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Function assignment of external
terminal and control
4.11.6 Detection of output frequency (SU, FU, FU2 signal, Pr. 41 to Pr. 43, Pr. 50,
Pr. 870)
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 signal turns ON.
43
Output frequency detection
for reverse rotation
9999
0 to 400Hz
Set the frequency where the FU 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 signal turns ON.
870 Speed detection hysteresis 0Hz* 0 to 5Hz Set the hysteresis width for the detected frequency.
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
* Performing IPM parameter initialization changes the settings. (Refer to page 80)
(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 signal, FU2
signal, Pr. 42, Pr. 43, Pr. 50)
⋅ When the output frequency rises to or above the Pr. 42
setting, the output frequency detection signal (FU) is
output.
⋅ This function can be used for electromagnetic brake
operation, open signal, etc.
⋅ Frequency detection that is dedicated to reverse
operation can be set by setting detection frequency to Pr.
43. This function is effective for switching the timing of
electromagnetic brake operation between forward
rotation (rise) and reverse rotation (fall) during vertical lift
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. The
FU2 signal 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 left
table.
Output frequency
(Hz)
ON
Set frequency Adjustment
range
Pr.41
SU
Time
OFFOFF
Output
signal
Forward
rotation
Reverse
rotation
Time
Output frequency
(Hz)
ON ON
OFF OFFOFF
OFF OFF OFF
ON
ON
FU2
Pr.50
Pr.43
Pr.50
Pr.42
FU
Parameter
Number
Output
Signals
Pr. 190 to Pr. 196 Setting
Positive
logic
Negative
logic
42, 43 FU 4 104
50 FU2 5 105