Output Frequency Detection - Mitsubishi Electric 800 Series Instruction Manual

11.7

Output frequency detection

If the inverter output frequency which reaches a specific value is detected, the relative signal is output.
Pr. Name
41 Up-to-frequency
M441 sensitivity
42 Output frequency
M442 detection
Output frequency
43
detection for reverse
M443
rotation
865
Low speed detection
M446
870 Speed detection
M400 hysteresis
*1 Gr.1 and Gr.2 are the parameter initial value groups. (Refer to
 Setting the notification zone of the output frequency reaching the set
point (SU signal, Pr.41)
• The Up to frequency (SU) signal is output when the output frequency reaches the set frequency.
• Set the value in the range of 1% to 100% in Pr.41 to determine tolerance for the set frequency (considered as 100% point).
• It may be useful to use this signal to start operating related equipment after checking that the set frequency has been
reached.
• To use the SU signal, set "1" (positive logic) or "101" (negative logic) in one of Pr.190 to Pr.196 (Output terminal function
selection) to assign function to an output terminal.
Set frequency
OFF
ON
SU
 Output frequency detection (FU (FB) signal, Pr.42, Pr.43)
• The Output frequency detection (FU) signal and the Speed detection (FB) signal are output when the output frequency
reaches or exceeds the Pr.42 setting.
• The FU signal is useful for applying or releasing electromagnetic brake, etc.
• The FU signal is output when the output frequency (frequency command) reaches the set frequency. The FB signal is
output when the detected actual speed (estimated speed under Real sensorless vector control) of the motor reaches the
set frequency. 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. This
setting is useful when the timing of the electromagnetic braking during forward rotation operation (for example, during lifting
up in the lifts operation) is different from that during reverse rotation operation (lifting down).
*1
Initial value
Setting
range
Gr.1 Gr.2
10% 0% to 100%
6 Hz 0 to 590 Hz
0 to 590 Hz
9999
9999
1.5 Hz 0 to 590 Hz
0 Hz 0 to 15 Hz
Adjustment
range Pr.41
Time
OFF
Set the level where the SU signal turns ON.
Set the frequency at which the FU (or FB) signal turns ON.
Set the frequency at which the FU (or FB) signal turns ON only
while the motor rotates in reverse direction.
The frequency same as the Pr.42 setting is set.
Set the frequency at which the LS signal turns ON.
Set the hysteresis width for the detected frequency.
page 82).
11. (M) Item and Output Signal for Monitoring
Description
11.7 Output frequency detection
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