Mitsubishi Electric FR-F740 EC Instruction Manual page 299

Parameter
Calibration of the zero point of the meter connected to terminal CA is performed with C9
(Pr. 930). Calibration of the maximum meter deflection is performed with C11 (Pr. 931).
The value to be associated with the zero point for the signal output to terminal CA is entered in
C8 (Pr. 930). The value for the signal to be associated with the maximum analog output value
(maximum deflection) is entered in C10 (Pr. 931). You can also set these parameters to use the
analog meter for only a defined sub-range of the full scale of the monitor signal to be output. For
example, if you only want to show the value of the output voltage between 100 and 400V (i.e.
output 4mA for all voltages between 0 and 100V and 20mA for all voltages above 400V) then set
C8 to 12.5% (100V is 12.5% of the maximum inverter output voltage of 800V) and C9 to 20%
(corresponds to approx. 20 mA at the CA terminal).
Fig. 6-84:
CA terminal calibration procedure:
Connect an 0-20mA DC meter (DC ammeter) to inverter terminals CA and 5, taking care to
correct with the correct polarity. CA is positive.
Set Pr. 54 to select the monitor signal you want to output to analog output CA. To display
the output frequency or the output current set Pr. 55 or Pr. 56, respectively, to the maximum
frequency or current value at which you wish to output 20mA to the terminal.
Zero point calibration: The zero point of the meter is calibrated with C9 (Pr. 930). The
calibration display is shown in percent. A value of 0% corresponds to approx. 0mA, a value
of 20% to approx. 4mA. The value for the monitor signal up to which the minimum analog
current is to be output is set with C8 (Pr. 930). Here too, the calibration display is in percent,
and 100% corresponds to the full scale value of the monitor signal selected (refer to Tab.
6-23).
Start the frequency inverter in PU mode with the operation panel or the control terminals
(external operation).
Calibrate the full deflection of the meter by selecting C0 (Pr. 900) and then operating the
digital dial. Note that the value shown on the operating panel for the monitor signal
associated with C0 does not change when you turn the digital dial! However, the analog
current output to CA will change as you turn the dial. Confirm the calibration value found by
pressing the SET key (this assigns the maximum analog current output to the displayed
value of the monitor signal.)
FR-F700 EC
Analog output current (CA)
C0 (Pr. 900) 20 mA
100%
Analog current output value for
zero output signal
(C9 (Pr. 930))
CA terminal calibration
Monitor display and monitor output signals
Output signal value for minimum
analog output
(C10 (Pr. 931))
Analog current output value for
maximum output signal
(C11 (Pr. 931))
Output signal value
Output signal value for zero
analog current output
(C8 (Pr. 930))
I001167E
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