Mitsubishi Electric 800 Series Instruction Manual page 361

(M) Monitor display and monitor output signal
Current monitor reference (Pr.56)
• Output current, Output current peak value, Motor excitation current and monitor from the terminals FM and AM.
• For the calibration of terminal FM, set the full-scale value of the connected meter when the pulse speed of terminal FM is
1440 pulses/s (50k pulses/s).
Set the current to be indicated as the full scale value to the meter (1 mA analog meter) connected between terminal FM and
SD.
Pulse speed is proportional to the monitored value of output current. (Maximum pulse train output is 2400 pulses/s (55k
pulses/s).)
• For the calibration of terminal AM, set the full-scale value of the connected current meter when the output voltage of
terminal AM is 10 VDC.
Set the current to be indicated as the full scale value on the meter (10 VDC voltmeter) connected between terminal AM and
5.
Output voltage is proportional to the monitored value of output current. (The maximum output voltage is 10 VDC.)
Torque monitor reference (Pr.866)
• Set the full scale value when outputting the current monitor from terminal the FM or AM.
• For the calibration of terminal FM, set the full-scale value of the connected torque meter when the pulse speed of terminal
FM is 1440 pulses/s (50k pulses/s). Set the torque to be indicated as the full scale value on the meter (1 mA analog meter)
connected between terminals FM and SD.
Pulse speed is proportional to the monitored value of torque. (Maximum pulse train output is 2400 pulses/s (55k pulses/s).)
• For the calibration of terminal AM, set the full-scale value of the connected torque meter when the output voltage of terminal
AM is at 10 VDC.
Set the torque to be indicated as the full scale value on the meter (10 VDC voltmeter) connected between terminal AM and
5.
Output voltage is proportional to the monitored value of torque. (The maximum output voltage is 10 VDC.)
Terminal FM pulse train output (Pr.291)
• Two kinds of pulse trains can be output to the terminal FM.
FM output circuit
Inverter
24V
2.2K
3.3K
20K
FM
Calibration
resistor ∗1
SD

Not needed when the operation panel or the 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.
360
PARAMETERS
• When Pr.291
output with a maximum output of 8 VDC and 2400 pulses/s.
The pulse width can be adjusted by using the operation panel or parameter
unit and calibration parameter Pr.900 FM terminal calibration.
• Commands can be sent (such as inverter output frequency) by connecting
a 1 mA full-scale DC ammeter or a digital meter.
FM
SD
Indicator
1mA full-scale
analog meter
1mA
(+) (-)
Pulse width T1: Adjust using calibration parameter 900
Pulse cycle T2: Set with Pr.55 (frequency monitor)
Set with Pr.56 (current monitor)
Pulse train I/O selection
T1
8VDC
T2
= "0 (initial value) or 1", this is FM
(Digital indicator)
1440 pulses/s(+)
FM
SD
(-)