238
Function assignment of external terminal and control
(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.
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.
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) Refer to page 230
Pr. 874 OLT level setting Refer to page 94
ONLS ONOFF
Pr.865
Output frequency
(Hz)
Time
Control Method Compared Output Frequency
V/F control Output frequency
Advanced magnetic
flux vector control
Output frequency before slip compensation
Real sensorless
vector control
Frequency (actual motor speed) estimated value
Encoder feedback
control, vector control
Value of actual motor rotation represented in terms
of frequency setting
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