147
Frequency setting by analog input (terminal 2, 4)
4.16.2 Response level of analog input and noise elimination (Pr. 74)
The above parameters can be set when
Pr. 160 Extended function display selection
= "0".
Valid for eliminating noise of 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. (The time constant can be set between approximately 1ms to 1s with the setting
of 0 to 8.)
(3) Perform operation by analog input selection.
When the pressure or temperature is controlled constant by a fan,
pump, etc., automatic operation can be performed by inputting the
output signal 4 to 20mADC of the adjuster to across the terminals 4-5.
The AU signal must be turned on to use the terminal 4.
Reversible operation example
(4) Perform forward/reverse rotation by analog input
(polarity reversible operation)
Setting "10" or "11" in
Pr. 73
and adjusting
Pr. 125
(
Pr. 126
)
Terminal 2
frequency setting gain frequency
(
Terminal 4 frequency setting gain
frequency
) and
C2 (Pr. 902)
Terminal 2 frequency setting bias frequency
to
C7 (Pr.905)
Terminal 4 frequency setting gain
makes reverse operation
by terminal 2 (terminal 4) valid.
Example)When performing reversible operation by terminal 2 (0 to 5V)
input
1) Set "11" in
Pr. 73
to make reversible operation valid.
Set frequency at maximum analog input in
Pr. 125 (Pr. 903)
2) Set 1/2 of the value set in
C4 (Pr. 903)
in
C3 (Pr. 902)
.
3) Reversible operation is performed when 0 to 2.5VDC is input and
forward rotation when 2.5 to 5VDC.
NOTE
When reversible operation is set, be aware of reverse rotation operation when analog input stops (only the start
signal is input).
When reversible operation is valid, reversible operation (0 to 4mA: reverse operation, 4mA to 20mA: forward
operation) is performed by terminal 4 in the initial setting.
Parameters referred to
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency
Pr. 561 PTC thermistor protection level
C2 (Pr. 902) Terminal 2 frequency setting bias frequency to C7 (Pr. 905) Terminal 4 frequency setting gain
The time constant of the primary delay filter can be set for the external frequency command (analog input (terminal 2, 4)
signal).
Parameter
Number
Name
Initial Value
Setting Range
Description
74
Input filter time constant
1
0 to 8
Primary delay filter time constant for the
analog input.
A larger setting results in a larger filter.
STF
Inverter
Forward rotation
Frequency setting
PC
4
5
AU
Connection diagram using terminal 4 (4 to 20mADC)
4 to 20mADC
Current input
equipment
2.5V
C3(Pr.902)
Pr. 125
C4(Pr.903)
C2(Pr. 902)
5V
Reverse
rotation
Forward
rotation
Set frequency (Hz)
Terminal 2
input (V)
0
Frequency setting signal
Not
reversible
Reversible
Содержание FR-D700 Series
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