Mitsubishi Electric FR-F800 Series Instruction Manual page 293

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 Setting of stall prevention operation level (Pr.22)

Stall prevention operation example

• 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 prevents 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.

5. PARAMETERS

5.7 (H) Protective function parameter

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Output current

Output frequency

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• 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 is 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.

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