Mitsubishi Electric FR-A720-0.4K Instruction Manual page 124

Speed control by real sensorless vector
control, vector control
(4) Setting torque bias amount with terminal 1 (Pr. 840 = "3")
⋅ C16 Terminal 1 bias command (torque/magnetic flux), C17 Terminal 1 bias (torque/magnetic flux), C18 Terminal 1 gain
command (torque/magnetic flux), C19 Terminal 1 gain (torque/magnetic flux), and Pr. 846 Torque bias balance compensation
can be set automatically according to the load.
⋅ When torque command is set from terminal 1, set "6" in Pr. 868 Terminal 1 function assignment.
⋅ Setting C16, C17 (Pr. 919) , C18, C19 (Pr. 920)
Operation without a
load
Press .
(setting C18, C19
(Pr. 920) is completed)
⋅ Setting Pr.846
Operation with a
balanced load
CAUTION
When starting torque bias operation after completion of automatic setting, set "1 or 2" in Pr. 840.
(5) Torque bias operation
⋅ When a value other than 9999 is set in Pr. 844 Torque bias filter, you can slow the rise of torque. At this time, the
torque rises according to the time constant of the primary delay filter.
⋅ Set the time for output torque be maintained with the torque bias command value alone in Pr. 845 Torque bias operation time.
Torque bias filter
primary delay time
* When pre-excitation is not made, the torque bias functions simultaneously with the start signal.
CAUTION
⋅ When torque bias is made valid and "6" is set in Pr. 868 , terminal 1 serves as torque command not as frequency setting auxiliary.
When override compensation is set by Pr. 73 and terminal 1 acts as main speed, no main speed (main speed = 0Hz) is slected.
⋅ Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Make
setting after confirming the function of each terminal.
Reference parameters
⋅ Pr. 73 Analog input selection
⋅ Pr. 178 to Pr. 189 (input terminal function selection)
⋅ C16 to C19 (torque setting voltage (current) bias and gain)
114
Read C16, C17
(Pr. 919) when
speed is stable
Read C18, C19
(Pr. 920) when
speed is stable
Read Pr. 846
Speed
Torque bias
Pr. 844
constant
Output torque
Time when torque is
Pr. 845
generated by
torque bias setting
Pre-excitation LX
*
Start signal
Refer to page 274.
Refer to page 221.
Refer to page 285.
Press .
(setting C16, C17
(Pr. 919) is completed)
Operation with a
maximum load
Press .
Torque balance
compensation under
power driving is
completed.