Page 66 - MCCB-XT2-XT4

ABB | SACE Tmax XT

Protection R JAM Function
R Jam is a protection against motor block: if the current of one or more phases exceeds threshold Ij for
longer than time tj, the protection activates and sends a TRIP command.
The R Jam protection is inhibited during Motor start-up.
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 77)
• the graph with trip curve (page 92)
Parameters
Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu
Activates/deactivates transmission of the open command: if
Trip Enable disabled, the alarm and exceedance of protection time are only OFF
managed as information
Establishes the value that activates the protection.
The value is given as both absolute value (amperes) and relative
Threshold Ij 1,0 Ir
value (Ir) and can be set within the range: 1 Ir to 10 Ir in 0.1 Ir
steps
This is the trip time of the protection; the value is given in
Time tj 2 s
seconds and can be set within a range: 2 s to 10 s, in 0.5 s steps
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 70).

Protection R STALL Function
R Stall protects against motor block, but unlike R Jam, it is not inhibited during Motor startup-up: if the
current of one or more phases exceeds threshold Ir for longer than time tr, the protection activates and
sends a TRIP command.
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 77)
• the graph with trip curve (page 93)
Parameters
Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu
Activates/deactivates transmission of the open command: if
Trip Enable disabled, the alarm and exceedance of protection time are only OFF
managed as information
Establishes the value that activates the protection.
The value is given as both absolute value (amperes) and relative
Threshold Is 2,0 Ir
value (Ir) and can be set within the range: 2 Ir to 10 Ir in 0.1 Ir
steps
This is the trip time of the protection; the value is given in
Time ts 1 s
seconds and can be set within a range: 1 s to 10 s, in 0.5 s steps
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 70).

64 | © 2022 ABB | 1SDH002031A1002 - ECN000212994 Protections | 9 - Motor protections