118
Description of parameters
3.4.28 Terminal FM and AM calibration (calibration parameter C0 (Pr. 900), C1 (Pr. 901))
(1) FM terminal calibration
(C0 (Pr. 900))
The terminal FM is preset to output pulses. By setting
calibration parameter C0 (Pr. 900
), the meter connected to the
converter can be calibrated by parameter setting without use of a calibration resistor.
Using the pulse train output of the terminal FM, a digital display can be provided to connect a digital counter. The monitor
value is 1440 pulses/s output at the full-scale value of monitor description list
(page 86) (Pr. 54 FM terminal function
selection)
.
Not needed when the operation panel (FR-DU07-CNV) or parameter unit (FR-PU07) is used for calibration.
Use a calibration resistor when the indicator (frequency meter) needs to be calibrated by a neighboring device because the indicator is located far from the
converter.
However, the frequency meter needle may not deflect to full-scale if the calibration resistor is connected. In this case, perform calibration using the operation
panel or parameter unit.
Calibrate the terminal FM in the following procedure.
1) Connect an indicator (frequency meter) across terminals FM and SD of the converter. (Note the polarity. The terminal
FM is positive.)
2) When a calibration resistor has already been connected, adjust the resistance to "0" or remove the resistor.
3) Refer to the monitor description list
and set
Pr. 54
.
When you selected a monitor that needs full-scale setting (
Pr. 54
= "1 to 3, 5, 7"), preset voltage or current that
outputs 1440 pulses/s signal using
Pr. 49, Pr. 51, Pr. 53, Pr. 55, and Pr. 56.
At 1440 pulses/s, the meter generally deflects to full-scale.
By using the operation panel or parameter unit, you can calibrate terminal FM and AM to full scale deflection.
Parameter
Number
Name
Initial Value
Setting Range
Description
C0(900)
FM terminal calibration
Calibrates the scale of the meter
connected to terminal FM.
C1(901)
AM terminal calibration
Calibrates the scale of the analog meter
connected to terminal AM.
The parameter number in parentheses is the one for use with the parameter unit (FR-PU07).
REMARKS
When outputting a signal such as input current, which cannot be adjusted to 100% easily by an operation, set
Pr. 54
= "21"
(reference voltage output) for the calibration. 1440 pulses/s are output from the terminal FM.
The wiring length of the terminal FM should be 200m at maximum.
NOTE
The initial value of the
calibration parameter C0 (Pr. 900)
is set to 1mA full-scale and 1440 pulses/s FM output frequency
when
Pr. 49, Pr. 51, Pr. 53, Pr. 55, and Pr. 56
are in initial settings. The maximum pulse train output of terminal FM is 2400
pulses/s.
8VDC
T2
T1
Pulse width T1: Adjust using calibration parameter C0
Pulse cycle T2: Set with
Pr. 49, Pr. 51, Pr. 53, Pr. 55, Pr. 56
(Digital indicator)
FM
SD
Indicator
1mA full-scale
analog meter
(+)
1mA
FM
SD
(-)
1440 pulses/s(+)
Calibration
resistor
∗
(-)
HC2.book 118 ページ ２０１２年１１月１９日 月曜日 午前１０時５２分
