Meter (Frequency Meter) Calibration (Pr. 900, Pr. 901) - Mitsubishi Electric FR-A520-2.2K Instruction Manual

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Meter (frequency meter) 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
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scale.
Terminal FM provides the pulse output. By setting Pr. 900, you can calibrate the meter connected to the
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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 1440Hz
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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.
Meter
1mA full scale
Analog meter
T1
(–)
DC8V
T2
Pulse width T1 :Adjusted with Pr. 900
Pulse period T2 :Set in Pr. 55 (valid for frequency monitoring only)
Terminal AM is factory-set to provide a 10VDC output in the full-scale state of each monitored data. Pr. 901
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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 1440Hz.
At this 1440Hz, the meter normally deflects to full scale.
(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.
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Pr. 54 "FM terminal function selection"
Pr. 55 "frequency monitoring reference"
Pr. 56 "current monitoring reference"
Pr. 158 "AM terminal function selection"
(Digital meter)
(–)
1mA
FM (AM)
(+)
SD (5)
Note: The parameter is factory-set to 1mA full-scale or 1440Hz FM
output frequency at 60Hz.
169
PARAMETERS
Related parameters
(+) 1440Hz
FM (AM)
SD (5)