Mitsubishi Electric FR-A820-00046 Instruction Manual page 532

(M) Monitor display and monitor output signal
Terminal CA calibration (C0 (Pr. 900), C8 (Pr. 930) to C11 (Pr. 931))
● Terminal CA is initially set to provide a 20 mA DC output in the full-scale state of the corresponding
monitor item.
Calibration parameter C0 (Pr. 900) allows the output current ratio (gains) to be adjusted according
to the meter scale.Note that the maximum output current is 20 mA DC.
● Set a value at the minimum current output in the calibration parameters C8 (Pr. 930) and C9
(Pr. 930). Calibration parameter C10 (Pr. 931) and C11 (Pr. 931) are used to set a value at the
maximum current output.
● Set the output signal values (output monitor set with Pr. 54) at zero and at the maximum current
output from the terminal CA (using calibration parameters C8 (Pr. 930) and C10 (Pr. 931). The full
scale for each monitor is 100% at this time.
● Set the output current values (output monitor set with Pr. 54) at zero and at the maximum current
output from the terminal CA (using calibration parameters C9 (Pr. 930) and C11 (Pr. 931). The
output current calibrated by calibration parameter C0 (Pr. 900) is 100% at this time.
Fig. 5-159:
● Calibrate the terminal CA in the following procedure.
Connect a 0-20 mA DC indicator (frequency meter) across terminals CA and 5 of the inverter.
(Note the polarity.The terminal CA is positive.)
Set the initial value of calibration parameter C8 (Pr. 930) to C11 (Pr. 931). If the meter needle
does not indicate zero when the current input is at zero, calibrate the meter using C8 (Pr. 930)
and C9 (Pr. 930).
Refer to the monitor description list (page 5-342) and set Pr. 54.
When the running frequency or inverter output current is selected on the monitor, set the
running frequency or current value at which the output signal will be 20 mA, using Pr. 55 or
Pr. 56 beforehand.
If the meter needle does not point to maximum even at maximum output, calibrate it with C0
(Pr. 900).
NOTES When outputting such an item as the output current, which cannot reach a 100% value easily by
operation, set Pr. 54 to "21" (reference voltage output) and calibrate. 20 mA DC is output from the
terminal CA.
When Pr. 310 "Analog meter voltage output selection" = "21", the terminal FM calibration cannot
be performed. For the details of Pr. 310, refer to the Instruction Manual of FR-A8AY.
Output is possible from terminal CA even if C8 (Pr. 930) ≥ C10 (Pr. 931), C9 (Pr. 930) ≥ C11 (Pr. 931).
5 - 352
(ammeter)
0 to 20 mA DC
CA
(+)
5
Terminal CA calibration
Analog output current
(CA)
20 mA
(-)
C0 (Pr. 900)
100 %
Analog current output value for zero output signal
(C9 (Pr. 930))
Parameters
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))
I002617E, I001167E