178
Frequency setting by analog input (terminal 1, 2, 4)
(3) Analog input display unit changing
(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 to
Pr. 73
and
Pr. 267
, the display units of
C3 (Pr. 902), C4 (Pr. 903),
C6 (Pr. 904) C7 (Pr. 905)
change as shown below.
(1) Change the frequency at maximum
analog input.
(Pr. 125, Pr. 126)
⋅
Set a value in
Pr. 125 (Pr. 126)
when changing only
the frequency setting (gain) of the maximum analog
input power (current). (
C2 (Pr. 902) to C7 (Pr. 905)
setting need not be changed)
(2) Analog input bias/gain calibration (
C2(Pr.
902) to C7(Pr. 905)
, )
⋅
The "bias" and "gain" functions are used to adjust the
relationship between the input signal entered from
outside the inverter to set the output frequency, e.g. 0
to 5V, 0 to 10V or 0 to 20mADC, and the output
frequency.
⋅
Set the bias frequency of the terminal 2 input using
C2 (Pr. 902)
. (initial set to the frequency at 0V)
⋅
Using
Pr. 125
, set the output frequency relative to the
frequency command voltage (current) set in
Pr. 73
Analog input selection
.
⋅
Set the bias frequency of the terminal 4 input using
C5 (Pr. 904)
. (initial set to the frequency at 4mA)
⋅
Using
Pr. 126
, set the output frequency relative to
20mA of the frequency command current (0 to
20mA).
⋅
There are three methods to adjust the frequency
setting voltage (current) bias/gain.
(a) Method to adjust any point by application of
voltage (current) to across the terminals 2 and 5
(4 and 5).
page 179
(b) Method to adjust any point without application of a
voltage (current) to across terminals 2 and 5 (4
and 5).
page 180
(c) Adjusting only the frequency without adjusting the
voltage (current).
page 181
CAUTION
⋅
When the terminal 2 is calibrated to change the inclination of the set frequency, the setting of the terminal 1 is also changed.
⋅
When a voltage is input to the terminal 1 to make calibration, (terminal 2 (4) analog value + terminal 1 analog value) is the analog
calibration value.
⋅
When the voltage/current input specifications were changed using
Pr. 73
and
Pr. 267
, be sure to make calibration.
Analog Command
(terminal 2, 4)
(according to
Pr. 73, Pr. 267
)
Pr. 241
= 0 (initial value)
Pr. 241
= 1
0 to 5V input
0 to 5V
→
displayed in 0 to 100%(0.1%).
0 to 100%
→
displayed in 0 to 5V(0.01V).
0 to 10V input
0 to 10V
→
displayed in 0 to 100%(0.1%).
0 to 100%
→
displayed in 0 to 10V(0.01V).
4 to 20mA input
0 to 20mA
→
displayed in 0 to 100%(0.1%).
0 to 100%
→
displayed in 0 to 20mA(0.01mA).
REMARKS
⋅
Analog input display is not displayed correctly if voltage is applied to terminal 1 when terminal 1 input specifications (0 to ±5V, 0
to ±10V) and main speed (terminal 2, terminal 4 input) specifications (0 to 5V, 0 to 10V, 0 to 20mA) differ. (For example, 5V
(100%) is analog displayed when 0V and 10V are applied to terminal 2 and terminal 1 respectively in the initial status.
⋅
Set "0" (initial value is 0% display) in
Pr. 241
to use.
Output frequency
(Hz)
Pr.125
0
0
Frequency setting signal
100%
10V
0
20mA
Initial value
Bias
Gain
0
5V
C2
(Pr. 902)
C3 (Pr. 902)
C4 (Pr. 903)
60Hz
Output frequency
(Hz)
Pr. 126
0
Frequency setting signal
100%
Initial value
Bias
Gain
0
20
4
20mA
0
5V
0
1
2
10V
C5
(Pr. 904)
C6 (Pr. 904)
C7 (Pr. 905)
60Hz
50Hz
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