Controlled Stop Operation At Power Loss - Omron 3G3MX2 User Manual

"B" Group: Fine Tuning Functions

3-6-14 Controlled Stop Operation at Power Loss

Power
DC bus voltage
Under-voltage
level
Output frequency
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 , the inverter decreases the output frequency by the amount
set in . (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
. If the DC bus voltage rises up to the set value of , 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 , the inverter
starts deceleration according to the set value of  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 <, then the inverter internally swaps the  and
B051 values. However the displayed values are not changed.
OFF


Section 3-6

139