Torque Limit - Toshiba TOSVERT VF-MB1 Instruction Manual

6.22 Torque limit

6.22.1 Torque limit switching
f441 : Power running torque limit 1
f443 : Regenerative braking torque
f444 : Power running torque limit 2
 Function
This function is to decrease or increase the output frequency according to the loading condition when the
motor torque reaches the limit level. Setting a torque limit parameter at 250% means "Invalid."
With this function, you can also select from between limiting the constant output or limiting the constant
torque in the constant output zone.
This function is not operate when the parameter =,,7setting.
6
Setting methods
When setting limits to torque, use internal parameters (Torque limits can also be set with an external control device.)
Reverse run
With the parameter f454 , you can select the item that is limited in the constant output zone (somewhat weak
magnetic field) from between constant output ( f454 = 0 : default setting) and constant torque ( f454 = 1 ).
When you select the constant torque limit option, you should preferably select the output voltage limit option
( f307 = 1 ) with the parameter f307 (base frequency voltage selection).
level
limit 1 level
level
Positive torque

Regenerative
Power
running

Negative torque
f445 : Regenerative braking torque
limit 2 level
f454 : Constant output zone torque
limit selection

Power
running
Regenerative

F-70
E6581697
+250% torque
: =
: =
Forward run
-250% torque