Mitsubishi Electric F700 Instruction Manual page 137

Frequency setting by analog input (terminal 1, 2, 4)
50Hz
Bias
C2
(Pr.902)
0
0
Frequency setting signal
0
C3
(Pr.902)
50Hz
Bias
C5
(Pr.904)
0 20
0 4
Frequency setting signal
C6 (Pr.904)
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.
(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.
Analog Command
(terminal 2, 4)
(according to Pr. 73, Pr. 267)
0 to 5V input
0 to 10V input
4 to 20mA input
130
Initial value
Gain
100%
5V
10V
C4
(Pr.903)
Initial value
Gain
100%
20mA
C7 (Pr.905)
Pr. 241 = 0 (initial value)
0 to 5V → 0 to 100%(0.1%) is
desplayed.
0 to 10V → 0 to 100%(0.1%) is
desplayed.
0 to 20mA → 0 to 100%(0.1%) is
desplayed.
(1) Change the frequency at maximum
analog input. (Pr. 125, Pr. 126)
⋅ Set a value to 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)
Pr.125
(2) Analog input
(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). (Factory-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). (Factory-set to the frequency at
4mA)
⋅ Using Pr. 126, set the output frequency relative to
Pr.126
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 2-5
(4-5).
(b) Method to adjust any point without application
of a voltage (current) to across terminals 2-
5(4-5).
(c) Adjusting only the frequency without adjusting
the bias voltage (current).
0 to 100% → 0 to 5V(0.01V) is
desplayed.
0 to 100% → 0 to 10V(0.01V) is
desplayed.
0 to 100% → 0 to 20mA(0.01mA) is
desplayed.
bias/gain calibration
page 131
page 132
page 133
Pr. 241 = 1