Mitsubishi Electric FR-A800, Instruction Manual

Page: 295 / 1042

Parameters Speed control under Real sensorless vector control, vector control, PM sensorless vector control
FR-A800 5 - 115
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 (C16 to C19).
Pr. 840
Setting
When ascending When descending
1
(Forward motor rotation)
I002523E
(Reverse motor rotation)
I002524E
2
(Reverse motor rotation)
I002525E
(Forward motor rotation)
I002526E
Tab. 5-42: Setting the torque bias amount using terminal 1
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.
Torque command
terminal 1 gain
C18 (Pr. 920)
Torque command
terminal 1 gain
C16 (Pr. 919)
Voltage for
balanced load
Pr. 846
C17 (Pr. 919)
Bias amount
Terminal 1
input
Voltage for
max. load
C19 (Pr. 920)
C17 (Pr. 919)
Bias amount
Fall-time
torque bias
terminal 1
gain
Pr. 847
Fall-time
torque bias
terminal 1
bias
Pr. 848
Voltage for
balanced load
Pr. 846
Voltage for
max. load
C19 (Pr. 920)
Terminal 1
input
Torque command
terminal 1 bias
C16 (Pr. 919)
Torque command
terminal 1 gain
C18 (Pr. 920)
C17 (Pr. 919)
Voltage for
balanced load
Pr. 846
Voltage for
max. load
C19 (Pr. 920)
Terminal 1
input
Bias amount
Bias amount
Fall-time
torque bias
terminal 1
bias
Pr. 847
Fall-time
torque bias
terminal 1
gain
Pr. 848
C17 (Pr. 919)
Voltage for
balanced load
Pr. 846
Voltage for
max. load
C19 (Pr. 920
Terminal 1
input