Mitsubishi Electric FR-A820-04750-GF Instruction Manual page 114

2.3
Selection of the control method and the control mode
• Select a control method (and a control mode) from V/F control, Advanced magnetic flux vector control (speed
control), Real sensorless vector control (speed control, torque control), Vector control (speed control, torque
control, position control), and PM sensorless vector control (speed control, position control).
Settings
of Pr.80
Pr.71
(Pr.453)
(Pr.450)
and Pr.81
(Pr.454)
Induction motor
EM-A, MM-CF
Other than
9999
PM motor (other
than EM-A/MM-
CF)
PM motor
*3
—
9999
*1 The setting values of 100 and above are used when the fast-response operation is selected.
*2 For the EM-A or MM-CF motor, the setting other than "9, 13, 14, 109, 113, 114, or 9999" in Pr.800 (Pr.451) has the same meaning
as the setting "20 or 110" in Pr.800 (Pr.451) (speed control under PM sensorless vector control).
*3 V/F control is applied when Pr.80 or Pr.81 is "9999", regardless of the Pr.800 setting. When Pr.71 is set to the EM-A or MM-CF, PM
sensorless vector control is enabled even if Pr.80 ≠ "9999" or Pr.81 = "9999". (When other PM motors are used, set Pr.80 and Pr.81
according to the motor. Otherwise, proper operation cannot be performed.)
*4 Setting Pr.788 (Pr.747) = "0" (low-speed range torque characteristic disabled) selects speed control.
*5 The operation for the setting of "0 or 100" is performed when "1, 2, 6, 101, 102, or 106" is set.
*6 The operation for the setting of "4 or 104" is performed when "5 or 105" is set.
*7 Speed control under PM sensorless vector control is applied if an option for vector control for PM motor is not installed.
*8 The operation for the setting of "20 or 110" is performed when "10 to 14 or 111 to 114" is set.
2.4
Low-speed range torque characteristics selection
 When the low-speed range high-torque characteristic is enabled
(Pr.788 Low speed range torque characteristic selection = "9999
(initial value)")
• The high frequency superposition control provides enough torque in the low-speed range operation.
• The low-speed range high-torque characteristic is enabled for the EM-A and MM-CF motors.
 When the low-speed range high-torque characteristic is disabled
(Pr.788 Low speed range torque characteristic selection = "0")
• The current synchronization operation reduces much motor noise compared with the high frequency
superposition control.
• Since the torque in a low-speed range is low, use this setting for an operation with light start-up load.
NOTE
• Position control under PM sensorless vector control is not available when the current synchronization operation is
selected. Zero speed and servo lock are also disabled during current synchronization operation.
Pr.451
*1
Pr.800 setting
setting
For details on the settings, refer to the Instruction Manual (Detailed).
9, 109 —
13, 113
*2
14, 114
20 (initial value),
20, 110
110
*5
0, 100
3, 103
*6
4, 104
9, 109 —
20 (initial value),
20, 110
*8
110
9999 (initial
—
value)
—
Control method
*1
PM sensorless vector control test operation
Position control
Speed control /
PM sensorless position control
vector control
switchover
Speed control
Speed control
Position control
*7
Vector control
Speed control /
position control
switchover
PM sensorless vector control test operation
PM sensorless
*8
Speed control
vector control
The setting value of Pr.800 is used for the second motor.
(PM sensorless vector control (speed control) when Pr.800="9 or 109")
V/F control
7
Control mode
*4
—
MC signal ON: position control
MC signal OFF: speed control
*4
—
—
—
MC signal ON: position control
MC signal OFF: speed control
—
BCN-C22005-1008
Remarks