Mitsubishi Electric 800 Series Instruction Manual page 261

 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 (overvoltage stall).
Pr.157 setting
0 (initial value) Output immediately.
0.1 to 25 Output after the set time (s).
9999 Not output.
Overload state
(OL operation)
OL output signal
Pr.157 Set time(s)
NOTE
• 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.
260
5. PARAMETERS
5.7 (H) Protective function parameter
Description