Adjusting the stall prevention operation signal output and output timing (OL signal, Pr. 157)
● If the output current exceeds the stall prevention operation level and stall prevention is activated,
Overload warning (OL) signal will turn ON for 100 ms or more. The output signal turns OFF when
the output current falls to the stall prevention operation level or less.
● Pr. 157 "OL signal output timer" can set whether to output the OL signal immediately, or to output
it after a certain time period.
● This function also operates during regeneration avoidance operation
OL output signal
OL signal is assigned to the terminal OL in the initial status. The OL signal can be assigned to other
terminals by setting "3 (positive logic) or 103 (negative logic)" in any of Pr. 190 to Pr. 196 (output
terminal function selection).
If the stall prevention operation has lowered the output frequency to 0.5 Hz and kept the level for
3 s, the stall prevention stop (E.OLT) is activated to shut off the inverter output.
Changing the terminal assignment using Pr. 190 to Pr. 196 (output terminal function selection)
may affect the other functions. Set parameters after confirming the function of each terminal.
Pr. 157 setting
0 (initial value)
0.1 to 25
Setting of parameter 157
Pr. 157 Set time (s)
(H) Protective function parameter
Output after the set time (s).
Output of the OL signal
5 - 183