Mitsubishi Electric 800 Series Instruction Manual (Function page 492

NOTE
• During the regeneration avoidance operation, the stall prevention (overvoltage) "OLV" is displayed and the Overload warning
(OL) signal is output. Set the operation pattern at an OL signal output using Pr.156 Stall prevention operation selection.
Use Pr.157 OL signal output timer to set the OL signal output timing.
• The stall prevention is enabled even during regeneration avoidance operation.
• The regeneration avoidance function cannot decrease the actual deceleration time for the motor to stop. Since the actual
deceleration time is determined by the regenerative power consumption performance, consider using a regeneration unit (FR-
BU2, BU, FR-BU, FR-XC, FR-CV, FR-HC2) or brake resistor (FR-ABR, etc.) to decrease the deceleration time.
• When using a regeneration unit (FR-BU2, BU, FR-BU, FR-XC, FR-CV, FR-HC2) or brake resistor (FR-ABR, etc.) to consume
the regenerative power at constant speed, set Pr.882 = "0 (initial value)" (the regeneration avoidance function is disabled).
When consuming the regenerative power at the time of deceleration with the regeneration unit, etc., set Pr.882 = "2" (enables
regeneration avoidance function only at the constant speed).
• When using the regeneration avoidance function under Vector control, noise may be generated from the motor during
deceleration. In such case, adjust the gain. (Refer to
Parameters referred to
Pr.1 Maximum frequencypage 292
Pr.8 Deceleration timepage 292
Pr.22 Stall prevention operation levelpage 295
page 129.)
17.9 Regeneration avoidance function
491
17. (G) Control Parameters
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