Mitsubishi Electric FR-F820-04750 Instruction Manual page 398

(M) Monitor display and monitor output signal
Output frequency detection
(FU (FB) signal, FU2 (FB2) signal, Pr. 42, Pr. 43, Pr. 50)
● Output frequency detection (FU (FB)) is output when the output frequency reaches the Pr. 42
setting or higher.
● The FU (FU2) signals can be used for electromagnetic brake operation, opening, etc.The FU (FU2)
signal is output when the output frequency (frequency command) reaches the set frequency.
● During PM motor control, the FB (FB2) signal is output when the estimated actual motor speed
reaches the set frequency (speed). Under V/F control and Advanced magnetic flux vector control,
the FU signal and the FB signal are output at the same time.
● Frequency detection that is dedicated to reverse rotation can be set by setting the detection
frequency in Pr. 43. This is useful for changing the timing of the electromagnetic brake operation
during forward rotation (lifting) and reverse rotation (lowering) in operations such as lift opera-
tion.
● 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.
Fig. 5-98:
● For each signal, refer to the following table and assign the function by Pr. 190 to Pr. 196 (output
terminal function selection).
Output signal
Tab. 5-105: Parameter setting for frequency detection for forward and reverse rotation
5 - 236
Forward
rotation
Output
signal
OFF
FU (FB)
OFF
FU2 (FB2)
Frequency detection for forward and reverse rotation
Positive logic
FU
FB
FU2
FB2
Pr. 50
Pr. 42
OFF
ON
ON OFF
Pr. 190 to Pr. 196 settings
Negative logic
4 104
41 141
5 105
42 142
Time
Pr. 43
Pr. 50
Reverse
rotation
ON OFF
OFF
ON
Related parameter
42, 43
Parameters
I003031E
50