Hitachi X200 Series instruction manual 38, Non Stop Operation at Power OFF

Models: X200 Series

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Non Stop Operation at Power OFF

Non stop operation at power OFF helps to avoid tripping or free-running of the motor when power turns OFF during running. Inverter controls the internal DC bus voltage by decelerating the motor, and finally makes the motor stop.

Power

DC bus voltage

b052

b051

Undervoltage level

Output frequency

OFF

cd e f

b054

b053

b053

b053

Configuring Drive Parameters

cWhen the power turns OFF during running and the internal DC bus voltage of the inverter comes down to the set level of B051, the inverter decreases the output frequency, which is set in B054 in a short period. (In this moment the DC bus voltage rises thanks to the regeneration and does not go down to the UV level.)

dContinues deceleration according to the set value of B053. If the DC bus voltage rises up to the set value of B052, the inverter stop deceleration to avoid OV tripping.

eIn this period the DC bus voltage decreases because of no power input.

fWhen the DC bus voltage comes down to the set value of B051, the inverter starts deceleration according to the set value of B053 again. After this will be the repetition from d and finally comes to the motor to stop.

NOTE: If the DC bus voltage comes down to the UV level during this operation, the inverter trips with undervoltage and motor will be free-run.

NOTE: If the set value of B052<B051, then the inverter changes internally the B052 to B051. However the displayed value is not changed.

NOTE: This function cannot be interrupted until it is completed. So if the power is recovered during this operation, wait until the operation is done (motor stops) and then give the run command.

Page 112
Image 112
Hitachi X200 Series instruction manual 38, Non Stop Operation at Power OFF