Mitsubishi Electric FR-A820-00046 Instruction Manual page 544

(M) Monitor display and monitor output signal
Monitor display (setting) increments
● When both Pr. 37 and Pr. 144 have been set, their priorities are as given below.
Pr. 144 = 102 to 112 > Pr. 37 = 1 to 9998 > Pr. 144 = 2 to 12
● The combination of the Pr. 37 and Pr. 144 settings as shown below determines the setting
increment for each monitor. (The initial values are shown in grey shaded fields.)
Pr. 37
Setting
0
(initial
value)
1 to 9998
Tab. 5-129: Setting range of parameter 37 and 144
Motor speed r/min conversion formula:
Machine speed conversion formula:
For Pr. 144 in the above formula, the value is "Pr. 144 – 100" when "102 to 112" is set in Pr. 144; and
the value is "4" when Pr. 37 = 0 and Pr. 144 = 0.
Pr. 505 is always set as frequency (Hz).
Use Pr. 811 to change the increment from 1 r/min to 0.1 r/min.
NOTES The inverter's output frequency is displayed as synchronous speed under V/F control. The dis-
played value is "actual motor speed" + "motor slip." When Advanced magnetic flux vector control,
Real sensorless vector control or PM sensorless vector control is selected, the actual motor speed
(estimated value by motor slip calculation) is used. When the encoder feedback control or vector
control is selected, the actual motor speed from the encoder is used.
When Pr. 37 = "0" and Pr. 144 = "0", the running speed monitor is displayed with the number of
motor poles 4. (Displays 1800 r/min at 60 Hz)
To change the PU main monitor (PU main display), refer to Pr. 52.
If the setting increment is changed to 1 r/min (Pr. 811 = "0,10") after setting the running speed in
0.1 r/min (Pr. 811 = "1,11"), the 0.1 r/min increment may be dropped, in order for the rotations per
minute resolution to change from 0.1 r/min to 0.3 r/min (when using four poles).
When using the machine speed display for the parameter unit (FR-PU07), do not change the speed
with the up/down key if a set speed above 65535 is being displayed. The set speed may become
an undetermined value.
When the FR-A8ND option is connected, the frequency display (setting) will be used regardless of
the Pr. 37, Pr. 144 settings.
When Pr. 811 = "1 or 11" with the 0.1 r/min increment, the upper limit is as follows.
Speed command setting range: 6000 r/min for 2 to 10 motor poles, 5900 r/min for 12 motor poles
Running speed monitor such as the operation panel: 6553.5 r/min
Full scale of the running speed motor for analog output (terminals FM, CA and AM): 6000 r/min
5 - 342
Pr. 144 Output frequency
Setting monitor
0 0.01 Hz
2 to 12 0.01 Hz
102 to 112
1 r/min
0 0.01 Hz
2 to 12
1 (machine speed )
102 to 112 0.01 Hz
Running speed
Set frequency monitor
0.01 Hz
0.01 Hz
1 r/min
0.01 Hz
1 (machine speed )
1 (machine speed ) 1 (machine speed )
0.01 Hz
Frequency ×120 / Number of motor poles (Pr. 144)
Pr. 37 × Frequency / Pr. 505
Parameters
Frequency setting
monitor parameter setting
0.01 Hz
1 r/min
0.01 Hz
1 r/min
1 r/min 1 r/min
0.01 Hz
1 (machine speed )
0.01 Hz
1 r/min