Mitsubishi Electric 800 Series Instruction Manual page 347

(M) Monitor display and monitor output signal
Monitor display (setting) increments
• When both settings of Pr.37 and Pr.144 are changed from the initial values, a precedence order for these settings is as
follows:
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 within the thick lines.)
Pr.37 Pr.144
Setting Setting
0
0
(initial 2 to 12
value)
102 to 112
0
1 to 9998 2 to 12
102 to 112
 Motor speed r/min conversion formula: .... frequency 120 / number of motor poles (Pr.144)
Machine speed conversion formula: ......... Pr.37 frequency / Pr.505
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.
NOTE
• The inverter's output frequency is displayed as synchronous speed under V/F control. The displayed 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 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 and AM): 6000 r/min
CAUTION
 Make sure to set the running speed and the number of motor poles.
Otherwise, the motor might run at extremely high speed, damaging the machine.
Parameters referred to ???????
Pr.1 Maximum frequency
Pr.22 Torque limit level page 154
Pr.52 Operation panel main monitor selection
Pr.81 Number of motor poles
Pr.800 Control method selection
Pr.811 Set resolution switchover
346
PARAMETERS
Output frequency
monitor
0.01 Hz
0.01 Hz
1 r/min

0.01 Hz
1 (machine speed )

0.01 Hz
page 329
page 347
page 137
page 137
page 154
Set frequency monitor
0.01 Hz 1 r/min
0.01 Hz 1 r/min
1 r/min 1 r/min

0.01 Hz 1 (machine speed
1 (machine speed ) 1 (machine speed

0.01 Hz 1 r/min
Running speed Frequency setting
monitor parameter setting
0.01 Hz

0.01 Hz

1 r/min

) 0.01 Hz

) 1 (machine speed

0.01 Hz


)
