Mitsubishi Electric 800 Series Instruction Manual page 259

*1 The upper limit of stall prevention operation is limited internally to the following. 120% (SLD rating), 150% (LD rating)
 Setting the stall prevention operation level (Pr.22)
• For Pr.22 Stall prevention operation level, set the ratio of the output current to the inverter's rated current at which the
stall prevention operation will be activated. Normally, use this parameter in the initial setting.
• Stall prevention operation stops acceleration (makes deceleration) during acceleration, makes deceleration during
constant speed, and stops deceleration during deceleration.
• When the stall prevention operation is performed, the Overload warning (OL) signal is output.
NOTE
• A continuous overloaded condition may activate a protective function such as motor overload trip (electronic thermal O/L
relay function) (E.THM).
• When Pr.156 has been set to activate the fast response current limit (initial value), the Pr.22 setting should not be higher
than 140%. Such setting will prevent torque generation
• Under PM motor control, the stall prevention operation level is reduced inversely proportional to the output frequency in
the constant output range of the rated motor frequency or higher.
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5. PARAMETERS
5.7 (H) Protective function parameter
Pr.22
Constant
speed
OL
Stall prevention operation example
Output current
Output frequency
Time