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Response Level Of Analog Input And Noise Elimination (pr. 74) - Mitsubishi Electric FR-F700PJ Instruction Manual

Air-conditioning inverter.
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Pr. 178 STF terminal function selection must be set to "60" (or Pr. 179 STR terminal function selection must be set to "61").
(All are initial values.)
The motor will not rotate ... Why?
Check that [EXT] is lit.
[EXT] is valid when Pr. 79 = "0" (initial value) or "2."
Check that wiring is correct. Check once again.
Change the frequency (0Hz) of the minimum value of potentiometer (at 0V initial value)
Adjust the frequency in calibration parameter C2 Terminal 2 frequency setting bias frequency. (Refer to page 188.)

4.17.3 Response level of analog input and noise elimination (Pr. 74)

The time constant of the primary delay filter can be set for the external frequency command (analog input (terminal 2, 4)
Input filter time constant
The above parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 197)
 Valid for eliminating noise of the frequency setting circuit.
 Increase the filter time constant if steady operation cannot be performed due to noise.
A larger setting results in slower response. (The time constant can be set between approximately 5ms to 1s with the setting
of 0 to 8.)
Frequency setting by analog input (terminal 2, 4)
to lit [EXT].
Initial Value
Setting Range
Primary delay filter time constant for the
0 to 8
analog input.
A larger setting results in a larger filter.


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