Mitsubishi Electric FR-A720-0.4K Instruction Manual page 132

Torque control by real sensorless vector
control, vector control
(3) Torque command using parameters (Pr. 804 = "1")
Torque command value
400%
600%
1000%
-400%
REMARKS
⋅ When torque command is set in Pr. 805 (RAM), powering off the inverter will erase the changed parameter values. Therefore,
the parameter value available when power is switched on again is the value set in Pr. 806 (EEPROM).
CAUTION
⋅ When giving a torque command by parameter setting, set the speed limit value to an appropriate value to prevent overspeed.
(Refer to page 123.)
(4) Torque command by CC-Link communication (Pr. 804 = "3, 5, 6")
⋅ Writing a value to Pr. 805 or Pr. 806 using the FR-A7NC (communication option) sets the torque command value.
⋅ When "3 or 5" is set in Pr.804, torque command can be set in remote resister RWw1 or RWwC using the FR-A7NC
(communication option).
⋅ By setting "5, 6" in Pr.804, the range of torque command setting from FR-A7NC (communication option) is set from
-327.68% to 327.67% (0.01% increments).
Pr. 804 Setting
1 Torque command by parameter setting (Pr. 805 or Pr. 806)
Torque command by parameter setting (Pr. 805 or Pr. 806)
3
Torque command from remote resister (RWw1 or RWwC)
with using CC-Link communication (FR-A7NC)
Torque command by parameter setting (Pr. 805 or Pr. 806)
without using CC-Link communication (FR-A7NC)
Torque command by parameter setting (Pr. 805 or Pr. 806)
5
with using CC-Link communication (FR-A7NC)
Torque command from remote resister (RWw1 or RWwC)
with using CC-Link communication (FR-A7NC)
Torque command by parameter setting (Pr. 805 or Pr. 806)
without using CC-Link communication (FR-A7NC)
6
Torque command by parameter setting (Pr. 805 or Pr. 806)
with using CC-Link communication (FR-A7NC)
REMARKS
For details of the setting with the FR-A7NC, refer to the FR-A7NC instruction manual.
(5) Torque command by 16 bit digital input (Pr. 804 = 4)
⋅ Give a torque command by 16 bit or 12 bit digital input using the FR-A7AX (plug-in option).
REMARKS
For details of the setting with the FR-A7AX, refer to the FR-A7AX instruction manual.
(6) Change the torque characteristics in the constant power (Pr. 803)
Torque
Constant power range
Constant torque range
Base speed
♦Parameters referred to♦
Pr. 868 Terminal 1 function assignment
Calibration parameter C16 (Pr. 919) to C19 (Pr. 920) (terminal 1 bias, gain torque)
122
Pr.805,Pr.806
settings
1400%
Torque command value
=Pr.805(or Pr.806)-1000%
Torque Command Source
Pr. 803 = 1:
constant torque command
Pr. 803 = 0:
constant power command
(torque reduction)
Speed
Refer to page 98.
⋅ Torque command value can be set by setting Pr. 805
Torque command value (RAM) or Pr. 806 Torque command
value (RAM,EEPROM) .
⋅ For Pr. 805 or Pr. 806, the torque command is set by an
offset from 1000% on the assumption that 1000% is 0%.
The relationship between the Pr. 805 or Pr. 806 setting
and actual torque command value at this time is shown
on the left.
⋅ When changing the torque command frequently, write to
Pr. 805. Performing frequent parameter write to Pr. 806 will
shorten the life of the EEPROM.
Setting Range
600 to 1400 (-400% to 400%)
600 to 1400 (-400% to 400%)
600 to 1400 (-400% to 400%)
-32768 to 32767 (two's complement)
(-327.68% to 327.67%)
-32768 to 32767 (two's complement)
(-327.68% to 327.67%)
600 to 1400 (-400% to 400%)
-32768 to 32767 (two's complement)
(-327.68% to 327.67%)
⋅ Due to the motor characteristics, torque is reduced at or
above the base frequency. Set "1" in Pr. 803 Constant
power range torque characteristic selection when you want
to keep the torque to be constant even at or above the
base frequency.
Refer to page 288
Increments
1%
1%
1%
0.01%
0.01%
1%
0.01%