Mitsubishi Electric 800 Series Instruction Manual page 306

5.8.7 Output frequency detection
The inverter output frequency is detected and output as output signals.
Pr. Name
41 Up-to-frequency sensitivity 10%
M441
42 Output frequency
M442 detection
43 Output frequency
M443 detection for reverse
rotation
50 Second output frequency
M444 detection
870 Speed detection hysteresis 0 Hz
M400
 Output up-to-frequency sensitivity (SU signal, Pr.41)
• Up to frequency (SU) is output when the output frequency reaches the set frequency.
• The Pr.41 value can be adjusted within the range ±1% to ±100% considering the set frequency as 100%.
• This parameter can be used to check that the set frequency has been reached, and provide signals such as the operation
start signal for related equipment.
Set frequency Adjustment
range Pr.41
OFF OFF
ON
SU
 Output frequency detection (FU (FB) signal, FU2 (FB2) signal, Pr.42,
Pr.43, Pr.50)
• The Output frequency detection (FU/FU2) signal or the Speed detection (FB/FB2) signal is useful for applying or releasing
electromagnetic brake, etc.
• The FU signal is output when the output frequency (frequency command value) reaches or exceeds the Pr.42 setting.
• During PM motor control, the FB signal is output when the estimated actual motor rotations per minute reaches the Pr.42
setting. Under V/F control and Advanced magnetic flux vector control, the FU signal and the FB signal are output at the
same time.
• The frequency detection dedicated to motor rotation in reverse direction is enabled by setting the frequency in Pr.43.
• When Pr.43 ≠ "9999", forward rotation uses the Pr.42 setting and reverse rotation uses the Pr.43 setting.
• When outputting a frequency detection signal separately from the FU (FB) signal, set the detection frequency in Pr.50.
When the output frequency reaches the Pr.50 setting or higher, the FU2 (FB2) signal is output.
Forward
rotation
Output
signal
FU (FB) OFF ON
FU2 (FB2) OFF ON
Initial value Setting range
0 to 100%
6 Hz 0 to 590 Hz
9999 0 to 590 Hz
9999
30 Hz 0 to 590 Hz
0 to 5 Hz
Time
Pr.50
Pr.42
Reverse
rotation
OFF ON
OFF ON
Description
Set the level where the SU signal turns ON.
Set the frequency where the FU (FB) signal turns ON.
Set the frequency where the FU (FB) signal turns ON in
reverse rotation.
Same as the Pr.42 setting.
Set the frequency where the FU2 (FB2) signal turns ON.
Set the hysteresis width for the detected frequency.
Pr.43
Time
Pr.50
OFF
OFF
5.8 (M) Monitor display and monitor output signal
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5
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5. PARAMETERS