Limiting Motor Torque (Torque Limit Function) - YASKAWA CIMR-ACA4011 Instruction Manual

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
L7-01
L7-02
L7-03
L7-04
L7-06
L7-07
-40
6
Name
Display
Forward Torque
Limit
Sets the torque limit value as a percentage of
Torq Limit Fwd
the motor rated torque. Four individual quad-
rants can be set.
Reverse Torque
Limit
Torq Limit Rev
Forward Regenera-
Regenerative
tive Torque Limit
Reverse
state
Torq Lmt Fwd Rgn
Reverse Regenera-
tive Torque Limit
Torq Lmt Rev Rgn
Torque Limit Inte-
Sets the torque limit value as a percentage of
gral Time Constant
the motor rated torque. Four individual quad-
rants can be set.
Torq Det 2 Tim
Torque Limit Con- Selects the method of torque limit controls
trol Method Selec- during accel/decel
tion During Accel/ 0: Proportional Controls (uses integral con-
trols at fixed speeds).
Decel
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-
Torq Lmt Sel
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.
Setting
Description
Range
0 to 300
0 to 300
Output torque
Positive torque
No. of
motor
rotations
0 to 300
Forward
Regenerative
state
Negative torque
0 to 300
5 to
10,000
0, 1
Control Methods
Change
Open
Default during
V/f Loop
Run
Vector
200% No No A
200% No No A
200% No No A
200% No No A
200 ms No No A
0 No No A
Flux
Vector
A
A
A
A
No
No