Speed control under Real sensorless vector control, vector control, PM sensorless vector
Changing the setting increments of the torque limit level (Pr.811)
• The setting increments of Pr.22 Torque limit level, Pr.801 Output limit level, and Pr.812 to Pr.817 Torque limit level can
be changed to 0.01% by setting Pr.811 Set resolution switchover = "10 or 11".
Pr.811
Increments of speed setting and running
setting
0
1 r/min
1
0.1 r/min
10
1 r/min
11
0.1 r/min
For the details of the increments of speed setting and running speed monitoring, refer to
NOTE
• The internal resolution of the torque limit is 0.024% (100/2
• When Real sensorless vector control is selected, fractions below a resolution equivalent to 0.1% are rounded off even if
Pr.811="10, 11" is set.
• For details on changing the speed setting increments, refer to
Changing the torque characteristic of the constant-power range (Pr.801,
Pr.803)
• Under Real sensorless vector control or Vector control, the torque characteristic can be changed between in the low-speed
range and in the constant power range.
• Use Pr.85 Excitation current refraction point to change the low-speed range, and use Pr.86 Excitation current low
speed multiplying factor to change the torque in the low-speed range. When Pr.85 = "9999 (initial value)", a
predetermined frequency is used. When Pr.86 = "9999 (initial value)", a predetermined scaling factor is used (refer to
595).
Torque characteristic in low-
Pr.803 setting
speed range
The torque changes according to
0 (initial value)
the scaling factor set in Pr.86.
1
Constant torque
2
Constant torque
10
Constant torque
The torque changes according to
11
the scaling factor set in Pr.86.
This is applicable only under Real sensorless vector control. The upper limit of the torque at 0 Hz is determined by multiplying the torque limit in
the constant-torque range by the scaling factor set in Pr.86.
• To avoid overload or overcurrent of the inverter or motor, use Pr.801 Output limit level to limit the torque current.
Pr.801 setting
0 to 400%
Set the torque current limit level.
9999
The torque limit setting value (Pr.22, Pr.812 to Pr.817, etc.) is used for limiting the torque current.
Pr.803=0
Torque
Low-speed
Constant torque
range
range
Torque rise limit
Rated speed
Pr.85
speed monitoring
Torque characteristic in constant-power range
Torque characteristic
Constant motor output
Constant torque
Constant torque
Constant motor output
Constant torque
Description
Constant power range
Constant power limit
Speed
Torque limit setting increments
0.1%
0.01%
page
345.
12
), and fractions below this resolution are rounded off.
page
345.
Output limit
—
Without
With
—
Without
Pr.803=1
Torque
Low-speed
Constant torque
range
range
Constant torque limit
Rated speed
Pr.85
control
page
Constant power range
Constant torque limit
Speed
161
PARAMETERS
5