In; 2 In with I4 > 0.2 In
• with t4=instantaneous operation is guaranteed in the presence of Vaux; in self-supply mode, the Trip unit
forces the time to 100 ms and the "Configuration" error appears
• 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, some parameters have different maximum values: I4 maximum =
1200A, Startup maximum = 1200A, t4 maximum = 400ms

Protection MCR Function
The protection remains activated for a time interval running from the open - closed change of status of the
t CB, after which it deactivates.
I3 MCR
If, during this time interval, the current of one or more phases exceeds threshold I3, the protection transmits
the TRIP command after a non-programmable fixed time.
The MCR protection only functions with Vaux or with supply via the Measurement enabler with voltage
sockets module.
I To check and simulate the trip times in relation to all the parameters, please consult:
• summary table of the protections with the operating characteristics (page 92)
• the graph with trip curve (page 99)
NOTE: to activate MCR, protection I must be disabled
Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu.
Establishes the value that activates the protection.
Threshold I3 The value is given as both absolute value (A) and relative value (In) and 6 In
can be set within the range: 1.5 In to 15 In, in 0.1 In steps
Defines the time interval in which the MCR protection remains
activated, as calculated from the open - closed change of status
Monitor Time 0,04 s
The value is given in seconds and can be set within the range: 0.04 s
to 0.5 s, in 0.01 s steps

Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or
communication via system bus (page 80)

58 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Touch - Protections | 2 - Standard Protections