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MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.4.2 Torque limit function
The "torque limit function" limits the generated torque to a value within the "torque limit
value" setting range when the torque generated in the servomotor exceeds the "torque
limit value".
The "torque limit function" protects the deceleration function, limits the power of the
operation pressing against the stopper, etc. It controls the operation so that
unnecessary force is not applied to the load and machine.
The details shown below explain about the "torque limit function".
[1] Relation between the torque limit function and various controls
[2] Control details
[3] Precautions during control
[4] Setting the torque limit function
[1] Relation between the torque limit function and various controls
The following table shows the relation of the "torque limit function" and various
controls.
Control type
Torque limit
function
Torque limit value
Machine OPR control
Pr.17
Torque limit setting value
After the "
Pr.47
Creep
speed" is reached, this value
becomes the "
Pr.54
OPR
torque limit value".
OPR
control
Fast OPR control
1-axis linear control
2 to 4-axes linear
interpolation control
1-axis fixed-feed control
2 to 4-axes fixed-feed
control (interpolation)
Position
control
2-axis circular interpolation
control
1 to 4-axes Speed control
Speed-position switching control
Position-speed switching control
Pr.17
Torque limit setting value
Current value changing –
Major
positioning
control
Other
control
JUMP instruction, NOP
instruction, LOOP to
LEND
–
Setting value is invalid.
JOG operation, Inching operation
Pr.17
Torque limit setting value
Manual
control
Manual pulse generator operation
Pr.17
Torque limit setting value
: Set when required (Set to " – " when not used.)
– : Setting not required (Setting value is invalid. Use the initial values or setting values
within a range where no error occurs.)
: Shows the torque limit value when "
Cd.22
New torque value" is set to "0".