Mitsubishi Electric FR-A700 Technical Manual page 86

Inverter
24V
2.2K
3.3K
FM
8V
20K
SD
A700 F700
Inverter
24V
2.2K
4.7K
FM
8V
20K
SD
E700 D700
(1) 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 pulse is proportional to the inverter
output frequency.
The output voltage (average voltage) is also
proportional to the output frequency.
Output
8VDC
waveform
Max. 2400 pulse/s
Number of Set a full-scale value which achieves 1440
output pulse pulse/s.
(pulse/s) [Pr. 55]: frequency monitoring reference
[Pr. 56]: current monitoring reference
0 to 8VDC max
Output
(approx. 3.5V
voltage
setting))
*1 Output voltage is 0.5V or less when a DC ammeter
of 300Ω or less internal resistance is connected to
measure the output voltage.
*2 Output voltage is approximately 4.7V in
Maximum output current
8V 3.3 K 2.4 mA
R
FM
Maximum output current
8V 3.3 K 2.4 mA
R
FM
common
Specifications
[Pr.900]
1/1440Hz
.
*1
at 1440 pulse/s (in the initial
*2
E700 D700
(2) Calibration of terminal FM
Calibrate the terminal FM in the following procedure.
1) Connect an indicator (frequency meter) across
terminals FM-SD of the inverter. (Note the polarity.
The terminal FM is positive.)
2) When a calibration resistor has already been
connected, adjust the resistance to "0" or remove
the resistor.
3) Refer to the monitor description list (page 345)
and set [Pr. 54].
When you selected the running frequency or
inverter output current as monitor, preset the
running frequency or current value, at which the
output signal will be 1440 pulse/s, to [Pr. 55
Frequency monitoring reference] or [Pr. 56 Current
monitoring reference].
At 1440 pulse/s, the meter generally shows to full-
scale.
*1 When calibrating a monitor output which does not
easily point to 100% even with an actual load,
output current for example, set [Pr. 54 = 21]
(reference voltage output) and make calibration.
1440 pulse/s are output from the terminal FM.
*2 When a frequency meter is connected to across
terminals FM and SD to monitor the running
frequency, the FM terminal output reaches to the
maximum when output frequency is 100Hz or more
in the initial setting. In this case, the [Pr. 55] setting
has to be changed to the maximum frequency.
*3 For , calibration with [Calibration parameter
A700
CO (Pr.900)] is unavailable when [Pr.291 Pulse train
I/O selection =10,11,20,21,100] (fast pulse train
output).
79
SPECIFICATIONS
1