ABB | SACE Tmax XT
72 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
Protections | 14 - Motor protections
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 89)
• the graph with trip curve (page 106)
Parameters
Parameter
Description
Default
Enable
Activates/deactivates the protection and its availability in the
parameters menu
OFF
Trip Enable
Activates/deactivates transmission of the open command: if disabled,
the alarm and exceedance of protection time are only managed as
information
OFF
Threshold Ij
Establishes the value that activates the protection.
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
1,0 Ir
Time tj
This is the trip time of the protection; the value is given in seconds and
can be set within a range: 2 s to 10 s, in 0.5 s steps
2 s
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 78).
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 89)
• the graph with trip curve (page 107)
Parameters
Parameter
Description
Default
Enable
Activates/deactivates the protection and its availability in the
parameters menu
OFF
Trip Enable
Activates/deactivates transmission of the open command: if disabled,
the alarm and exceedance of protection time are only managed as
information
OFF
Threshold Is
Establishes the value that activates the protection.
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
2,0 Ir
Time ts
This is the trip time of the protection; the value is given in seconds and
can be set within a range: 1 s to 10 s, in 0.5 s steps
1 s
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 78).
