Mitsubishi Electric FR-A720-0.4K Instruction Manual page 307

Frequency/torque setting by analog
input (terminal 1, 2, 4)
.
60Hz
Bias
C2 (Pr. 902)
C12 (Pr. 917)
0
0
Frequency setting signal
0
0
C3 (Pr. 902)
C13 (Pr. 917)
60Hz
Bias
C5
(Pr. 904)
0 20
Frequency setting signal
0 4
0 1
0 2
C6 (Pr. 904)
There are three methods to adjust the frequency setting voltage (current) bias/gain.
(a) Method to adjust any point by application of voltage (current) across the terminals 2 and 5 (4 and 5).
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(b) Method to adjust any point without application of a voltage (current) across terminals 2 and 5(4 and 5).
page 298
(c) Adjusting only the frequency without adjusting the voltage (current).
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 signal was changed using Pr. 73, Pr. 267 and voltage/current input switch, be sure to make
calibration.
(4) 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
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,
voltage/current input switch)
0 to 5V input
0 to 10V input
0 to 20mA input
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.
In this case, set "0" (initial value is 0% display) in Pr. 241 to use.
296
Initial value
Gain
Pr. 125
C14 (Pr. 918)
100%
5V
10V
20mA
C4 (Pr. 903)
C15 (Pr. 918)
Initial value
Gain
Pr. 126
100%
20mA
5V
10V
C7 (Pr. 905)
Pr. 241 = 0 (initial value)
0 to 5V → displayed in 0 to 100% (0.1%).
0 to 10V → displayed in 0 to 100% (0.1%).
0 to 20mA → displayed in 0 to 100% (0.1%).
(2) Change the frequency
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)
(3) Analog input bias/gain calibration (C2(Pr.
902) to C7(Pr. 905), C12(Pr. 917) to C15(Pr.
918))
⋅ 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 4 to 20mADC, and the output
frequency.
⋅ Set the bias frequency of the terminal 2 input using
C2 (Pr. 902). (Initial value is 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 1 input using
C12 (Pr. 917). (Initial value is the frequency at 0V.)
⋅ Set the gain frequency of the terminal 1 input using
C14 (Pr. 918). (Initial value is the frequency at 10V.)
⋅ Set the bias frequency of the terminal 4 input using
C5 (Pr. 904). (Initial value is the frequency at 4mA.)
⋅ Using Pr. 126, set the output frequency relative to
20mA of the frequency command current (4 to
20mA).
page 299
and voltage/current input switch
0 to 100% → displayed in 0 to 5V (0.01V).
0 to 100% → displayed in 0 to 10V (0.01V).
0 to 100% → displayed in 0 to 20mA (0.01mA).
at maximum
, the display units of
Pr. 241 = 1