Mitsubishi Electric FR-D720-008 Instruction Manual page 156

Frequency setting by analog input (terminal 2, 4)
60Hz
Bias
C2(Pr. 902)
0
0
Frequency setting signal
0
C3(Pr. 902)
60Hz
Bias
C5(Pr. 904)
0 20
0 4
C6(Pr. 904)
NOTE
When voltage/current input signal for terminal 4 was switched using Pr. 267 and voltage/current input switch, perform
calibration without fail.
(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, Pr. 267, and voltage/current switch, the display units of C3 (Pr.
902), C4 (Pr. 903), C6 (Pr. 904), C7 (Pr. 905) change as shown below.
Analog Command (terminal 2, 4)
(depending on Pr. 73, Pr. 267,
and voltage/current input
switch)
0 to 5V input
0 to 10V input
0 to 20mA input
152
Initial value
100%
5V
10V
C4(Pr. 903)
Initial value
100%
Frequency setting
20mA
signal
C7(Pr. 905)
Pr. 241 = 0 (initial value)
0 to 5V 0 to 100% (0.1%) display
0 to 10V 0 to 100% (0.1%) display
0 to 20mA 0 to 100%(0.1%) display
(1) Change
analog input (Pr. 125, Pr. 126)
Set Pr. 125 (Pr. 126) when changing frequency
setting (gain) of the maximum analog input voltage
(current) only. (C2 (Pr. 902) to C7 (Pr.905) setting
need not be changed)
Gain
Pr. 125
(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 5VDC, 0 to 10VDC or 4 to 20mADC, and
the output frequency.
Set the bias frequency of the terminal 2 input using
C2 (Pr. 902).
(It is initially set to the frequency at 0V)
Set the output frequency in Pr. 125 for the frequency
command voltage set with Pr. 73 Analog input
selection.
Set the bias frequency of the terminal 4 input using C5
(Pr. 904).
(It is initially set to the frequency at 4mA)
Using Pr. 126, set the output frequency relative to
20mA of the frequency command current (4 to
Gain
Pr. 126
20mA).
There are three methods to adjust the frequency
setting voltage (current) bias/gain.
a) Method to adjust any point by application of a
voltage (current) across terminals 2-5 (4-5)
page 153
b) Method to adjust any point without application of
a voltage (current) across terminals 2-5 (4-5)
page 154
c) Method to adjust frequency only without
adjustment of voltage (current)
0 to 100%
0 to 100%
0 to 100%
the frequency at
Pr. 241 = 1
0 to 5V (0.01V) display
0 to 10V (0.01V) display
0 to 20mA (0.01mA) display
maximum
page 155