Mitsubishi Electric FR-A700 Series, Technical Manual

Page: 288 / 550

322
PARAMETER
(2) Change the torque at maximum analog
input [C18(Pr. 920), C36(Pr. 929), C40(Pr.
933)]
Set [ C18 (Pr. 920) ], [ C36 (Pr. 929) ], [ C40 (Pr. 933) ] when
changing only torque setting (gain) of the maximum
analog input voltage (current).
(3) Analog input bias/gain calibration
[C16 to C19(Pr. 919, 920), C34 to C37(Pr.
928, 929), C38 to C41(Pr. 932, 933)]
The "bias" and "gain" functions are used to adjust the
relationship between the input signal entered from
outside the inverter to set the torque command and
torque limit, e.g. 0 to 5VDC, 0 to 10VDC or 4 to
20mADC, and the torque.
Set the bias torque of the terminal 1 input using [
C16
(Pr. 919) ] . (It is initial value to the torque at 0V)
Set the torque in [ C18 (Pr. 920) ] for the torque
command voltage set with [ Pr. 73 Analog input
selection ]. (Initial value is 10V)
Set the bias torque of the terminal 4 input using [ C38
(Pr. 932) ] . (It is initial value to the torque at 4mA)
Set the torque in [
C40 (Pr. 933)
] for 20mA of the
torque command current (4 to 20mA).
When the voltage/current input specifications were
changed using [
Pr. 73 and 267
], be sure to make
calibration.
Set [ C34 (Pr. 928) ] for the bias torque of terminal 6
(FR-A7AZ). (Initial value is 0)
Set [
C36 (Pr. 929) ] for the torque of torque command
at voltage 10V (Initial value).
(4) Analog input display unit switchover [
Pr. 241
]
You can change the analog input display unit (%/V/
mA) for analog input bias/gain calibration.
Depending on the terminal input specification set in
[
Pr. 73 ] and [ Pr. 267 ], the display units of [ C17 (Pr. 919) ]
[
C19(Pr. 920)
], [
C39(Pr. 932)
] and [
C41(Pr. 933)
] change
as shown below.
Calibration example of terminal 1
400
150
-150
0
0
Torque setting signal
100 %
10V
Bias
0 5V
(-5V)
-100 %
(-10V)
[ C18 (Pr.920) ]
Gain
[ C16 (Pr.919) ]
[ C17 (Pr.919) ] [ C19 (Pr.920) ]
T
orque(%)
Initial value
400
150
T
o
rque(%)
0
Torque setting signal
100%
Bias
0
20
4 20mA
[ C40 (Pr.933) ]
Gain
[ C38 (Pr.932) ]
[ C39 (Pr.932) ] [ C41 (Pr.933) ]
Initial value
Calibration example of terminal 4
Analog
Command
(Terminal 1,4)
[ Pr. 73, Pr. 267 ]
[ Pr. 241 = 0]
(Initial Value)
[
Pr. 241
= 1]
0 to 5V input
Displayed in 0 to
100%
(displayed in 0.1%)
Displayed in 0 to 5V
(0.01V increments)
0 to 10V input
Displayed in 0 to
100%
(displayed in 0.1%)
Displayed in 0 to 10V
(0.01V increments)
0 to 20mA input
Displayed in 0 to
100%
(displayed in 0.1%)
Displayed in 0 to 20mA
(0.01mA increments)
Torque(%)
Torque setting
signal
[ C36 (Pr. 929) ]
Gain
[ C37 (Pr.929) ]
Initial value
Calibration example of terminal 6 (torque command)
150%
150%
0
10V -10V
Torque limit value
is clamped at 0%
Torque(%)
Initial value
Bias
[
C34 (Pr.928) ]
[ C35
(Pr. 928) ]
Torque setting
signal
[ C36 (Pr. 929) ]
Gain
[ C37 (Pr.929) ]
Calibration example of terminal 6 ((regenerative) torque limit)
150%
0
10V
-10V
Bias
[
C34 (Pr.928) ]
[ C35
(Pr. 928) ]