Mitsubishi Electric FR-E800 Series Instruction Manual page 303

• When Pr.43 ≠ "9999", the Pr.42 setting is for the forward rotation operation and the Pr.43 setting is for the reverse rotation
operation.
(Hz)
Output
signal
FU/FB OFF
• 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.
Output signal
FU 4
FB 41
 Low speed detection (LS signal, Pr.865)
• When the output frequency drops to the setting of Pr.865 Low speed detection or lower, the Low speed detection (LS)
signal is output.
• The fault "E.OLT" displays and the inverter output shuts off if the torque limit operation causes the frequency to drop to the
frequency set in Pr.865 and the output torque to surpass the value set in Pr.874 OLT level setting for three seconds or
longer in the speed control mode under Real sensorless vector control or PM sensorless vector control.
• To use the LS signal, set "34" (positive logic) or "134" (negative logic) in any parameter from Pr.190 to Pr.196 (Output
terminal function selection) to assign the function to the output terminal.
Pr.865
LS ON
 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 following signals may chatter (turns ON and OFF repeatedly).
• Up to frequency (SU) signal
• Speed detection (FB) signal
• Low speed detection (LS) signal
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
302
12. (M) Item and Output Signal for Monitoring
12.7 Output frequency detection
Forward
rotation
Pr.42
Reverse
rotation
ON OFF
Pr.190 to Pr.196 settings
Positive logic Negative logic
104
141
OFF ON
ON
ON
Pr.43
Time
ON OFF
Related Parameter
42, 43
Time
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
ON ON
Example of the up to frequency (SU) signal
Time
ON