4-2 Function Mode 4 Functions *1. If an overvoltage/overcurrent trip occurs during deceleration, momentary power interruption error E16 appears, and the motor goes into free-run status. In this case, increase the deceleration time. *2. When direct current (P-N) is supplied to control power supply terminal Ro-To, the Inverter may detect undervoltage at power interruption and then trip. If there is any problem with your system, set "00" or "02". *3. The Inverter may start at 0 Hz if: The output frequency is equal to or lower than 1/2 of the base frequency The motor induction voltage quickly attenuates *4.
Even if retry selection b001 is set to "Retry" (01 to 03) and selection of momentary power interruption/ undervoltage trip during stop b004 is set to "Disabled" (00 or 02), the Inverter trips when the actual momentary power interruption time exceeds the allowable momentary power interruption time. (Example 2) *5. Even if the trip retry operation is selected, the Inverter trips if the cause of the trip is not remedied after the retry wait time (b003) elapses. In this case, increase the retry wait time. *6. Even if the retry operation is selected, the Inverter trips when undervoltage remains for 40 seconds or longer. *7.
If frequency matching start or frequency pull-in restart is selected for retry operation, the Inverter abruptly restarts at power-on, by alarm reset or retry start. •Below is the timing chart for frequency matching start (retry selection b001 = 02). t0: Momentary power interruption time t1: Allowable momentary power interruption time (b002) t2: Retry wait time (b003) (Example 1) Duration of momentary power interruption (Example 2) Duration of momentary power interruption > Allowable duration of momentary power interruption (b002) Power supply Power supply Inverter output Inverter output Free running Free running Motor rpm Motor rpm 4-43 Parameter No.
Function name Data Default setting Unit b009 Undervoltage retry time selection 00: Restarts 16 times in the event of undervoltage 01: Restarts limitlessly in the event of undervoltage 0.0 b010 Overvoltage/ overcurrent retry time 1 to 3 Select the number of retry times in the event of overvoltage/overcurrent *5 3 Time b011 Trip retry wait time 0.3 to 100. Time before restart 1.0 s b028 Frequency pull-in restart level 0.20 × Rated current to 2.00 × Rated current:
Current limit level at frequency pull-in restart Rated current A b029 Frequency pull-in restart parameter 0.10 to 30.00 Frequency reduction time at frequency pull-in restart 0.50 s b030 Starting frequency at frequency pull-in restart 00: Frequency at interruption 01: Max. frequency 02: Set frequency 0.0 Related functions C021 to C025, C026 Fre t0 t1 t2 t0 t1