Mitsubishi Electric 800 Series Instruction Manual page 143

Control method
Changing the control mode with external terminals (MC signal)
• To use ON/OFF of the MC signal to switch the control mode, set Pr.800 or Pr.451. Refer to
Pr.451.
To input the MC signal, set "26" in any of Pr.178 to Pr.189 (Input terminal function selection) to assign the function.
• When using an analog input terminal (terminal 1, 4) for torque limit and torque command, switching of the control mode
changes the terminal function as shown below.
• Functions of the terminal 1 under different control modes
Speed control/torque control
Pr.868
setting Speed control
(MC signal-OFF)
0 Speed setting
(initial value) assistance
Magnetic flux
1
command

Regenerative
2 torque limit
(Pr.810=1)
3 ―
Torque limit
4
(Pr.810=1)
5 ―
6 ―
9999 ―
• Functions of the terminal 4 under different control modes
Speed control/torque control
Pr.858
setting Speed control
(MC signal-OFF)
0 Speed command
(initial value) (AU signal-ON)
Magnetic flux
1
command

Torque limit
4
(Pr.810=1)

9999 ―

Real sensorless vector control (Pr.800="12"), vector control (Pr.800="2")

Vector control (Pr.800="4")

Vector control (Pr.800="5")

Enabled under vector control

Disabled when Pr.868="1".

Disabled when Pr.868="4".
―: No function
NOTE
• Switching between the speed control and the torque control is always enabled regardless of the motor status: in a stop, in
running, or in DC injection brake (during pre-excitation).
• During operation, switching between speed control and position control or between torque control and position control occurs
when the output frequency reaches Pr.865 Low speed detection or lower with no position command provided.
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
Parameters referred to ???????
Pr.178 to Pr.189 (Input terminal function selection)
Pr.450 Second applied motor
Pr.804 Torque command source selection
Pr.807 Speed limit selection
Pr.810 Torque limit input method selection
Pr.858 Terminal 4 function assignment, Pr.868 Terminal 1 function assignment
142
PARAMETERS
switchover

Torque control
(MC signal-ON) (MC signal-OFF)
Speed limit Speed setting
assistance assistance
Magnetic flux Magnetic flux
command command

Regenerative
― torque limit
(Pr.810=1)
Torque command
―
(Pr.804=0)
Torque command Torque limit
(Pr.804=0) (Pr.810=1)
Forward/reverse
rotation speed limit ―
(Pr.807=2)
― Torque bias
― ―
switchover

Torque control
(MC signal-ON) (MC signal-OFF)
Speed limit Speed command
(AU signal-ON) (AU signal-ON)
Magnetic flux Magnetic flux
command command

Torque limit
―
(Pr.810=1)
― ―
page 415
page 423
page 190
page 195
page 154
Speed control/position control
switchover

Speed control Position control
(MC signal-ON)
―
Magnetic flux
command

Regenerative
torque limit
(Pr.810=1)
―
Torque limit
(Pr.810=1)
―
―
―
Speed control/position control
switchover

Speed control Position control
(MC signal-ON)
―
Magnetic flux
command

Torque limit
(Pr.810=1)

―
page 397
page 138 and set Pr.800 or
Position control/torque control
switchover
Position control
(MC signal-OFF)
―
Magnetic flux
command

Regenerative
torque limit
(Pr.810=1)
―
Torque limit
(Pr.810=1)
―
―
―
Position control/torque control
switchover
Position control
(MC signal-OFF)
―
Magnetic flux
command
 
Torque limit
(Pr.810=1)
 
―

Torque control
(MC signal-ON)
Speed limit
assistance
Magnetic flux
command
―
Torque command
(Pr.804=0)
Torque command
(Pr.804=0)
Forward/reverse
rotation speed limit
(Pr.807=2)
―
―

Torque control
(MC signal-ON)
Speed limit
(AU signal-ON)
Magnetic flux
command

―
―