Mitsubishi Electric FR-A800 Series Instruction Manual page 508

• Set the bias frequency of the terminal 1 input using C12 (Pr.917). (It is initially set to the frequency at 0 V.)
• Set the gain frequency of the terminal 1 input using C14 (Pr.918). (It is initially set to the frequency at 10 V.)
• Set the bias frequency of the terminal 4 input using C5 (Pr.904). (It is initially set to the frequency at 4 mA.)
• Use Pr.126 to set the output frequency to the 20 mA input of the frequency command current (4 to 20 mA).
60Hz
(50Hz)
Bias
C2(Pr.902)
C12(Pr.917)
C3(Pr.902)
C13(Pr.917)
• There are three methods to adjust the bias/gain frequency setting voltage (current).
Adjustment by applying voltage (current) between terminals 2 and 5 (4 and 5) to set the voltage (current) at the bias/gain
frequency.
Adjustment by selecting the voltage (current) at the bias/gain frequency without applying voltage (current) between
terminals 2 and 5 (4 and 5).
Adjustment by changing the frequency without adjusting the voltage (current).
NOTE
• When the slope of the frequency is changed after calibration of terminal 2, the slope of the frequency is also changed for
terminal 1.
• When voltage is applied to terminal 1 while calibration of terminal 2 or terminal 4 is in progress, the terminal 1 input value is
added to the terminal 2 (4) input value.
• Always calibrate the input after changing the voltage/current input signal with Pr.73 (Pr.267) and the voltage/current input
selection switch.
 Display unit changing for analog input (Pr.241)
• The analog input display unit (%/V/mA) can be changed for analog input bias/gain calibration.
• Depending on the terminal input specification setting of Pr.73 (Pr.267) and the voltage/current input switch, the unit of the
displayed value of C3 (Pr.902), C4 (Pr.903), C6 (Pr.904) and C7 (Pr.905) changes as shown below:
Analog command (via terminal 2 or 4)
(depending on the settings of Pr.73
(Pr.267) and the voltage/current input
selection switch)
0 to 5 V input
0 to 10 V input
0 to 20 mA input
NOTE
• When voltage is applied to terminal 1 while the terminal 1 input specification (0 to ±5 V, 0 to ±10 V) does not agree with the
main speed (terminal 2 or terminal 4 input) specification (0 to 5 V, 0 to 10 V, 0 to 20 mA), the analog input is not correctly
displayed. (For example, when 0 V is applied to terminal 2 and 10 V is applied to terminal 1 in the initial status, the value is
indicated as 5 V (100%).)
Set "0 (initial value)" in Pr.241 to use the % display.
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Initial value
0
0
Frequency setting signal
0
0
page 508
page 508
0 to 100% (0.1%)
0 to 100% (0.1%)
0 to 100% (0.1%)
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60Hz
(50Hz)
Output frequency
(Hz)
Gain
Pr.125
C14(Pr.918) Bias
C5
(Pr.904)
100%
5V
10V
20mA
C4(Pr.903)
C15(Pr.918)
Pr.241 = "0 (initial value)"
Initial value
0 20
0 4
Frequency setting signal
0 1
0 2
C6(Pr.904)
page 510
Pr.241 = "1"
0 to 5 V (0.01 V)
0 to 10 V (0.01 V)
0 to 20 mA (0.01 mA)
5.12 (T) Multi-function input terminal parameters
1
2
3
Gain Pr.126
4
100%
20mA
5
5V
10V
C7(Pr.905)
6
7
8
9
10
507
5. PARAMETERS