7.3 Torque Limit Function. Mitsubishi MOTION CONTROLLERS Q172DCPU

7 AUXILIARY AND APPLIED FUNCTIONS

7.3 Torque Limit Function

This function restricts the generating torque of the servomotor within the setting range.

If the torque required for control exceeds the torque limit value during positioning control, it restricts with the setting torque limit value.

(1) Setting range of the torque limit value

It can be set within the range of 1 to 1000[%] of the rated torque.

(2) Setting method of torque limit value

Set the torque limit value is shown below.

(a) Setting in the parameter block (Refer to Section 4.3).

Set the torque limit value in the parameter block.

By setting the parameter block No. used in the servo program, it can be restricted the generating torque of the servomotor within the specified torque limit value for every positioning control.

(b) Setting in the servo program

By setting the torque limit value in the servo program, it can be restricted the generating torque of the servomotor within the specified torque limit value at the execution of the servo program.

(c) Setting in the Motion SFC program

By executing the torque limit value change request (CHGT) in the Motion

SFC program or operating control step, it can be set the generating torque of the servomotor within the specified torque control value.

(Refer to the "Q173DCPU/Q172DCPU Motion controller (SV13/SV22)

Programming Manual (Motion SFC)" for details.

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7 AUXILIARY AND APPLIED FUNCTIONS

Example

Setting for the torque limit value with the constant-speed control (CPSTART 1)

(1) Servo program

Parameter block 3 (P.B.3) setting at the start

Setting items of the parameter block

Torque limit value setting from the pass point (P1)

(2) Parameter block

Torque limit value setting

(3) Operation description

Constant-speed control V

1

P1

Torque limit to the servo amplifier

0

300[%]

40000

P2

60000

50[%]

Torque control with torque limit value

(300[%]) of the parameter block 3 (P.B.3).

Torque control with torque limit value

(50[%]) of the servo program.

Parameter block or torque limit value specified with the servo program at the start.

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