Adjustment Of Terminal Fm And Terminal Am - Mitsubishi Electric 800 Series Instruction Manual

(M) Monitor display and monitor output signal
5.11.4

Adjustment of terminal FM and terminal AM

By using the operation panel or parameter unit, terminals FM and AM can be adjusted (calibrated) to the full scale.
Pr.
900
FM terminal calibration
M310
901
AM terminal calibration
M320
867
AM output filter
M321
Terminal FM calibration (Pr.900)
• The terminal FM is preset to output pulses. By setting Pr.900, the meter connected to the inverter can be calibrated by
parameter setting without use of a calibration resistor.
• The pulse train output via terminal FM can be used for digital display on a digital counter. The output is 1440 pulses/s at full
scale. (Refer to page 357
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, perform calibration using
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.
• Calibrate the terminal FM in the following procedure.
1) Connect an indicator (frequency meter) across terminals FM and 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) Set a monitor item in Pr.54 FM terminal function selection. (Refer to
When the output frequency or inverter output current is selected on the monitor, set the output frequency or current
value at which the output signal will be 1440 pulses/s, using Pr.55 Frequency monitoring reference or Pr.56 Current
monitoring reference beforehand. Normally, at 1440 pulses/s the meter deflects to full-scale.
4) If the meter needle does not point to maximum even at maximum output, calibrate it with Pr.900.
362
PARAMETERS
Name Initial value
―
―
0.01 s
for the full-scale value of each monitor item.)
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)
Setting range
―
―
0 to 5 s
T1
8VDC
T2
page
Description
Calibrates the scale of the meter
connected to terminal FM.
Calibrates the scale of the analog meter
connected to terminal AM.
Set the terminal AM output filter.
(Digital indicator)
1440 pulses/s(+)
FM
SD
357.)
(-)