YASKAWA Varispeed L7 User Manual

Protective Functions
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5
 Limiting Motor Torque (Torque Limit Function)
This function allows limitation of motor shaft torque independendly for each of the four quadrants. The torque
limit can be set as fixed value using parameters or as 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
* A setting value of 100% is equal to the motor rated torque.
Multi-function Output (H2-01 to H2-03)
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 Fig 5.17)
Fig 5.17 Torque Limit Paremeters
Using a Digital Output to Signalize Operation at the Torque Limit
If a multifunction output is set for 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.
Parameter
No.
Name
Factory Set-
ting
Change dur-
ing Opera-
tion
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
L7-01 Forward drive torque limit 200%* No No A A
L7-02 Reverse drive torque limit 200%* No No A A
L7-03 Forward regenerative torque limit 200%* No No A A
L7-04 Reverse regenerative torque limit 200%* No No A A
L7-06 Torque limit time constant 200 ms No No A No
L7-07 Torque limit operation during accel./decel. 0 No No A No
Set
Value
Function
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
30 During torque limit No Yes Yes
L7-01
Output Torque
Output Speed
L7-03
L7-02
L7-04
Forward
Drive
Reverse
Drive
Reverse
Regenerative
Forward
Regenerative
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YASKAWA Varispeed L7 Specifications

General

Brand	YASKAWA
Model	Varispeed L7
Category	Inverter
Language	English