Terminal Fm Calibration (Calibration Parameter C0 (Pr. 900)) - Mitsubishi Electric FR-D720-0.2K-G Instruction Manual

Monitor display and monitor output signal

4.12.4 Terminal FM calibration (calibration parameter C0 (Pr. 900))

By using the operation panel or parameter unit, you can calibrate terminal FM to full scale deflection.
Parameter
Number
C0 (900) FM terminal calibration

The above parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 161.)

The parameter number in parentheses is the one for use with the parameter unit (FR-PU07).

The above parameter allows its setting to be changed during operation in any operation mode even if "0" (initial value) is set in Pr. 77 Parameter write
selection.
(1) FM terminal calibration (C0 (Pr. 900))
The terminal FM is preset to output pulses. By setting the FM terminal calibration C0 (Pr. 900), the meter connected to the
drive unit can be calibrated by parameter setting without use of a calibration resistor.
Using the pulse train output of the terminal FM, a digital display can be provided to connect a digital counter.
The monitor value is 1440 pulses/s output at the full-scale value of monitor description list (page 134) (Pr. 54 FM terminal
function selection).
FM
Calibration
resistor ∗
SD
 Not needed when the operation panel or parameter unit (FR-PU07) is used for calibration.
Use a calibration resistor when the indicator (speed meter) needs to be calibrated by a neighboring device because the indicator is located far from the
drive unit.
However, the speed 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.
Calibrate the terminal FM in the following procedure.
1) Connect an indicator (speed meter) across terminals FM-SD of the drive unit. (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 134) and set Pr. 54.
When you selected the running speed or drive unit output current at monitor, preset the running speed or current
value, at which the output signal will be 1440 pulses/s, to Pr. 55 Speed monitoring reference or Pr. 56 Current monitoring
reference.
At 1440 pulses/s, the meter generally deflects to full-scale
REMARKS
 When calibrating a monitor output signal, which cannot be adjusted to 100% value without an actual load and a measurement
equipment, set Pr. 54 to "21" (reference voltage output). 1440 pulses/s are output from the terminal FM.
 The wiring length of the terminal FM should be 200m at maximum.
NOTE
 The initial value of the calibration parameter C0 (Pr. 900) is set to 1mA full scale and 1440 pulses/s terminal FM pulse
train output at the drive unit speed of 3000r/min. The maximum pulse train output of terminal FM is 2400 pulses/s.
Parameters referred to
Pr. 54 FM terminal function selection
Pr. 55 Speed monitoring reference
Pr. 56 Current monitoring reference
140
Name Initial Value
Indicator
1mA full-scale
analog meter
1mA
(+) (-)
8VDC
Pulse width T1: Adjust using calibration parameter C0
Pulse cycle T2: Set with Pr. 55 (speed monitor)
Set with Pr. 56 (current monitor)
Refer to page 134.
Refer to page 139.
Refer to page 139.
Setting Range
— —
T1
T2
Description
Calibrates the scale of the meter
connected to terminal FM.
(Digital indicator)
1440 pulses/s(+)
FM
SD
(-)