Yaskawa Matrix Converter - Manual (Page 205)

6
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‹ 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