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Pr.900 “FM terminal calibration”
• The meter connected to terminal FM can be calibrated from the
parameter unit. This calibration function is common to all
monitored data selected in Pr. 54 “FM terminal function selection”.
• Terminal FM provides the pulse output as shown below. The
setting of Pr. 900 “FM terminal calibration” allows the meter
connected to the converter to be calibrated from the parameter
unit without providing a calibration resistor.
• Monitoring using a digital meter
A digital value can be displayed on a digital counter using the
pulse train signal from the FM terminal. By making monitoring
selection, the ratios of the FM terminal monitoring can be set in Pr.
51 “input power monitoring reference”, Pr. 53 “input voltage
monitoring reference”, Pr. 55 “bus voltage monitoring reference”
and Pr. 56 “current monitoring reference”.
Note: Calibration need not be made using Pr. 900 “FM terminal
calibration”. This resistor is used when calibration must be
made near the frequency meter for such a reason as a
remote frequency meter. Note that the needle of the
frequency meter may not deflect to full-scale when the
calibration resistor is connected. In this case, use both the
resistor and Pr. 900 “FM terminal calibration” to make
calibration.
To make the output calibration of
terminal FM
Meter
DC ammeter
1mA full-scale
FM
Meter
1mA full scale
Analog meter
( - )
(+ )
Calibration resistor (Note)
FM
SD
1mA
T1
DC8V
Pulse width T1: Adjusted with Pr. 900
Digital meter
Example: Koyo Electronic Industry's TC-41
1440 pulses/s
Digital indicator
+
-
FM
SD