Mitsubishi Electric FR-A700 Series Installation Manuallines page 33

7.6 Terminal CA, AM calibration (Calibration parameter C0 (Pr.
900), C1 (Pr. 901), C8 (Pr. 930) to C11 (Pr. 931))
By using the operation panel or parameter unit, you can calibrate terminal CA and terminal AM to full scale
deflection.
Parameter
Number
C0(900) CA terminal calibration
C1(901) AM terminal calibration
C8(930) Current output bias signal
C9(930) Current output bias current
C10(931) Current output gain signal
C11(931) Current output gain current
*1 The parameter number in parentheses is the one for use with the parameter unit (FR-PU04/FR-PU07).
*2 The above parameters allow its setting to be changed during operation in any operation mode even if "0" (initial value) is set in Pr. 77 Parameter
write selection.
(1) CA terminal calibration ( C0(Pr. 900), C8(Pr. 930) to C11(Pr. 931) )
0 to 20mADC
CA
5
Analog output current
(CA)
C0 (Pr. 900)
20mA
100%
0
Analog current output value for zero output signal
(C9 (Pr. 930))

Calibrate CA terminal in the following procedure.
1) Connect a 0-20mADC meter (DC ammeter) to across inverter terminals CA-5. (Note the polarity. Terminal CA is
plus.)
2) Set calibration parameters C8 (Pr. 930) to C11 (Pr. 931) to initial values. (When the meter needle does not point to
0, calibrate using C8 (Pr. 930) and C9 (Pr. 930))
3) Refer to the output signal list (page 28) to set Pr. 54.
When running frequency, inverter output current or the like has been selected as the output signal, preset in Pr.
55 or Pr. 56 the running frequency or current value at which the output signal is 20mA.
4) Run the inverter. (The inverter may be run in either the PU or External operation mode.)
5) Use calibration parameter C0 (Pr. 900) to set the meter needle to point to full-scale.
Remarks

When outputting the item that cannot achieve a 100% value easily by operation, e.g. output current, set "21" (reference voltage
output) in Pr. 54 and perform calibration. (20mADC is output at terminal CA.)

Even when calibration parameters are set as C8 (Pr. 930)
terminal CA.
Name Initial Value
(ammeter)
(+) (-)
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))
FR-A770 DEDICATED SPECIFICATIONS
Setting Range
 
 
0% 0 to 100%
0% 0 to 100%
100% 0 to 100%
100% 0 to 100%

Terminal CA is factory-set to provide a 20mADC output
in the full-scale status of the corresponding monitor item.
Calibration parameter C0 (Pr. 900) allows the output
current ratios (gains) to be adjusted according to the
meter scale. Note that the maximum output current is
20mADC.

Use calibration parameters C8 (Pr. 930) and C9 (Pr. 930)
to set a value for zero analog current output (meter
points zero) . In addition, use calibration parameters C10
(Pr. 931) and C11 (Pr. 931) to set a value for maximum
analog current output.

Use calibration parameters C8 (Pr. 930) and C10 (Pr. 931)
to set output signal values (monitor output set in Pr. 54 )
when the current output at terminal CA is zero or
maximum. At this time, the full-scale of each monitor is
100%. (Refer to the A700 Instruction Manual (Applied))

Use calibration parameters C9 (Pr. 930) and C11 (Pr. 931)
to set the current output values at terminal CA when the
output signal value (monitor output set in Pr. 54 ) is zero
or maximum. At this time, the current output calibrated
using calibration parameter C0 (Pr. 900) is 100%.

C10 (Pr. 931) and C9 (Pr. 930)
Description
Calibrate the scale of the meter
connected to terminal CA.
Calibrate the scale of the analog meter
connected to terminal AM.
Output signal value for minimum
analog current output
Output current value for minimum
analog current output
Output signal value for maximum
analog current output
Output current value for maximum
analog current output

C11 (Pr. 931), current can be output at
30