(M) Monitor display and monitor output signal
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.
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Pulse width T1: Adjust using calibration parameter C0
Pulse cycle T2: Set with Pr. 55 (frequency monitor)
Set with Pr. 56 (current monitor)
Indicating the FM output
FM output circuit
8 V DC
1440 pulses/s (+)