Mitsubishi Electronics QD75P, QD75D user manual Torque change function, Torque change operation

12CONTROL SUB FUNCTIONS

12.5.4 Torque change function

MELSEC-Q

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.

V

Various operations

t

		ON
PLC READY signal	[Y0] OFF
Pr.17 Torque limit setting value100%		50%
Cd.22 New torque value
	0%	25%	0%

Torque is limited by the torque

limit setting value (50%) of the

parameters.

Torque is limited by the new
torque value (25%) of the	Ignores the new torque.
axis control data.

Md.35 Torque limit stored value100% 50% 25% 25%

Fig. 12.31 Torque change operation

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