Mitsubishi Electric FR-A800, Instruction Manual

Page: 526 / 1042

(M) Monitor display and monitor output signal Parameters
5 - 346
Terminal FM pulse train output (Pr. 291)
Two kinds of pulse trains can be output to the terminal FM.
●
When Pr. 291 "Pulse train I/O selection" = "0 (initial value) or 1", output is made from FM, with
maximum of 8 V DC and 2400 pulses/s.
The pulse width can be adjusted by using the operation panel or parameter unit and calibration
parameter C0 (Pr. 900) FM/CA terminal calibration.
●
Commands can be sent (such as inverter output frequency) by connecting a 1 mA full-scale DC
ammeter or a digital meter.
Not needed when the operation panel or parameter unit 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.
However, the frequency meter needle may not deflect to full-scale if the calibration resistor is
connected. In this case, calibrate additionally with the operation panel or parameter unit.
In the initial setting, 1 mA full-scale and 1440 pulses/s terminal FM are used at 60 Hz.
Fig. 5-154:
FM output circuit
I002611E
I002612E
Fig. 5-155: Indicating the FM output
2.2K
20K
3.3K
SD
FM
Inverter
24 V
T2
T1
(-)
FM
SD
(+)
FM
SD
(-)
Indicator
1mA full-scale
analog meter
Calibration
resistor
Pulse width T1: Adjust using calibration parameter C0
Pulse cycle T2: Set with Pr. 55 (frequency monitor)
Set with Pr. 56 (current monitor)
8 V DC
1 mA
1440 pulses/s (+)
(Digital indicator)