Mitsubishi Electric 800 Series Instruction Manual page 562

 Adjustment of regeneration avoidance operation (Pr.665, Pr.886)
• When the frequency becomes unstable at the time of regeneration avoidance operation, set the setting value for Pr.886
Regeneration avoidance voltage gain smaller. On the other hand, if an overvoltage fault occurs due to a sudden
regeneration, increase the setting.
• When the vibration cannot be stabilized even if the setting value of Pr.886 is made smaller, set the setting value of Pr.665
Regeneration avoidance frequency gain smaller.
NOTE
• During the regeneration avoidance operation, the stall prevention (overvoltage) (oL) is displayed and the overload alarm
(OL) signal is output. The operation when the OL signal is output can be set with Pr.156 Stall prevention operation
selection. The OL signal output timing can be set with Pr.157 OL signal output timer.
• The stall prevention is enabled even at the time of regeneration avoidance operation.
• The regeneration avoidance function cannot decrease the actual deceleration time for the motor to stop.
Parameters referred to
Pr.1 Maximum frequency page 253
page 190
Pr.8 Deceleration time
Pr.22 Stall prevention operation level
page 257
561
5. PARAMETERS
5.13 (G) Control parameters
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5
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9
10