Mitsubishi Electronics QD75D, QD75P Setting the torque limit function, Torque limit stored value

12CONTROL SUB FUNCTIONS

[4]Setting the torque limit function

MELSEC-Q

(1)To use the "torque limit function", set the "torque limit value" in the parameters shown in the following table, and write them to the QD75. The set details are validated at the rising edge (OFF ON) of the PLC READY signal (Y0).

	Setting item		Setting	Setting details			Factory-set
			value				initial value
		Torque limit
Pr.17				Set the torque limit value as a percentage.			300
		setting value
				Set the torque limit value after the "		Creep
		OPR torque limit			Pr.47
Pr.54							300
		value		speed" is reached. Set as a percentage.

Refer to Section 5.2 "List of parameters" for setting details.

(2) The "torque limit value" set in the QD75 is set in the " Md.35 Torque limit

stored value". The " Md.35 Torque limit stored value" in the sequence

program is transferred to the "D/A converter module", and the torque is limited.

	QD75
	Buffer memory		Drive unit
PLC CPU
Reading by a		Positioning control
FROM command 826
	Stored torque
	limit value

	D/A convertor module
Writing by a		Torque limiting
TO command

Fig. 12.14 Limiting the torque to the drive unit (Axis 1)

The following table shows the " buffer memory address.

Md.35

Torque limit stored value" of the

Monitor

Buffer memory address

Monitor item

Storage details

Axis

Axis

Axis

Axis

value

1

2

3

4

Torque limit stored

The "torque limit value" valid at that time is

Md.35

stored. (

,

, or

)

826

926

1026

1126

value

Pr.17

Pr.54

Cd.22

Refer to Section 5.6 "List of monitor data" for information on the setting details.

REMARK

•Parameters are set for each axis.

•It is recommended that the parameters be set whenever possible with GX Configurator-QP. Execution by sequence program uses many sequence programs and devices. The execution becomes complicated, and the scan times will increase.

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