Mitsubishi Electric 800 Series Instruction Manual (Function page 135

• 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)
OFF
ON
OFF
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 4 (Pr.840 ="1 or 2", Pr.847,
Pr.848)
• Calculate the torque bias from the load input to terminal 4 as shown in the following diagram, and then apply the torque
bias.
• To set the torque bias amount with a voltage input to terminal 4, set Pr.858 Terminal 4 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 (C38 to C41).
Pr.840
setting
(Forward motor rotation)
Torque command
terminal 4 gain
C40(Pr. 933)
1
Torque command
terminal 4 bias
C38(Pr. 932)
(Reverse motor rotation)
Torque command
terminal 4 bias
C38(Pr. 932)
2
Torque command
terminal 4 gain
C40(Pr. 933)
*1 When the LX signal is ON, the torque bias amount when ascending is applied regardless of the motor rotation direction.
*2 In Pr.846, set the input voltage/current at a balanced load in %, considering the full-scale value of the voltage input via terminal 4 as 100%.
Pr.267 setting Terminal 4 input
0 4 to 20 mA
1 0 to 5 V
2 0 to 10 V
134
5. Speed Control
5.7 Torque bias
Torque bias selection 2
(X43)
OFF
OFF
ON
ON
When ascending
Bias amount
C39(Pr. 932)
Terminal 4
input
Voltage for max. load
C41(Pr. 933)
&&Input voltage for
the balanced load
Pr. 846
Bias amount
&&Input voltage for
the balanced load
Pr. 846
Voltage for max. load
C41(Pr. 933)
Terminal 4
input
C39(Pr. 932)
Input voltage/current for the balanced load (Pr.846 = "50")
20 mA × 50% = 10 mA
5 V × 50% = 2.5 V
10 V × 50% = 5 V
Torque bias amount
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%)
When descending
(Reverse motor rotation)
Bias amount
Fall-time
torque bias
terminal 4
gain
C39(Pr. 932)
Pr. 848
Fall-time
torque bias
&&Input voltage for
terminal 4
the balanced load
bias
Pr. 846
Pr. 847
(Forward motor rotation)
Bias amount
Fall-time
&&Input voltage for
torque bias
the balanced load
terminal 4
Pr. 846
bias
Pr. 847
Fall-time
torque bias
C39(Pr. 932)
terminal 4
gain
Pr. 848
Terminal 4
input
Voltage for max. load
C41(Pr. 933)
Voltage for max. load
C41(Pr. 933)
Terminal 4
input