The default for 230V models is 390.0; the default for 460V models is 780.0.
Set Pr.06-01 to 0.0 disables the over-voltage stall prevention function (connected with braking
unit or brake resistor).
During deceleration, the DC bus voltage may exceed its Maximum Allowable Value due to motor
regeneration. When this function is enabled and the DC bus voltage detected is too high, the
drive stops decelerating (output frequency remains unchanged) until the DC bus voltage drops
below the setting value.
This parameter is suitable for uncertain load inertia. When stopping under normal load, the over-
voltage does not occur during deceleration and meet the deceleration time setting. Sometimes it
may not stop due to over-voltage during decelerating to STOP when the load regenerative
inertia increases. In this case, the AC motor drive extends the deceleration time automatically
until the drive stops. If the deceleration time affects your application, it is not recommended to
use this function. You can also install a brake resistor to absorb the excessive regenerative
voltage.
high voltage at DC side
over-voltage
detection level
output
frequency
time
Deceleration characteristic
when Over-Voltage Stall
Prevention enabled
Frequency Held
time
previous deceleration time
actual time to decelerate to stop when over-voltage
stall prevention is enabled
During acceleration, the AC motor drive output current may increase abruptly and exceed the
value specified in Pr.06.01 due to rapid acceleration or excessive load on the motor. When this
function is enabled, the AC motor drive stops accelerating and keeps the output frequency
constant until the current drops below this setting.
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