Output waveform of terminal FM

The output signal of terminal FM has a pulse waveform as shown in the table below and the number of its pulses is proportional to the inverter output frequency.

The output voltage (average voltage) is also proportional to the output frequency.

Terminal FM Output Voltage

 

 

Specifications

Inverter

 

Calibration parameter C1 (Pr. 900)

24V

Output

 

 

 

waveform

8V

 

 

 

 

Max. 2400 pulses/s

FM

Number

Set a full-scale value which

SD

of output

achieves 1440 pulses/s.

 

pulses

Pr. 55: frequency monitoring

FM

(pulses/

reference

 

second)

Pr. 56: current monitoring

Example of Inverter and Frequency

 

reference

Meter

Output

0 to 8VDC max. (*1)

 

voltage

(Approx. 5V at 1440 pulses/s)

 

*1. 0.5V or less when a DC ammeter of 300Ω

or less internal resistance is connected

to measure the output voltage.

 

Adjustment

Analog meter

To adjust the reading of an analog indicator (ammeter), turn the calibration resistor

to change the current.1 When using the operation panel or parameter unit for adjustment, change the pulse width of the output waveform (calibration parameter "C1") (adjust the current through the adjustment of the output voltage) to adjust the reading. (For details, refer to page 111.)

REMARKS

It is not recommended to use a voltage type indicator because it is easily affected by a voltage drop, induction noise, etc. and may not provide correct reading if the wiring distance is long.

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Mitsubishi FR - S500 instruction manual Output waveform of terminal FM
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