Mitsubishi Electric FR-A700 Series, Техническое руководство

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225
2
P
ARAM
ETE
R
PARAMETER
(8) Analog input filter and offset adjustment
[
Pr. 74, 849
]
You can adjust response level and stability of
frequency command and torque command at analog
input (terminal 1, 2, 4, terminal 6 ( when with
FR-A7AZ))
For , if the setting of [ Pr. 822, 826 ] ([ Pr. 832, 836 ] when
RT signal is ON) is not 9999, [ Pr. 74 ] setting is invalid.
(Refer to page 323)
1) Time constant of analog input [ Pr. 74 ]
Effective for eliminating noise in the frequency
setting circuit.
Increase the filter time constant if steady
operation cannot be performed due to noise. A
larger setting results in slower response. (Refer to
the following table for time constant.)
2) Offset adjustment of analog speed command
input [ Pr. 849 ]
When speed command by analog input is set,
create the range where the motor remains stop to
prevent malfunction at very low speed.
On the assumption that the [
Pr. 849 ] setting 100%
as 0, the offset voltage is offset as follows:
100% [
Pr. 849 ]......positive side
100% [ Pr. 849 ]......negative side
*According to the [ Pr. 73 ] setting
common
A700
A700
[ Pr. ] Name Initial Value Setting Range Description
Available
Inverters
74 Input filter time constant 1 0 to 8
Set the primary delay filter time constant
for the analog input. A larger setting
results in slower response.
849 Analog input offset adjustment 100% 0 to 200%
This function provides speed command
by analog input (terminal 2) with offset.
Motor rotation due to noise, etc. by analog
input can be avoided at zero speed
command.
—
A700
F700
E700
D700
[ Pr. 74 ]
Setting
Time Constant
0 Approx. 5ms
1 Approx. 10ms
2 Approx. 20ms
3 Approx. 40ms
4 Approx. 80ms
5 Approx. 160ms
6 Approx. 320ms
7 Approx. 640ms
8 Approx. 1280ms
common
A700
Offset voltage =
Voltage at 100%
(5V or 10V*)
100
[V]
100
=
Pr.849
]
0% 100%
(10V or 5V)
[ Pr.849 ] setting
Frequency
command
Speed setting
signal
Slope determined
according to [
Pr.125
and C2 to C4 ]
Slope does not
change.
200% 100% 0%