Mitsubishi FR-A800

Control method
PARAMETERS
169
5
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 page 165 and set Pr.800 or
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
• Functions of the terminal 4 under different control modes
 Real sensorless vector control (Pr.800="12"), vector control (Pr.800="2")
 Vector control (Pr.800="4"), PM sensorless vector control (Pr.800="14")
 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) page 430
Pr.450 Second applied motor page 438
Pr.804 Torque command source selection page 216
Pr.807 Speed limit selection page 219
Pr.810 Torque limit input method selection page 185
Pr.858 Terminal 4 function assignment, Pr.868 Terminal 1 function assignment page 410
Pr.868
setting
Speed control/torque control
switchover

Speed control/position control
switchover

Position control/torque control
switchover

Speed control
(MC signal-OFF)
Torque control
(MC signal-ON)
Speed control
(MC signal-OFF)
Position control
(MC signal-ON)
Position control
(MC signal-OFF)
Torque control
(MC signal-ON)
0
(initial value)
Speed setting
assistance
Speed limit
assistance
Speed setting
assistance

Speed setting
assistance
1
Magnetic flux
command

Magnetic flux
command

Magnetic flux
command

Magnetic flux
command

Magnetic flux
command
Magnetic flux
command
2
Regenerative
torque limit
(Pr.810=1)

Regenerative
torque limit
(Pr.810=1)
Regenerative
torque limit
(Pr.810=1)
Regenerative
torque limit
(Pr.810=1)

3 
Torque command
(Pr.804=0)

Torque command
(Pr.804=0)
4
Torque limit
(Pr.810=1)
Torque command
(Pr.804=0)
Torque limit
(Pr.810=1)
Torque limit
(Pr.810=1)
Torque li m i t
(Pr.810=1)
Torque command
(Pr.804=0)
5 
Forward/reverse
rotation speed limit
(Pr.807=2)

Forward/reverse
rotation speed limit
(Pr.807=2)
6 Torque bias
 
9999 
Pr.858
setting
Speed control/torque control
switchover

Speed control/position control
switchover

Position control/torque control
switchover

Speed control
(MC signal-OFF)
Torque control
(MC signal-ON)
Speed control
(MC signal-OFF)
Position control
(MC signal-ON)
Position control
(MC signal-OFF)
Torque control
(MC signal-ON)
0
(initial value)
Speed command
(AU signal-ON)
Speed limit
(AU signal-ON)
Speed command
(AU signal-ON)

Speed limit
(AU signal-ON)
1
Magnetic flux
command

Magnetic flux
command

Magnetic flux
command

Magnetic flux
command

Magnetic flux
command

Magnetic flux
command

4
Torque limit
(Pr.810=1)


Torque limit
(Pr.810=1)

Torque limit
(Pr.810=1)

Torque li m i t
(Pr.810=1)


9999 