ABB SACE Emax 2 Series Operating Instructions Manual page 64

Protection MCR
t
I3
61 | © 2023 ABB | 1SDH001330R1002 - ECN000297030
Continued from the previous page
Limitations and additional functions
• in the presence of curve t= k/I
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 83)
• with CB in UL standard configuration, some parameters have different maximum values: I41
maximum = 1200A, Startup maximum = 1200A, t4 maximum = 400ms
Function
The protection remains activated for a time interval running from the open - closed change of status of
the CB, after which it deactivates.
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.The MCR protection only functions with Vaux or with supply
via the Measurement enabler with voltage sockets module.
To check and simulate the trip times in relation to all the parameters, please consult:
I
• summary table of the protections with the operating characteristics (page 95)
• the graph with trip curve (page 102)
NOTE: to activate MCR, protection I must be disabled
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
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 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
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
Activates/deactivates the function
ZoneSelectivity
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 83)
, the protection trip time is forced to t4 if the calculation results
2
NOTE: if at least two of the selectivity S, S2, I, 2I and MCR
are enabled, the input and output are shared with the OR
function; it is sufficient that even a selectivity is activated to
stimulate inputs and outputs
ABB | SACE Emax 2
Default
OFF
6 In
0,04 s
OFF
Ekip Touch - Protections
2 - Standard Protections