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"B" Group: Fine Tuning Functions Section 3-6
3-6-14 Controlled Stop Operation at Power Loss
Controlled stop operation at power loss helps avoid tripping or free-running
(coasting) of the motor when power is lost while in run mode. The inverter
controls the internal DC bus voltage while decelerating the motor, and brings
the motor to a controlled stop.
Should power be lost while the inverter is in run mode, this function will have
the following effect:
1. When the internal DC bus voltage of the inverter comes down to the set
level of B051, the inverter decreases the output frequency by the amount
set in B054. (During this interval the DC bus voltage rises due to regener-
ation, so does not reach the UV level.)
2. The inverter then continues deceleration according to the value set in
B053. If the DC bus voltage rises up to the set value of B052, the inverter
stops deceleration to avoid OV tripping.
3. During this interval, the DC bus voltage decreases again due to lack of in-
put power.
4. When the DC bus voltage comes down to the set value of B051, the inverter
starts deceleration according to the set value of B053 again. This process
will be repeated as needed until the motor is brought to a stop.
Note If the DC bus voltage comes down to the UV level during this operation, the
inverter trips with under-voltage and motor will free-run (coast) to a stop.
Note If the set value of B052<B051, then the inverter internally swaps the B052 and
B051 values. However the displayed values are not changed.
Note This function cannot be interrupted until it is completed. So if the power is
restored during this operation, wait until the operation is done (motor stops)
and then give the run command.
Power
DC bus voltage
Output frequency
b052
b051
Under-voltage
level
OFF
b054
b053
b053
b053
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