Mitsubishi Electric 800 Series Instruction Manual page 162

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