Mitsubishi Electric 800 Series Instruction Manual page 177

Speed control under Real sensorless vector control, vector control, PM sensorless vector
control
Setting the torque bias amount using contact input (Pr.840="0", Pr.841 to
Pr.843)
• Select the torque bias amount shown in the table below using the corresponding contact signal combination.
• To input the X42 signal, set "42" in any of Pr.178 to Pr.189 (Input terminal function selection) to assign the function to a
terminal, and to input the X43 signal, set "43".
Torque bias
selection 1 (X42) selection 2 (X43)
OFF OFF
ON OFF
OFF ON
ON ON
• When Pr.841=1025, the torque bias is 25%. When Pr.842=975, the torque bias is -25%. When Pr.843=925, the torque bias
is -75%.
NOTE
• 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.
Setting the torque bias amount using terminal 1 (Pr.840 ="1, 2", Pr.847,
Pr.848)
• Calculate the torque bias from the load input to terminal 1 as shown in the diagram below, and then apply the torque bias.
• To set the torque bias amount with a voltage input to terminal 1, set Pr.868 Terminal 1 function assignment ="6".
• The torque bias amount (Pr.847) and gain amount (Pr.848) when descending (reverse motor rotation when the Pr.840
setting is "1", forward motor rotation when the setting is "2") can be set in a range of 0 to 400%. When Pr.847 or Pr.848
="9999", the setting is the same for both descending and ascending (Pr.919, Pr.920).
Pr.840
When ascending
Setting
(Forward motor rotation)
Bias amount
Torque command
terminal 1 gain
Pr. 920
1
Torque command
terminal 1 bias
Pr. 919
(Reverse motor rotation)
Bias amount
Torque command
terminal 1 bias
Pr. 919
2
Torque command
terminal 1 gain
Pr. 920
NOTE
• Input 0 to 10 V (torque command) to the terminal 1 that is used for the torque bias function. Any negative input voltage is
regarded as 0 V.
176
PARAMETERS
Torque bias
0%
Pr.841 -400% to +400% (Setting value: 600 to 1400%)
Pr.842 -400% to +400% (Setting value: 600 to 1400%)
Pr.843 -400% to +400% (Setting value: 600 to 1400%)
Pr. 919
Terminal 1
input
Voltage for
max. load
Voltage for Pr. 920
balanced load
Pr. 846
Voltage for
balanced load
Pr. 846
Voltage for
max. load
Pr. 920
Terminal 1
input
Pr. 919
Torque bias amount
When descending
(Reverse motor rotation)
Bias amount
Fall-time
torque bias
terminal 1
bias
Pr. 919
Pr. 848
Voltage for
Fall-time
max. load
torque bias
Voltage for Pr. 920
terminal 1
balanced load
gain
Pr. 846
Pr. 847
(Forward motor rotation)
Bias amount
Fall-time
Voltage for
torque bias
balanced load
terminal 1
Pr. 846 Voltage for
bias
max. load
Pr. 847
Pr. 920
Fall-time
torque bias
Pr. 919
terminal 1
gain
Pr. 848
Terminal 1
input
Terminal 1
input