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MELSEC-Q
12 CONTROL SUB FUNCTIONS
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 QD75, 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 QD75.)
The details shown below explain about the "torque change function".
[1] Control details
[2] Precautions during control
[3] Setting the torque change function start signal
[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 QD75. (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.
50%
100%
0%
Torque is limited by the torque
limit setting value (50%) of the
parameters.
Various operations
PLC READY signal [Y0]
25%
0%
OFF
ON
V
t
Pr.17 Torque limit setting value
Cd.22 New torque value
Md.35 Torque limit stored value
50%
100%
Torque is limited by the new
torque value (25%) of the
axis control data.
25%
25%
Ignores the new torque.
Fig. 12.31 Torque change operation