Output Current Detection Function - Mitsubishi Electric FR-F820-00046 Instruction Manual

• To use each signal, set the corresponding number selected from the following table in any of Pr.190 to Pr.196 (Output
terminal function selection) to assign the function to an output terminal.
Pr.190 to Pr.196 settings
Output
signal
Positive logic
FU 4
FB 41
FU2 5
FB2 42
 Speed detection hysteresis (Pr.870)
• Setting the hysteresis width for the detected frequency prevents chattering of the Speed detection (FB) signal. When an
output frequency fluctuates, the Up to frequency (SU) signal and the Output frequency detection signals (FB and FB2) may
chatter (turns ON and OFF repeatedly).
Setting hysteresis to the detected frequency prevents chattering of these signals.
Output
frequency
(Hz)
Pr.42
FB
ON
Example of the speed detection (FB) signal
NOTE
• In the initial setting, the FU signal is assigned to terminal FU, and the SU signal is assigned to terminal SU.
• All signals shown in the following table are OFF during the DC injection brake operation and during tuning at start-up.
• The reference frequency in comparison with the set frequency differs depending on the control method.
Control method or function
V/F control
Advanced magnetic flux vector control
PM motor control
• Setting a higher value in Pr.870 causes a lower responsivity of the signals for frequency detection (SU, FB, and FB2 signals).
• Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
Parameters referred to
Pr.190 to Pr.196 (Output terminal function
5.8.8

Output current detection function

If the inverter output current which reaches a specific value is detected, the relative signal is output via an output terminal.
Related
Parameter
Negative logic
104
42, 43
141
105
50
142
Output frequency
Pr.870
ON
ON
Output frequency
Output frequency before the slip
compensation
Frequency command value
selection)page 312
(Hz)
Pr.870
SU output level
Pr.870
Pr.41
Set frequency
Pr.870
SU output level
Pr.870
SU signal
Example of the up to frequency (SU) signal
Reference frequency
FU, FU2
5.8 (M) Item and output signal for monitoring
ON ON
ON
FB, FB2, SU
Output frequency
Output frequency before the slip
compensation
Estimated frequency (actual motor
speed)
5. PARAMETERS
1
2
3
4
5
6
7
Time
8
9
10
321