Bias And Gain Of Frequency Setting Current (Pr. 125, Pr. 241, C2(Pr. 902) To C4(Pr. 903)) - Mitsubishi Electric 800 Series Instruction Manual

3.5.2 Bias and gain of frequency setting current
(Pr. 125, Pr. 241, C2(Pr. 902) to C4(Pr. 903))
You can set the magnitude (slope) of the output frequency as desired in relation to the frequency setting signal (4 to 20mADC).
When using analog current input of the FR-A8AN, be sure to calibrate with Pr. 125, C2 to C4 before starting operation.
 Analog input bias/gain calibration (Pr.125, C2(Pr. 902) to C4(Pr. 903))
60Hz
Bias
C2(Pr.902)
0 20
0 4
C3(Pr.902)
Frequency setting signal
NOTE
• When the terminal 40 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 40 analog value + terminal 1 analog value) is
the analog calibration value.
• When the plug-in option used was remounted on another inverter, use Pr.125, C2 to C4 to calibrate again.
20
ANALOG CURRENT INPUT
Initial value
Gain
Pr.125
100%
20mA
C4(Pr.903)
• Set a value in Pr. 125 when changing only the frequency
setting (gain) of the maximum analog input current. (C2
(Pr. 902) to C4 (Pr. 903) setting need not be changed)
• 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. 4 to
20mADC, and the output frequency.
• Set the bias frequency of the terminal 40 input using C2
(Pr. 902). (initially set to the frequency at 0mA)
• Using Pr. 125, set the output frequency relative to the
frequency command current.