ABB SACE Tmax XT5 Operation And Maintenance Manual page 47

Protection MCR
t
I3
MCR
45 | © 2019 ABB | 1SDH002039A1002 - ECN000093027 - Rev. A
Continued from the previous page
Ekip M Touch
With Ekip M Touch, G protection features the following differences compared to the other models:
• Block BlockOnStartup enabled and non-editable (page 75)
• StartUp Time non-editable and set with the Motor start-up value, depending on the trip class (page 117)
• curve set as t=k, non-editable
Limitations and additional functions
• in the presence of curve t= k/I
theoretical value lower than t4 itself
• in the absence of Vaux, the minimum threshold is 0.25 In (for In = 300 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
• 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 72)
Function
The protection remains activated for a time interval running from the open - closed change of status of the
CB, after which it deactivates.
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.
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 79)
• the graph with trip curve (page 86)
I
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 10 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
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 72)
, the protection trip time is forced to t4 if the calculation results give a
2
ABB | SACE Tmax XT
Default
OFF
6 In
0,04 s
Protections | 1 - Standard Protections