Filter
Top Products
246
Function assignment of external terminal and control
4.15.7 Detection of output frequency (SU, FU, FU2 , FU3, FB, FB2, FB3, LS signal,
Pr. 41 to Pr. 43, Pr. 50, Pr. 116, Pr. 865)
The inverter output frequency is detected and output to the output signal.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
41 Up-to-frequency sensitivity 10% 0 to 100% Set the level where the SU signal turns ON.
42 Output frequency detection 6Hz 0 to 400Hz
Set the frequency where the FU (FB) signal turns
ON.
43
Output frequency detection
for reverse rotation
9999
0 to 400Hz
Set the frequency where the FU (FB) signal turns ON
in reverse rotation.
9999 Same as Pr. 42 setting
50
Second output frequency
detection
30Hz 0 to 400Hz
Set the frequency where the FU2 (FB2) signal turns
ON.
116
Third output frequency
detection
60Hz 0 to 400Hz
Set the frequency where the FU3 (FB3) signal turns
ON.
865 Low speed detection 1.5Hz 0 to 400Hz Set the frequency where the LS signal turns ON.
(1) Up-to-frequency sensitivity (SU signal, Pr. 41)
⋅ When the output frequency reaches the set frequency, the up-to-frequency
signal (SU) is output.
⋅ The Pr. 41 value can be adjusted within the range ±1% to ±100% on the
assumption that the set frequency is 100%.
⋅ This parameter can be used to ensure that the set frequency has been
reached to provide the operation start signal etc. for related equipment.
(2) Output frequency detection (FU (FB) signal, FU2 (FB2) signal, FU3 (FB3) signal, Pr. 42, Pr. 43,
Pr. 50, Pr. 116)
⋅ When the output frequency rises to or above the Pr. 42 setting, the output frequency detection signal (FU, FB) is
output.
⋅ This function can be used for electromagnetic brake operation, open signal, etc.
⋅ The FU (FU2, FU3) signal is output when the output frequency (frequency command) reaches the set frequency.
The FB (FB2, FB3) signal is output when the actual rotation detection speed (estimated speed in Real sensorless
vector control, feedback value in vector control) of the motor reaches the set frequency. The FU signal and FB
signal are output simultaneously during V/F control, Advanced magnetic flux vector control and encoder feedback
control.
⋅ When the detection frequency is set in Pr. 43, frequency detection used exclusively for reverse rotation can also be
set. This function is effective for switching the timing of electromagnetic brake operation between forward rotation
(rise) and reverse rotation (fall) during elevator operation, etc.
⋅ When Pr. 43
≠ "9999", the Pr. 42 setting applies to forward rotation and the Pr. 43 setting applies to reverse rotation.
⋅ When outputting a frequency detection signal besides the FU signal, set the detection frequency in Pr. 50 or Pr. 116.
The FU2 (FB2) signal (FU3(FB3) signal if Pr. 116 or more) is output when the output frequency reaches or exceeds
the Pr. 50 setting.
⋅ For each signal, assign functions to Pr. 190 to Pr. 196 (output terminal function selection) referring to the table below.
Output frequency
(Hz)
ON
Set frequency Adjustment
range
Pr.41
SU
Time
OFFOFF
Forward
rotation
Pr.116
Pr.50
Pr.42
Pr.43
Pr.50
Pr.116
OFFONOFFONOFF
Time
(Hz)
FU/FB
FU2/FB2
FU3/FB3
Output
signal
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
Output frequency
Reverse
rotation
Parameter
Number
Output
Signal
Pr. 190 to Pr. 196
Setting
Positive
logic
Negative
logic
42, 43
FU 4 104
FB 41 141
50
FU2 5 105
FB2 42 142
116
FU3 6 106
FB3 43 143