Mitsubishi Electric 800 Series Instruction Manual page 274

 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.
Pr.37 Pr.144
Setting Setting
0 0 0.01 Hz
(initial
2 to 12 0.01 Hz (initial setting)
value)
102 to 112
1 r/min
1 to 9998 0 0.01 Hz
2 to 12
1 (machine speed
102 to 112 0.01 Hz
Motor speed r/min conversion formula:.... frequency  120 / number of motor poles (Pr.144)
*1
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).
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 or PM motor control is selected, the actual motor speed
(estimated value by motor slip calculation) 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.
• 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 a certain type of communication option is used, the frequency display (setting) is used regardless of the Pr.37 and
Pr.144 settings. Refer to the Instruction Manual of each communication option for details. (The frequency display (setting)
is always used for HMS network options.)
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
page 253
Pr.1 Maximum frequency
Pr.52 Operation panel main monitor selection
Pr.81 Number of motor poles
Pr.800 Control method selection
Output frequency Set frequency monitor
monitor
0.01 Hz
0.01 Hz (initial setting)
*1 *1
1 r/min
0.01 Hz
*1
) 1 (machine speed
0.01 Hz
page 274
page 145
page 145
Running speed
monitor
*1
1 r/min
*1
1 r/min (initial setting)
*1
1 r/min
*1
1 (machine speed )
*1 *1
) 1 (machine speed )
*1
1 r/min
5.8 (M) Monitor display and monitor output signal
3
4
Frequency setting
parameter setting
0.01 Hz
5
0.01 Hz (initial setting)
*1
1 r/min
0.01 Hz
5
*1
1 (machine speed )
0.01 Hz
5
6
7
8
9
10
273
5. PARAMETERS