Mitsubishi Electric FR-F740 EC Instruction Manual page 350

Frequency setting by analog input (terminals 1, 2 and 4)
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.)
Analog input bias/gain calibration [C2 (Pr. 902) to C7 (Pr. 905)]
The parameters for input bias and gain can be used to configure the inverter for set point signals
that do not exactly match 5Vor 10V or 20mA. You can enter the exact output frequencies to be
associated with the minimum and maximum signal values separately for terminals 2 and 4. This
feature can also be used to configure an inverse control characteristic (i.e. high output frequency
at minimum set point signal, minimum output frequency at maximum set point signal).
Set the bias frequency of the terminal 2 input using C2 (Pr. 902). (Factory-set to the frequency
at 0V.)
Parameter C3 (Pr. 902) is the frequency setting bias for the input signal at terminal 2, i.e. the min-
imum value of the analog signal. When signals are smaller than this value the frequency set
point signal will be limited to the value set with C2.
Parameter 125 sets the gain for the terminal 2 output frequency. This is the frequency set point
value that corresponds to the maximum analog signal defined with Pr. 73. (Pr. 125 is set to a de-
fault value of 50Hz at the factory.)
Parameter C4 (Pr. 903) sets the gain for the input signal on terminal 2, i.e. the maximum value
of the analog signal connected to terminal 2. When signals exceed this value the frequency set
point value is limited to the value stored in Pr. 125.
Parameter C5 (Pr. 904) sets the frequency set point bias frequency for terminal 4. This is the fre-
quency corresponding to the minimum analog signal. (This parameter is set to a default value
of 0Hz at the factory.)
Parameter C6 (Pr. 904) sets the bias of the input signal on terminal 4, i.e. the minimum value of
the analog signal connected to terminal 4. When the signal on this terminal is lower than this val-
ue the frequency set point value is limited to the value set with C5. (This parameter is set to a
default value of 20% at the factory, which corresponds to approx. 4mA.)
Parameter 126 sets the gain for the terminal 4 output frequency. This is the frequency set point
value that corresponds to the maximum analog signal defined with Pr. 73. (Pr. 126 is set to a de-
fault value of 50Hz at the factory.)
Parameter C7 (Pr. 905) sets the gain of the input signal on terminal 4, i.e. the maximum value
of the analog signal connected to terminal 4. When the signal on this terminal is higher than this
value the frequency set point value is limited to the value set with Pr. 126.
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Parameter