Mitsubishi Electric 800 Series, Инструкция по эксплуатации, Страница: 162 / 727

Speed control under Real sensorless vector control, vector control, PM sensorless vector
control
PARAMETERS
161
5
 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".

For the details of the increments of speed setting and running speed monitoring, refer to page 345 .
NOTE
• The internal resolution of the torque limit is 0.024% (100/2
12
), and fractions below this resolution are rounded off.
• 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 page 345 .

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 page
595 ).

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.811
setting
Increments of speed setting and running
speed monitoring

Torque limit setting increments
0 1 r/min
0.1%
1 0.1 r/min
10 1 r/min
0.01%
11 0.1 r/min
Pr.803 setting
Torque characteristic in low-
speed range
Torque characteristic in constant-power range
Torque characteristic Output limit
0 (initial value)
The torque changes according to
the scaling factor set in
Pr.86 .

Constant motor output —
1 Constant torque Constant torque Without
2 Constant torque Constant torque With
10 Constant torque Constant motor output —
11
The torque changes according to
the scaling factor set in
Pr.86 .

Constant torque Without
Pr.801 setting Description
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.85
Pr.803 =0
Torque
Low-speed
range
Constant torque
range
Constant power range
Constant power limit
Torque rise limit
Rated speed Speed
Pr.803 =1
Constant torque limit
Constant torque limit
Pr.85
Rated speed Speed
Torque
Low-speed
range
Constant torque
range
Constant power range