Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 222

 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 follows:
• Functions of the terminal 1 under different control modes
Speed control/torque control
switchover
Pr.868
setting
Speed control
(MC signal-OFF)
0
Auxiliary speed
(initial
setting
value)
Magnetic flux
1
*4
command
Regenerative
2 driving torque limit
(Pr.810 = 1)
3 —
Torque limit
4
(Pr.810 = 1)
5 —
6 —
9999 —
• Terminal 4 functions by control
Speed control/torque control
switchover
Pr.858
setting
Speed control
(MC signal-OFF)
0
Speed command
(initial
(AU signal-ON)
value)
Magnetic flux
1
*4*5
command
Torque limit
4
*6
(Pr.810 = 1)
9999 —
— : No function
*1 Real sensorless vector control (Pr.800 = "12"), vector control (Pr.800 = "2")
*2 Vector control (Pr.800 = "4"), PM sensorless vector control (Pr.800="14")
*3 Vector control (Pr.800 = "5")
*4 This function is valid under vector control.
*5 Invalid when Pr.868 = "1".
*6 Invalid when Pr.868 = "4".
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 given.
• 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
Pr.450 Second applied motorpage 505
Pr.804 Torque command source selectionpage 270
Pr.807 Speed limit selectionpage 274
Speed control/position control
*1
Torque control Speed control
(MC signal-ON) (MC signal-OFF)
Speed limit Auxiliary speed
assistance setting
Magnetic flux Magnetic flux
*4 *4
command command
Regenerative
— driving 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
— —
Speed control/position control
*1
Torque control Speed control
(MC signal-ON) (MC signal-OFF)
Speed limit Speed command
(AU signal-ON) (AU signal-ON)
Magnetic flux Magnetic flux
*4*5 *4*5
command command
Torque limit
—
(Pr.810 = 1)
— —
selection)page 496
*2
switchover
Position control
(MC signal-ON)
— —
Magnetic flux
Magnetic flux
*4
command
command
Regenerative Regenerative
driving torque limit driving torque limit
(Pr.810 = 1) (Pr.810 = 1)
— —
Torque limit Torque limit
(Pr.810 = 1) (Pr.810 = 1)
— —
— —
— —
*2
switchover
Position control
(MC signal-ON)
— —
Magnetic flux Magnetic flux
*4*5
command command
Torque limit Torque limit
*6 *6
(Pr.810 = 1) (Pr.810 = 1)
— —
page 217and set Pr.800 or
Position control/torque control
*3
switchover
Position control Torque control
(MC signal-OFF) (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)
—
—
Position control/torque control
*3
switchover
Position control Torque control
(MC signal-OFF) (MC signal-ON)
Speed limit
(AU signal-ON)
Magnetic flux
*5 *5
command
—
*6
—
5. PARAMETERS
5.2 Control method
1
2
3
4
5
6
7
8
9
10
*4
221