Mitsumi electronic 55K Meter frequency meter calibration Pr , Pr, Calibration of terminal FM

PARAMETERS

4.2.55 Meter (frequency meter) calibration (Pr. 900, Pr. 901)

Pr. 900 "FM terminal calibration"

Pr. 901 "AM terminal calibration"

Related parameters

Pr. 54 "FM terminal function selection" Pr. 55 "frequency monitoring reference" Pr. 56 "current monitoring reference" Pr. 158 "AM terminal function selection"

#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 pulses/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.

Meter

1mA full scale Analog meter

1mA
(AM) FM	(	)	(	)
* Calibration
resistor
(5) SD

T1

8VDC

T2

1440 pulses/s ()

(AM) FM

(5) SD

(Digital meter)

( )

Pulse width T1 :Adjusted with Pr. 900

Pulse period T2 :Set in Pr. 55 (frequency monitoring) Set in Pr. 56 (current monitoring)

Note: The parameter is factory-set to 1mA full-scale or 1440 pulses/s FM output frequency at 60Hz.

*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 4

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, 6, 8, 10 to 14, 17 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 pulses/s.

At this 1440 pulses/s, 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, 6, 8, 10 to 14, 17 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.

155