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5 Monitor
High-function General-purpose Inverter RX2 Series User’s Manual
5-1 Frequency Monitor
5
5-1-3 Frequency Conversion Monitor
The frequency conversion monitor displays the value obtained by multiplying the frequency command
(Hz) by coefficient which is set in the Frequency conversion gain [Ab-01]. Use this method when you
want to change the displayed value of data such as motor rotation speed, etc.
Example of conversion of displayed frequency
“Output frequency conversion monitor [dA-06]” = “Frequency command (Hz)” x “Frequency conversion
gain [Ab-01]”
(Example) Displaying the motor rotation speed
The relationship of rotation speed and frequency is as shown below:
Rotation speed N (min
-1
) = (120 x f (Hz))/P (poles)
When the motor frequency is 60Hz and the number of poles is 4, the coefficient is 30; hence at 60Hz,
where [Ab-01]=30.00, “60×30.0=1800 (min
-1
)” will be displayed on the monitor.
Table of sample conversions
Precautions for Correct Use
In this monitor, gain is applied to the output frequency monitor [dA-01].
Parameter
5-1-3 Frequency Conversion Monitor
Motor frequency
(Hz)
Number of motor poles
(P)
Coefficient
[Ab-01]
Synchronous rotation
[min-1]
50 2 60 3000
50 4 30 1500
50 6 15 750
50 8 7.5 375
60 2 60 3600
60 4 30 1800
60 6 15 900
60 8 7.5 450
Item Parameter Data Description
Output frequency
conversion monitor
[dA-06] 0.00 to 59000.00 (Hz) Converted output frequency is displayed.
Frequency conver-
sion gain
[Ab-01] 0.01 to 100.00
Set the gain of frequency conversion mon-
itor.
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