Mitsubishi Electric FR-A720-0.4K Instruction Manual page 258

Pr.865
LS ON OFF
REMARKS
⋅ The FU signal is assigned to the terminal FU and the SU signal is assigned to the terminal SU in the initial setting.
⋅ All signals are OFF during DC injection brake, pre-excitation (zero speed control, servo lock), or start time tuning.
⋅ The type of frequency (output as the following signals), which is compared with the set frequency, differs by the
control method.
Control Method
V/F control Output frequency
Advanced magnetic
Output frequency before the slip compensation.
flux vector control
Real sensorless
Frequency command
vector control
Encoder feedback
Actual motor speed converted as frequency
control
Vector control Frequency command
CAUTION
⋅ When terminal assignment is changed using Pr. 190 to Pr. 196 (output terminal function selection), the other functions may be
affected. Set parameters after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 190 to Pr. 196 (output terminal function selection)
Pr. 874 OLT level setting Refer to page 100
(3) Low speed detection (LS signal, Pr. 865)
⋅ The low speed detection signal (LS) is output when the
output frequency drops below the Pr. 865 Low speed
detection setting.
⋅ When speed control is performed by Real sensorless
vector control or vector control, a fault (E.OLT) is
Time
displayed and the inverter trips if frequency drops to the
ON
Pr. 865 setting by torque limit operation and the output
torque exceeds Pr. 874 OLT level setting and remains for
more than 3s.
⋅ For the LS signal, set "34 (positive logic) or 134 (negative
logic)" in Pr. 190 to Pr. 196 (output terminal function
selection) and assign functions to the output terminal.
Compared frequency
FU, FU2, FU3
Refer to page 239
Function assignment of external terminal and control
FB, FB2, FB3, SU, LS
Output frequency
Output frequency before the slip compensation.
Estimated frequency (estimated from the actual
motor speed)
Actual motor speed converted as frequency
Actual motor speed converted as frequency
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