Fm / Am Terminal Calibration (Pr. 900, Pr. 901) - Mitsubishi Electric FR-A520-0.4K Instruction Manual

4.2.66 FM / AM terminal calibration (Pr. 900, Pr. 901)

Pr. 900 "FM terminal calibration"
Pr. 901 "AM terminal calibration"
By using the operation panel/parameter unit, you can calibrate a meter connected to terminal FM to full
scale.
Terminal FM provides the pulse output. By setting Pr. 900, you can calibrate the meter connected to the
inverter from the parameter unit without providing a calibration resistor.
You can display a digital value on a digital counter using the pulse train signal from terminal FM. A 1440
pulse/s output is provided at the full scale value as explained in the section of Pr. 54. When the running
frequency has been selected for monitoring, the ratio of this FM terminal output frequency can be set in Pr.
55.
1mA
FM
(+)
*Calibration
resistor
SD
Pulse width T1
Pulse period T2
* Not needed when the operation panel (FR-DU04) or parameter unit (FR-PU04) is used for calibration. Used
when calibration must be made near the frequency meter for such a reason as a remote frequency meter.
However, the frequency meter needle may not deflect to full-scale if the calibration resistor is connected. In
this case, use this resistor and the operation panel or parameter unit together to make calibration.
Terminal AM is factory-set to provide a 10VDC output in the full-scale state of each monitored data. Pr. 901
allows the output voltage ratio (gain) to be adjusted according to the meter reading. Note that the maximum
output voltage is 10VDC.
(1) Calibration of terminal FM
1) Connect a meter (frequency meter) across inverter terminals FM-SD. (Note the polarity. FM is the
positive terminal.)
2) When a calibration resistor has already been connected, adjust the resistance to "0" or remove the
resistor.
3) Set any of "1 to 3, 5 to 14, 17, 18 and 21" in Pr. 54.
When the running frequency or inverter output current has been selected as the output signal, preset
in Pr. 55 or Pr. 56 the running frequency or current at which the output signal is 1440 pulse/s.
At this 1440 pulse/s, the meter normally deflects to full scale.
4) When outputting the item that cannot achieve a 100% value easily by operation, e.g. output current,
set "21" (reference output voltage) in Pr. 54 and perform the following operarion. After that, set "2"
(output current, for example) in Pr. 54.
(2) Calibration of terminal AM
1) Connect a 0-10VDC meter (frequency meter) across inverter terminals AM-5. (Note the polarity. AM is
the positive terminal.)
2) Set any of "1 to 3, 5 to 14, 17, 18 and 21" in Pr. 158.
When the running frequency or inverter output current has been selected as the output signal, preset
in Pr. 55 or Pr. 56 the running frequency or current at which the output signal is 10V.
3) When outputting a signal which cannot achieve a 100% value easily by operation, e.g. output current,
set "21" in Pr. 158 and perform the following operation. After that, set "2" (output current, for example)
in Pr. 158.
Meter
1mA full scale
Analog meter
T1
(-)
8VDC
T2
:Adjusted with Pr. 900
:Set in Pr. 55 (frequency monitoring)
Set in Pr. 56 (current monitoring)
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Related parameters
Pr. 54 "FM terminal function selection"
Pr. 55 "frequency monitoring reference"
Pr. 56 "current monitoring reference"
Pr. 158 "AM terminal function selection"
1440pulse/s
FM
SD
Note: The parameter is factory-set to 1mA full-scale or 1440pulse/s FM
output frequency at 60Hz.
187
PARAMETERS
(Digital meter)
(+) (-)
4