Analog and Digital Monitor Output, + 1∝ F | Hitachi L100 specification

4–26

Analog and Digital Monitor Output

Current Monitor, PWM Signal – (C23 = 01) – The [FM] output duty cycle varies with the inverter output current to the motor. The signal period T is fixed at 4 ms, and the amplitude is fixed at 10 VDC. The signal on [FM] reaches full scale when the inverter output current reaches 200% of the rated inverter current. You can scale the duty cycle by a scale factor setting with parameter B81. The accuracy of the current reading is given by the equation:

Imc---------------------– Im ⋅ 100 ≤ ± 20%	Im = Inverter output current (measured)
	Imc = Monitor display current
Ir	Ir = Inverter rated current

NOTE: The monitor display accuracy (normally ± 20%, depending on the connected motor’s characteristics) can be improved by the adjustment of parameter B32. If precise current measurement is necessary, use the moving-coil type ammeter between the inverter and the motor.

TIP: When using the analog meter for monitoring, adjust the meter so it has a zero reading when the [FM] output is zero. Then use scale factor B81 to adjust the [FM] output so the maximum frequency in the inverter corresponds to a full-scale reading on the meter.

PWM Smoothing Circuit – You may need to smooth the PWM signal, converting it to a relatively stable DC analog voltage which represents the [FM] output value. To do this, use the circuit shown to the right. Note the output impedance of the circuit is at least 82k Ohms, so the monitoring device needs an input impedance of 1 Meg. Ohms or greater. Otherwise, the impedance of the smoothing circuit will cause a non-linearity in the reading.

H	O OI	L	FM CM2 12 11
		–	+
			82kΩ
			+
	33kΩ		+ 1∝ F	Volts
			–

See I/O specs on page 4–5.

Operations and Monitoring

Frequency Monitor, FM Signal – (C23 = 02) – The [FM] output frequency varies with the inverter output frequency. The maximum frequency of [FM] is 3.6 kHz, or 10 times the inverter maximum frequency. The signal on [FM] reaches the maximum frequency when the inverter outputs the maximum frequency. You can scale its relationship to the inverter output with the scale factor setting with parameter B86.

Frequency modulation (digital)

50% fixed duty cycle

[FM]	T	=	1
[FM]	T	=	------------------------------
			Output value
10V
0 V
	T		time
	T

C23 = 02 Inverter output frequency

B86 Freq. scale factor

L100 specifications

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Hitachi L100 instruction manual Analog and Digital Monitor Output, + 1∝ F

Models: L100

Analog and Digital Monitor Output

Imc---------------------– Im ⋅ 100 ≤ ± 20%

+ 1∝ F

Frequency modulation (digital)

L100 specifications