Mitsubishi Electric FR-A700 Series, Technical Manual

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291
2
P
ARAM
ETE
R
PARAMETER
2.9.5 Torque bias [Pr. 840 to 848]
(A700)
This function accelerates the rise of the torque at a start. Adjust the torque at a motor start using the contact signals or analog
signals. Valid only during vector control.
(1) Block diagram
(2) Torque bias amount setting by contact input
(X42, X43 signal) [ Pr. 840 = 0, Pr. 841 to 843 ]
Select the torque bias amount in the table below
according to the combination of contact signals.
Set 42 in [
Pr. 178 to 189 Input terminal function
selection ] for the terminal used for X42 signal input
and set 43 for the terminal used for X43 signal input
to assign functions.
The setting 1000 of [ Pr. 841 to 843 ] is the torque bias
amount 0%.
Namely, on the assumption that the setting 1000 is
the center value, (setting-1000) is the torque bias
amount.
Therefore, setting 600 to 1400 corresponds to -400%
to +400% torque bias amount.
A700
[
Pr.
] Name Initial Value Setting Range Description
840
Torque bias selection
9999
0
Set the contact signal (X42, X43) based-torque bias amount
using [
Pr. 841 to 843
].
1
Set the terminal 1-based torque bias amount as desired in [
C16 to
C19
]. * (in the case a cage goes up when a motor runs reversely)
2
Set the terminal 1-based torque bias amount as desired in [
C16 to
C19
]. * (in the case a cage goes up when a motor runs forward)
3
The terminal 1-based torque bias amount can be set
automatically in [
C16 to C19, Pr. 846
] according to the load. *
9999 Without torque bias, rated torque 100%
841
Torque bias 1
9999
600 to 999%
Negative torque bias amount (
-
400% to
-
1%)
842
Torque bias 2
1000 to 1400% Positive torque bias amount (0% to 400%)
843
Torque bias 3
9999 Without torque bias setting
844
Torque bias filter
9999
0 to 5s Time until torque rises.
9999 Same operation as when 0s is set.
845
Torque bias operation time
9999
0 to 5s Time for maintaining torque equivalent to the torque bias amount.
9999 Same operation as when 0s is set.
846
Torque bias balance
compensation
9999
0 to 10V Set the voltage under balanced load.
9999 Same operation as when 0V is set.
847
Fall-time torque bias
terminal 1 bias
9999
0 to 400% Set the bias value of the torque command.
9999 Same as at a rise time [ C16, C17 (Pr. 919) ].
848
Fall-time torque bias
terminal 1 gain
9999
0 to 400% Set the gain value of the torque command.
9999 Same as at a rise time [ C18, C19 (Pr. 919) ].
* When FR-A7AZ is installed, torque bias amount setting from terminal 6 is also available.
Internal parameters
[ Pr. 840 = 0 ]
IM
CW
-
-
+
X42
X43
SD
+
+
+
0
Integration cleared to 0
+
+
Speed command
Torque bias selection 1
Torque bias selection 2
Speed command
[ Pr. 841 ]
[ Pr. 842 ]
[ Pr. 843 ]
Speed
control
P gain Speed
control
integral time
Torque
control
[ Pr. 840 = 1, 2, 3]
C16, C17
[ Pr. 919 ]
C18, C19
[ Pr. 920 ]
[ Pr. 846 ]
[ Pr. 845 ]
[ Pr. 826 ]
Torque setting filter 1
Terminal 1 or
Encoder
Cage
Load
detector
CW Cage
CW > Cage
Terminal 6
(FR-A7AZ)
X42 Signal X43 Signal Torque Bias Amount
OFF OFF 0
ON OFF [
Pr. 841
]
OFF ON [ Pr. 842 ]
ON ON [ Pr. 843 ]
[Example] When [ Pr. 841 = 1025 ] ... 25%
When [ Pr. 842 = 975 ] ... -25%
When [
Pr. 843 = 925
] ... -75%