ABB SACE Tmax XT5 Operation And Maintenance Manual page 71

Protection R JAM Function
Protection R STALL Function
69 | © 2019 ABB | 1SDH002039A1002 - ECN000093027 - Rev. A
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 81)
• the graph with trip curve (page 95)
Parameters
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as
information
Establishes the value that activates the protection.
Threshold Ij The value is given as both absolute value (Amperes) and relative 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 seconds and
Time tj
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 75).
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 81)
• the graph with trip curve (page 96)
Parameters
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as
information
Establishes the value that activates the protection.
Threshold Is The value is given as both absolute value (Amperes) and relative 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 seconds and
Time ts
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 75).
ABB | SACE Tmax XT
Default
OFF
OFF
1,0 Ir
2 s
Default
OFF
OFF
2,0 Ir
1 s
Protections | 8 - Motor protections