Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual page 156

Output
frequency
(Hz)
Pr.42
OFF
ON
FU
ON
Example of output frequency detection signal (FU)
REMARKS
The output frequency compared with the set frequency changes depending on the control method.
Control Method
V/F control
Simple magnetic flux vector control
IPM motor control
CAUTION
⋅ Changing the terminal assignment using Pr. 190 to Pr. 196 (output terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 190 to Pr. 196 (output terminal function selection)
(3) Speed detection hysteresis (Pr.870)
⋅
This function prevents chattering of the speed detection sig-
nals.
When an output frequency fluctuates, the up to frequency
Pr.870
signal (SU) and output frequency detection signals (FU and
FU2) may repeat ON/OFF (chatters).Setting hysteresis to
the detected frequency prevents chattering of these signals.
OFF
ON
REMARKS
Setting a higher value to this parameter slows the response of
frequency detection signals (SU, FU, and FU2).
Compared Output Frequency
Output frequency
Output frequency before slip compensation
Estimated frequency (actual motor rotation per minute)
Refer to page 140
Function assignment of external
terminal and control
4
145