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Function assignment of external terminal and control
4
PARAMETERS
(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
displayed and the inverter trips 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 type of frequency (output as the following signals), which is compared with the set frequency, differs by 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. Set parameters after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 190 to Pr. 196 (output terminal function selection) Refer to page 239
Pr. 874 OLT level setting Refer to page 100
ONLS ONOFF
Pr.865
Output frequency
(Hz)
Time
Control Method
Compared frequency
FU, FU2, FU3 FB, FB2, FB3, SU, LS
V/F control Output frequency Output frequency
Advanced magnetic
flux vector control
Output frequency before the slip compensation. Output frequency before the slip compensation.
Real sensorless
vector control
Frequency command
Estimated frequency (estimated from the actual
motor speed)
Encoder feedback
control
Actual motor speed converted as frequency Actual motor speed converted as frequency
Vector control Frequency command Actual motor speed converted as frequency