Mitsubishi Electric FR-A720-0.4K Instruction Manual page 251

CAUTION
⋅ In the V/F control mode, the output frequency of the inverter is displayed in terms of synchronous speed, and therefore, it is
unequal to the actual speed by motor slip. This display changes to the actual speed (estimated value calculated based on the
motor slip) when the advanced magnetic flux vector control or real sensorless vector control is selected, and actual speed from
the encoder when encoder feed back control or vector control is performed.
⋅ When the running speed display is selected at the setting of Pr. 37 = "0" and Pr. 144 = "0", the monitor display is provided on the
assumption that the number of motor poles is 4. (1800r/min is displayed at 60Hz)
⋅ Refer to Pr. 52 when you want to change the PU main monitor (PU main display).
⋅ Since the panel display of the operation panel (FR-DU07) is 4 digits in length, the monitor value of more than "9999" is
displayed "----".
⋅ After setting the running speed in 0.1r/min increments (Pr. 811 = "1, 11"), changing the setting increments to 1r/min increments
(Pr. 811 = "1, 10") changes the speed resolution from 0.1r/min to 0.3r/min (four poles), which may round down 0.1r/min
increments.
⋅ When the machine speed is displayed on the FR-PU04/FR-PU07, do not change the speed by using an up/down key in the
state where the set speed exceeding 65535 is displayed. The set speed may become arbitrary value.
Make sure that the settings of the running speed and number of motor poles are correct. Otherwise, the motor
might run at extremely high speed, damaging the machine.
♦ Parameters referred to ♦
Pr. 52 DU/PU main display data selection
Pr. 80 Motor capacity, Pr. 81 Number of motor poles
Pr. 800 Control system selection
Pr. 811 Set resolution switchover
CAUTION
Refer to page 242
Refer to page 144
Refer to page 91
Refer to page 98
Monitor display and monitor output signal
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