Mitsubishi Electric FR-F800 Series Instruction Manual page 339

• When a different detection point of the frequency is required, Pr.50 is available. The FU2 (or FB2) signal can be set to be
output when the output frequency reaches the Pr.50 setting or higher.
Output
signal
FU (FB)
FU2 (FB2)
• To use each signal, set the corresponding number selected from the following table in any parameter from 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.
338
5. PARAMETERS
5.8 (M) Item and output signal for monitoring
Downloaded from ManualsNet.com
Forward
rotation
Pr.50
Pr.42
OFF ON OFF
OFF ON OFF
Negative logic
104
42, 43
141
105
50
142
ON
ON
Control method or function
V/F control
Advanced magnetic flux vector control
PM motor control
search engine
Pr.43
Pr.50
Reverse
rotation
ON OFF
ON OFF
Related
parameter
Output frequency
(Hz)
Pr.870
SU output level
Pr.870
Pr.41
Set frequency
Pr.870
Pr.870 SU output level
Pr.870
SU signal
FU, FU2
Output frequency
Output frequency before the slip
compensation
Frequency command value
Time
ON ON
Example of the up to frequency (SU) signal
Reference frequency
FB, FB2, SU
Output frequency
Output frequency before the slip
compensation
Estimated frequency (actual motor
speed)
Time
ON