Yaskawa Matrix Converter User Manual download pdf (Page 205)

6-40

 Limiting Motor Torque (Torque Limit Function)

The motor torque limit function is enabled with Flux Vector Control and Open Loop Vector Control.

In the Open Loop Vector Control and Flux Vector Control, the user-set value is applied to the torque limit by

internally calculating the torque output by the motor. Enable this function to keep the MxC from applying

torque above a specified amount, or to limit the amount a regenerative energy created by the motor.

Related Parameters

Parameter

Number

Name

Description

Setting

Range

Default

Change

during

Run

Control Methods

Display

V/f

Open

Loop

Vector

Flux

Vector

L7-01

Forward Torque

Limit

Sets the torque limit value as a percentage of

the motor rated torque. Four individual quad-

rants can be set.

0 to 300 200% No No A A

Torq Limit Fwd

L7-02

Reverse Torque

Limit

0 to 300 200% No No A A

Torq Limit Rev

L7-03

Forward Regenera-

tive Torque Limit

0 to 300 200% No No A A

Torq Lmt Fwd Rgn

L7-04

Reverse Regenera-

tive Torque Limit

0 to 300 200% No No A A

Torq Lmt Rev Rgn

L7-06

Torque Limit Inte-

gral Time Constant

Sets the torque limit value as a percentage of

the motor rated torque. Four individual quad-

rants can be set.

5 to

10,000

200 ms No No A No

Torq Det 2 Tim

L7-07

Torque Limit Con-

trol Method Selec-

tion During Accel/

Decel

Selects the method of torque limit controls

during accel/decel

0: Proportional Controls (uses integral con-

trols at fixed speeds).

1: Integral Controls

Adjustment is not normally required. With

applications that require torque limits during

accel/decel, integral controls (setting value =

1) are used when torque controls take prece-

dence. When torque limit is applied to the

motor, accel/decel time may increase and

motor speed may not run at the indicated

speed reference.

0, 1 0 No No A No

Torq Lmt Sel

Output torque

Positive torque

Reverse

Negative torque

No. of

motor

rotations

Forward

Regenerative

state

Regenerative

state

1 2 ... 200 201 202 203 204 205 206 207 208 209 210 ... 397 398

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Yaskawa Matrix Converter User Manual Page 205

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