Mitsubishi Electric FR-A700 Instruction Manual page 254

Function assignment of external terminal and control
Pr.865
LS ON
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 output frequency to be compared with the set frequency at the SU signal and LS signal differs according to
the control method.
Control Method
V/F control
Advanced magnetic
flux vector control
Real sensorless
vector control
Encoder feedback
control, vector control
CAUTION
⋅ When terminal assignment is changed using Pr. 190 to Pr. 196 (output terminal function selection), the other functions may be
affected. Please make setting after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 190 to Pr. 196 (output terminal function selection)
Pr. 874 OLT level setting
244
Time
OFF ON
Compared Output Frequency
Output frequency
Output frequency before slip compensation
Frequency (actual motor speed) estimated value
Value of actual motor rotation represented in terms
of frequency setting
Refer to page 236
Refer to page 99
(3) Low speed detection (LS signal, Pr. 865)
⋅ The low speed detection signal (LS) is output when the
output frequency reduces below the Pr. 865 Low speed
detection setting.
⋅ When speed control is performed by real sensorless
vector control or vector control, an alarm (E.OLT) is
displayed and the inverter output is stopped if frequency
drops to the 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.