ABB SACE Tmax XT2 - Page 67

1SDH002031A1002 ECN000092998 Rev. B SACE Tmax XT2 – XT4 | 67
R JAM Protection
Function
R Jam protects against motor blocks: if the current of one or more phases exceeds the Ij threshold
for a time greater than tj, the protection is activated and sends the TRIP command.
R Jam protection is inhibited during Motor start-up.
To verify and simulate the trip times based on all the parameters, see:
 Protection summary table with the formulas for calculations (page 80)
 Chart with tripping curve (page 94)
Parameters
Parameter
Description
Default
Enable
Enables/disables protection and availability on menu of the
parameters
OFF
Trip Enable
Activates/deactivates the open command: if disabled, the alarm
and the lapsing of the protection time are managed only as
information
OFF
Threshold Ij
Defines the value that activates the protection.
The value is expressed both as an absolute value (A) and as a
relative value (Ir), settable in a range: 2 Ir .. 10 Ir, con step 0.1 Ir
2.0 Ir
Time tj
This is the trip time of the protection; the value is expressed in
seconds, which are settable in a range: 1 s .. 10 s, con step 0.5 s
2 s
Constraints, limitations, and additional functions
From the service connector (with Ekip Connect) or with system bus communication it is also
possible to access the block functions, see page 70.
R STALL
Protection
Function
R Stall protects against motor blocks, but in contrast with R Jam it is not inhibited during Motor
Start-up: if the current of one or more phases exceeds the Ir threshold for a time greater than tr,
the protection is activated and sends the TRIP command.
To verify and simulate the trip times based on all the parameters, see:
 Protection summary table with the formulas for calculations (page 80)
 Chart with tripping curve (page 94)
Parameters
Parameter
Description
Default
Enable
Enables/disables protection and availability on menu of the
parameters
OFF
Trip Enable
Activates/deactivates the open command: if disabled, the alarm
and the lapsing of the protection time are managed only as
information
OFF
Threshold Is
Defines the value that activates the protection.
The value is expressed both as an absolute value (A) and as a
relative value (Ir), settable in a range: 1 Ir .. 10 Ir, con step 0.1 Ir
1.0 Ir
Time ts
This is the trip time of the protection; the value is expressed in
seconds, which are settable in a range: 2 s .. 10 s, con step 0.5 s
2 s
Constraints, limitations, and additional functions
From the service connector (with Ekip Connect) or with system bus communication it is also
possible to access the block functions, see page 70.