Omron 3G3RX User Manual page 162

4-2 Function Mode
Parameter No.
Active Frequency
b028 Matching restart
level
Active Frequency
b029 Matching restart
parameter
Starting frequency
at Active
b030
Frequency
Matching restart
Related functions
4
*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 Active Frequency Matching 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).
Note that the Inverter switches, regardless of settings, to the initial state when the power supply is turned on in
the case of a complete power discharge.
t0: Momentary power interruption time
t1: Allowable momentary power interruption time (b002)
t2: Retry wait time (b003)
(Example 1)
Duration of momentary power interruption
< Allowable duration of momentary power interruption (b002)
Power supply
Inverter
output
Motor rpm
4-43
Function name
0.20 × Rated current to 2.00 × Rated current (0.4 to 55 kW)
0.20 × Rated current to 1.80 × Rated current (75 to 132 kW)
Current limit level at Active Frequency Matching restart
0.10 to 30.00
Frequency reduction time at Active Frequency
Matching restart
00: Off FQ (Frequency at interruption)
01: Max.FQ (Max. Frequency)
02: Set FQ (Set Frequency)
Free running
t0 t2
t1
Data
C021 to C025, C026
(Example 2)
Duration of momentary power interruption
> Allowable duration of momentary power interruption (b002)
Power supply
Inverter
output
Motor rpm
t1
Default setting Unit
Rated current A
0.50 s

00
Free running
t0