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Monitor display and monitor output signal
4
PARAMETERS
4.16.4 Terminal FM, 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 the Calibration parameter C0 (Pr. 900), the meter connected to
the inverter 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 by a digital counter. The monitor
value is 1440 pulses/s output at the full-scale value of the table on the previous page (Pr. 54 FM terminal function
selection).
⋅ Calibrate the terminal FM in the following procedure.
1) Connect an indicator (frequency meter) across the terminals FM-SD of the inverter. (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 output signal list (page 253) and set Pr. 54. When you selected the running frequency or inverter
output current as the output signal, preset the running frequency or current value, at which the output signal will
be 1440 pulses/s, to Pr. 55 Frequency monitoring reference or Pr. 56 Current monitoring reference. 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 terminal AM to full scale
deflection.
Parameter
Number
Name Initial Value Setting Range Description
C0(900) FM terminal calibration ⎯⎯
Calibrate the scale of the meter
connected to terminal FM.
C1(901) AM terminal calibration ⎯⎯
Calibrate the scale of the analog meter
connected to terminal AM.
*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 Not needed when the operation panel (FR-DU07) or parameter unit (FR-PU04/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 inverter.
Note that the needle of the frequency meter may not deflect to full-scale when the calibration resistor is connected. In this case, use
this resistor and perform calibration of operation panel or parameter unit.
*2 The initial settings are 1mA full-scale and 1440 pulses/s terminal FM frequency at 60Hz.
REMARKS
⋅ When outputting such an item as the output current, which cannot reach a 100% value easily by operation, set Pr. 54 = "21"
(reference voltage output) and make calibration. 1440 pulses/s are output from the terminal FM.
⋅ The wiring length of the terminal FM should be 200m maximum.
CAUTION
⋅ The initial value of the calibration parameter C0 (Pr. 900) is set to 1mA full-scale and 1440 pulses/s FM output frequency at
60Hz. The maximum pulse train output of terminal FM is 2400 pulses/s.
⋅ When a frequency meter is connected across terminals FM-SD to monitor the running frequency, the FM terminal output is
filled to capacity at the initial setting if the maximum output frequency reaches or exceeds 100Hz. In this case, the
Pr. 55 setting
must be changed to the maximum frequency.
⋅ When Pr. 291 Pulse train I/O selection = "10, 11, 20, 21, 100" (high speed pulse train output), calibration using calibration
parameter C0 (Pr. 900) cannot be made.
8VDC
T2
T1
Pulse width T1: Adjust using calibration parameter C0
Pulse cycle T2: Set with Pr. 55 (frequency monitor)
Set with Pr.56 (current monitor)
(Digital indicator)
(-)
1440 pulses/s(+)
FM
SD
Indicator
1mA full-scale
analog meter
(+)
1mA
FM
SD
Calibration
resistor
*1
(-)