Yaskawa Matrix Converter User Manual download pdf (Page 207)

6-42

Setting Torque Limits Using Parameters and an Analog Input

The following block diagram shows the relationship between the torque limit using parameters and the torque

limit using an analog input.

Fig 6.36 Torque Limit Using Parameters and an Analog Input

Selecting the Control Method for Torque Limit during Acceleration and Deceleration

L7-07 is used to select the control method for the torque limit during acceleration and deceleration. The selec-

tions are proportional control and integral control. For applications such as presses, in which the torque limit

will be reached during acceleration and deceleration, torque control can be given priority by selecting integral

control. To increase the change in frequency for the torque limit when integral control is selected, decrease the

value set for L7-06 (Torque Limit Integral Time Constant).

Setting Precautions

• When the torque limit function is operating, control and compensation of the motor speed is disabled

because torque control is given priority. Therefore, the acceleration and deceleration times may increase or

the number of motor rotations may decrease.

• When using the torque limit to raise and lower loads, do not carelessly lower the torque limit value, as this

may cause the load to slip or fall.

• Torque limits using an analog input are the upper limit value (during 10 V or 20 mA input) of 100% of the

motor rated torque. To make the torque limit value during 10 V or 20 mA input 150% of the rated torque,

set the input terminal gain to 150.0 (%). Adjust the gain for multi-function analog input terminal A2 using

H3-10 and for multi-function analog input terminal A3 using H3-06.

• The torque limit accuracy is ±5% at the output frequency of 10 Hz or above. When output frequency is less

than 10 Hz, accuracy is lowered.

• When the torque is limited while L7-07 is set to 1 (integral control), the acceleration and deceleration

times may increase or the motor speed may not agree with the speed reference value.

Multi-function analog input

Terminal

A2 or A3

Forward torque limit

(set value = 10)

Negative torque limit

(set value = 11)

Regenerative torque limit

(set value = 12)

Positive/negative torque limit

(set value = 15)

Forward positive torque (motoring)

Reverse positive torque (regen)

Forward negative torque (regen)

Reverse

negative

torque

(regen)

Min: Minimum value priority circuit

Parameter

Forward Torque Limit

(L7-01)

Reverse Torque Limit

(L7-02)

Forward Regenerative Torque

Limit (L7-03)

Reverse Regenerative Torque

Limit (L7-04)

170% of MxC rated current

Forward torque limit

Reverse torque limit

Forward regenerative

torque limit

Reverse regenerative

torque limit

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Yaskawa Matrix Converter User Manual Page 207

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