Mitsubishi Electronics FR-V500 instruction manual Torque control operation

Torque control operation

4.2 Torque control operation

4.2.1Torque control

Torque control is exercised to develop torque as set in the torque command. The motor speed becomes constant when the motor output torque and load torque are balanced. For torque control, therefore, the speed is determined by the load.

For torque control, the motor gains speed as the motor output torque becomes greater than the motor load. Here, set the speed restriction value so that the motor speed does not increase too high. The speed restriction value is set in the following method. When speed restriction is not set, the speed restriction value setting is regarded as 0r/min to disable torque control.

(Toruque control is disabled under speed restriction. (Speed control is performed.))

4.2.2Operation transition

Speed restriction value is increased up to preset value according to the Pr.7 "acceleration time" setting.

Speed Speed restriction

Start signal

*

Output torque

Speed restriction value

Torque control

Speed restriction value is decreased down to zero according to the Pr.8 "deceleration time" setting.

Speed

Speed restriction

Output torque is provided according to the No. 3 terminal setting.

* Speed control is peformed during speed restriction. (thus, torque according to the command is not developed)

REMARKS

When the load is smaller than torque command, the speed increases up to the speed restriction value.

!When "0" is set in Pr. 7 or Pr. 8 "acceleration/deceleration time"

OFF	ON
Terminal STF
10V
0V
	Speed restriction value
	Speed restriction
Speed	Torque control
0r/min
	150%
Output torque	Limit by the torque
0
	restriction value

4

CONTROL

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