Torque Control Operation - Mitsubishi Electric FR-V500 Series Instruction Manual

Torque control operation

4.2 Torque control operation
4.2.1 Torque control
Torque control is exercised to develop torque as set in the torque command. The motor speed becomes constant
when the motor output torque and load torque are balanced. For torque control, therefore, the speed is determined
by the load.
For torque control, the motor gains speed as the motor output torque becomes greater than the motor load. Here,
set the speed limit value so that the motor speed does not increase too high. The speed limit value is set in the
following method. When speed limit is not set, the speed limit value setting is regarded as 0r/min to disable torque
control.
(Torque control is disabled under speed limit. (Speed control is performed.))
4.2.2 Operation transition
Speed limit value is
increased up to preset value
according to the Pr.7
"acceleration time" setting.
Speed
Speed limit
Start signal
Output torque
* Speed control is peformed during speed limit. (thus, torque according to the command is not developed)
REMARKS
When the load is smaller than torque command, the speed increases up to the speed limit value.
When "0" is set in Pr. 7 or Pr. 8 "acceleration/deceleration time"
Terminal STF
Speed
0r/min
Output torque
Speed limit value
Torque control
*
OFF
10V
0V
Speed limit value
150%
0
Speed limit value is decreased
down to zero according to the Pr.8
"deceleration time" setting.
Speed
Speed limit
Output torque is provided
according to the terminal 3
setting.
ON
Speed limit
Torque control
Limit by the torque
limit value
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