4-2 Function Mode 4 Functions „ Operation Description A If the power is disconnected during operation with the momentary power interruption non-stop function enabled (b050 = 01) and the voltage falls below the momentary power interruption non- stop function starting voltage (b051), the output frequency is decelerated with one stroke in accordance with the momentary power interruption non-stop deceleration starting width (b054) (Internal DC voltage rises due to the regenerative energy generated at this time.) B While deceleration continues in accordance with the momentary power interruption non-stop deceleration time (b053), internal DC voltage increases, and once the voltage reaches the stop deceleration level of non-stop function (b052), deceleration ceases.
C Internal DC voltage decreases because there is no power supply during this constant speed operation. D Deceleration starts again according to b053 after the internal DC voltage decreases to b051. Then, after a recurrence from B, the operation eventually stops without a trip. If the internal DC voltage has dropped below the undervoltage level during this function, output is shut off after an undervoltage trip to enter free-run status.
(Caution) •When the momentary power interruption non-stop deceleration level (b052) is below the momentary power interruption non-stop function starting voltage (b051), the Inverter performs this function by increasing b052 to b051 without an automatic setting change. •This function is not reset before completion. To run the Inverter after power recovery during this function, input the RUN command after entering the STOP command when stopped. 4-34 Power supply OFF A B C D Internal DC b052 voltage b051 Undervoltage level Output frequency b054 b053 b053 b053 OFF b053