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12.5.4
Torque change function
The "torque change function" is used to change the torque limit value during torque limiting.
The torque limit value during torque limiting is normally the value set in the " Pr.17 Torque limit setting value" that was
previously set in the parameters. However, by setting the new torque limit value in the axis control data "[Cd.22] New
torque value", and writing it to the LD75, the torque generated by the servomotor during control can be limited with the
new torque value.
(The "[Cd.22] New torque value" is validated when written to the LD75.)
The details shown below explain about the "torque change function".
• Control details
• Control precautions
• Setting method
(1) Control details
The torque value of the axis control data can be changed at all times. The torque can be limited with a new torque
value from the time the new torque value has been written to the LD75. (a torque change is made only during
operation.)
The toque limiting is not carried out from the time the power supply is turned ON to the time the PLC READY
signal [Y0] is turned ON.
The torque setting range is from 0 to "[Pr.17] Torque limit setting value".
When the new torque value is 0, a torque change is considered not to be carried out.
The torque change range is 1 to "[Pr.17] Torque limit setting value".
The following drawing shows the torque change operation.
Various operations
PLC READY signal
[Y0]
Pr.17 Torque limit setting value
Cd.22 New torque value
Md.35 Torque limit stored value
V
ON
OFF
100%
50%
0%
Torque is limited by the torque
limit setting value (50%) of the
parameters.
100%
50%
CHAPTER 12 CONTROL SUB FUNCTIONS
25%
0%
Torque is limited by the new
torque value (25%) of the
Ignores the new torque.
axis control data.
25%
25%
12
t
557
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