Mitsubishi Electric FR-A700 Technical Manual page 191

(8) Analog input filter and offset adjustment
[Pr. 74, 849]
common
You can adjust response level and stability of
frequency command and torque command at analog
input (terminal 1, 2, 4, terminal 6 (
FR-A7AZ))
[Pr. ] Name
74 Input filter time constant
849 Analog input offset adjustment
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.)
[Pr. 74]
Setting
0
1
2
3
4
5
6
7
8
when with
A700
Initial Value Setting Range
1 0 to 8
100% 0 to 200%
common
Time Constant
Approx. 5ms
Approx. 10ms
Approx. 20ms
Approx. 40ms
Approx. 80ms
Approx. 160ms
Approx. 320ms
Approx. 640ms
Approx. 1280ms
For , if the setting of [Pr. 822, 826] ([Pr. 832, 836] when
A700
RT signal is ON) is not 9999, [Pr. 74] setting is invalid.
(Refer to page 323)
Description
Set the primary delay filter time constant
for the analog input. A larger setting
results in slower response.
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.
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
Voltage at 100%
Offset voltage =
*According to the [Pr. 73] setting
0%
0% 100%
225
PARAMETER
Available
Inverters
A700
A700
Pr.849]
100
100
(5V or 10V*)
Slope determined
according to [Pr.125
and C2 to C4]
Slope does not
change.
100% Speed setting
signal
(10V or 5V)
200% [Pr.849] setting
F700
E700
D700
—
2
[V]