Limiting The Motor Torque (Torque Limit Function) - Omron VARISPEED L7 Manual

Limiting the Motor Torque (Torque Limit Function)

This function allows limitation of motor shaft torque independently for each of the four quadrants. The torque
limit can be set as a fixed value using parameters or as a variable value using an analog input. The torque limit
function can be used with Open Loop Vector and Closed Loop Vector control only.
Related Parameters
Parameter No.
L7-01 Forward drive torque limit
L7-02 Reverse drive torque limit
L7-03 Forward regenerative torque limit
L7-04 Reverse regenerative torque limit
L7-06 Torque limit integral time constant
Torque limit integral operation during accel./
L7-07
decel. selection
* A setting value of 100% is equal to the motor rated torque.
Multi-function Output (H2-01 to H2-03)
Set
Value
30 During torque limit
Setting the Torque Limit Using Parameters
Using L7-01 to L7-04, four torque limits in the following directions can be set individually: Forward drive,
reverse drive, forward regenerative and reverse regenerative (see
Using a Digital Output to Signalize Operation at the Torque Limit
If a multifunction output is set to this function (H2-01 to H2-03 is set to "30"), the output is switched ON
when the motor output torque reaches one of the torque limits.
Factory Set-
Name
ting
300%*
300%*
300%*
300%*
200 ms
0
Function
Output Torque
L7-01
L7-04
Forward
Reverse
Drive
Regenerative
Forward
Reverse
Regenerative
Drive
L7-03
L7-02
Fig 6.18 Torque Limit Parameters
Control Methods
Change dur-
Open
ing Opera-
V/f Loop
tion
Vector
No - A
No - A
No - A
No - A
No - A
No - A
Control Methods
Open Closed
V/f Loop
Vector Vector
No Yes
Fig 6.18)
Output Speed
Closed
Closed
Loop
Loop
Vector
Vector
(PM)
A A
A A
A A
A A
- -
- -
Closed
Loop
Loop
Vector
(PM)
6
Yes Yes
43
6-