Torque Control; Torque Command (Pr. 803 To Pr. 806) - Mitsubishi Electric FR-A700 Instruction Manual

Parameter
6.4.3

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. To prevent overspeed, set the speed limit value so that the motor speed
does not increase too high. (Torque control is disabled under speed limit since speed control
is exercised.)
● When speed limit is not set, the speed limit value setting is regarded as 0Hz to disable torque
control.
6.4.4

Torque command (Pr. 803 to Pr. 806)

Torque command source for torque control can be selected.
Pr.
Name
No.
Constant power range
803
torque characteristic
selection
Torque command source
804
selection
Torque command value
805
(RAM)
Torque command value
806
(RAM, EEPROM)
FR-A700 EC
Torque control by real sensorless vector control, vector control
Initial Setting
Description
Value Range
Constant motor
0
output limit
0
Constant torque
1
limit
Torque command by terminal 1 analog
0
input (Refer to section 6.20.6.)
Torque command by parameter setting
1 (Pr. 805 or Pr. 806)
(−400% to +400%)
Torque com-
mand by parame-
ter setting
3 (Pr. 805 or
Pr. 806)
(−400% to
+400%)
4 12 bit/16 bit digital input (FR-A7AX)
0
5
Torque com-
mand by parame-
ter setting
(Pr. 805 or
Pr. 806)
(−400% to
+400%)
6
Writes the torque command value to
the RAM.
1000% 600–1400% On the assumption that 1000% is 0%,
the torque command is set by an offset
from 1000%.
Writes the torque command value to
the RAM and EEPROM.
1000% 600–1400% On the assumption that 1000% is 0%,
the torque command is set by an offset
from 1000%.
Sensorless Sensorless Sensorless Vector Vector Vector
Parameters referred to
Select the torque
868
limit in the con-
stant power region
C16–C19
by torque limit set-
ting.
Torque command
with using CC-Link
communication
(FR-A7NC)
Setting from the
remote resistor
can be made.
(−400% to
+400%)
Torque command
with using CC-Link
communication
(FR-A7NC)
Setting from the
remote resistor
can be made.
(−327.68% to
+327.67%)
Torque command
with using CC-Link
communication
(FR-A7NC))
(−327.68% to
+327.67%)
Refer to
Section
Terminal 1 func- 6.3.2
tion assignment
Terminal 1 bias, 6.20.6
gain torque
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